Old EMP trap in ARC Raiders: how it works and counter it

Old EMP trap in ARC Raiders: what it actually is

You have just looted a battered circuit crate in ARC Raiders when a heavy ARC machine rounds the corner, servos whining, sensors sweeping the room. The classic answer to that moment is a magnetic pulse trap, an item long enough in the game’s history that experienced players still call it the old EMP trap. It does not shoot, it rarely kills on its own, and it is one of the few tools that can temporarily turn a high-tier ARC into a sitting target. Understanding the old EMP trap means understanding how the game’s machines react to electronic interference, how the trap interacts with the world, and where it falls apart against a squad that knows what to expect.

This piece is written for players who already know the basics of ARC Raiders and want a focused look at this specific trap. It covers how the old EMP trap fits into the broader trap system, what it does to an ARC, where it shines, where it fails, and how to deploy it without catching the squad in its own radius.

The old EMP trap in ARC Raiders is a deployable piece of salvage equipment that emits a short electromagnetic pulse when triggered. It sits inside the game’s broader trap category, alongside proximity mines, detonator charges, and other field tools. Its defining feature is that it does not deal physical damage in the usual sense. It attacks the electronics of anything caught in its radius, with a strong bias toward ARC machines, the robotic enemies that patrol and guard the maps.

You will find the old EMP trap as a craftable or world-spawned item, and because it has been in the game long enough to earn the “old” prefix, it predates several of the more specialised trap variants introduced in later updates. It is a basic electromagnetic tool, not a high-tech superweapon, and that simplicity is what keeps it useful. When a squad needs a way to control the timing of an ARC engagement without committing to a full firefight, the old EMP trap is usually the cheapest, lightest option available.

In the wider context of ARC Raiders as an extraction shooter, traps form one of the loadout-defining layers of decision-making. Ammo is finite, healing is slow, and the map is full of both AI threats and rival players. The old EMP trap converts an ARC encounter from a reactive scramble into a planned window, which is why it has survived through the game’s updates as recognisable equipment rather than being replaced outright.

How the old EMP trap works mechanically

The trap has three distinct phases: deploy, arm, and trigger. Most failed uses of the old EMP trace back to a mistake in one of those three steps.

Deploy phase

When you place the trap, you commit to a fixed position. The old EMP trap is a static device, not a throwable grenade. You pick a surface, place it, and the trap latches onto that geometry. The placement animation is short, but it is not instant, and the character model is locked in place during the animation. You cannot place a trap while sprinting, while reloading, or while under direct fire, because the placement action will be interrupted.

Most players place the trap on a flat surface at roughly the height of an ARC’s chassis. That is not a hard rule, but it tends to give the most consistent trigger radius, because the pulse expands in a sphere around the device and the further the ARC’s electronic core sits from the center, the less effective the disable becomes.

Arm phase

After placement, the trap needs time to arm. During this window, the trap is not yet active and will not trigger. A common mistake is treating the arming delay as a tiny visual detail, then walking back over your own trap. The arming window is the trap’s most vulnerable moment, and any ARC, rival raider, or even a careless teammate can dismantle or destroy the trap during that period.

The arming window is short enough that you can usually finish repositioning to cover if you planned the placement well. It is long enough, however, that a trigger-happy squad will sometimes sprint through a door and ruin the trap before it ever arms. Treat the arming window as a small commitment, not a non-event.

Trigger and pulse

Once armed, the trap triggers when an eligible target crosses its detection radius. Detection is proximity-based, not line-of-sight-based. The trap does not need to see the target, but the target needs to be within a certain distance of the device. For ARCs, that radius is generous, because they are large and their internal servos already produce a strong electromagnetic signature. For rival raiders, detection is much tighter, which is one of the reasons the old EMP trap is treated as an anti-ARC tool first and an anti-player tool second.

When the trap fires, it releases a short electromagnetic pulse. ARCs caught in the pulse are temporarily disabled. Their movement systems, weapons, and many of their scripted behaviors shut down for a defined window. The disable is not a full stun in the visual sense, but the ARC stops firing, stops advancing, and in many cases enters a recovery animation while its systems reboot. For players, the effect is lighter: a short period of reduced HUD stability, some interference with electronic sights or deployable gadgets, but not a hard crowd-control effect.

What the old EMP trap does to ARC machines

The reason the old EMP trap matters at all in ARC Raiders is that ARC machines are the dominant threat on the map. They patrol, guard high-value loot, respond to noise, and in higher-tier zones they appear in numbers. The trap’s value is the time it buys you.

Disable window

When an ARC is caught by the pulse, it enters a disabled state for a short but meaningful window. During that window, an aggressive squad can reposition, throw damaging explosives, or land free shots on a stationary target. The disable is not permanent, and the ARC will recover on its own without external input. The trap does not deal damage, it only buys time.

The length of the disable window is short enough that hesitation costs you the trade. By the time the squad has finished reacting to the trap, the ARC is already starting to reboot. Plan the burst of damage in advance rather than improvising it on the spot.

Effect on targeting and aggression

A disabled ARC stops scanning. In a normal encounter, an ARC tracks movement, leans toward cover, and prioritises whoever is dealing the most damage. A disabled ARC loses that targeting logic. It is effectively a piece of scenery for the duration of the disable, and that loss of aggression is often more useful than the raw disable window, because it lets a squad stack damage from multiple angles without being punished by return fire.

Effect on different ARC classes

Not all ARCs respond to EMPs the same way. The old EMP trap is most reliable against light and medium ARC classes, which already rely heavily on exposed electronics. Heavier ARC classes, including some of the long-range and area-denial units, have more hardened systems and a shorter effective disable window. Against a fully upgraded heavy ARC, the old EMP trap is a nuisance, not a solution. The trap’s design assumes that you will use it as part of a layered plan, not as a solo answer to every machine on the map.

Where the old EMP trap fits in a loadout

The old EMP trap is not a primary weapon and not a healing item. It is a tool slot, and that slot is contested. You give up that slot knowing that you will rarely use the trap more than once or twice per raid, and only in specific scenarios. Loadouts that include the old EMP trap usually look very different from loadouts that ignore it.

Solo play

For a solo raider, the old EMP trap is a safety tool. It is the answer to a moment when an ARC has spotted you and the path to cover is not safe. The trap gives you a short window of safety in which to heal, reposition, or slip away. Solo players tend to place traps at choke points and doorways that they expect to retreat through, not at the front of an engagement. The trap is an exit plan, not an opening move.

Duo play

For a duo, the old EMP trap becomes a coordination tool. One player places, the other player lines up damage. The duo that uses the trap well has already decided, before the engagement, who is shooting which body part and for how long. The trap is a way to force an ARC to stop moving so that two players can apply pressure at the same time without exposing themselves.

Squad play

For a full squad, the old EMP trap is one ingredient in a larger plan. A coordinated squad will often combine the trap with a damage-dealing explosive, a smokescreen, or a pre-set firing position. The trap’s disable window is the cue for the squad to commit. Once the trap fires, the squad commits to the burst of damage and the follow-up rotation. A squad that waits too long for the “perfect” trap moment often finds the moment has already passed.

Where and when to place the old EMP trap

Placement is the single biggest factor in whether the trap does anything useful. A trap placed at random is a trap that triggers at random, and a trap that triggers at random is usually a trap that hurts the user more than the target.

Choke points and doorways

The most reliable placement is a narrow doorway, corridor, or staircase where an ARC has to pass close to the device. The trap’s proximity radius is generous against a unit forced through a small gap, and the ARC’s pathing usually gives you a predictable trigger point. Doorways are also the spots where rival squads are most likely to funnel during a retreat or a push, which gives the trap a second use case as an anti-player tool.

Near ARC spawns and patrol routes

Placing the trap directly on top of an ARC spawn is tempting but unreliable. ARCs do not always walk into the same spawn room, and a trap placed too obviously will often be avoided or destroyed by the ARC’s own patrol logic. The better placement is one step beyond the spawn, on the route the ARC is most likely to take on its first patrol cycle. That placement requires map knowledge, but it pays off far more often than a spawn-room placement.

Behind cover and retreat paths

The most underrated placement is on your own retreat path. Place the trap at the spot you expect to cross if the fight goes wrong. When an ARC pushes you, you fall back past the trap, the ARC follows, and the trap fires behind you. That kind of placement turns the trap into a panic button rather than an opening move, and it is the placement that saves the most runs in the long run.

Common mistakes when using the old EMP trap

Most failed uses of the old EMP trap come from a small set of recurring mistakes. None of them are complicated, but each one can turn the trap from a useful tool into dead weight.

Placing the trap in the open, where any rival squad can see it and dismantle it before it arms.
Treating the trap as a damage source, then being surprised when the ARC recovers without losing a meaningful chunk of health.
Forgetting the arming window and walking back over the trap during your own rotation.
Placing the trap on geometry that the ARC will not pass through, such as a wall or a ceiling beam.
Stacking the trap with too many other deployables in the same area, so that the squad cannot tell which tool is doing what.
Using the trap as a primary answer to a heavy ARC class that has hardened electronics, where the disable window is too short to matter.

Each of these mistakes is fixable. The fix is almost always a planning step before the placement, not a reaction after the placement.

Counterplay to the old EMP trap

Any experienced squad will think about counterplay the moment they see the trap’s silhouette. If you understand that counterplay, you will use the trap more honestly, and you will not be surprised when a competent squad turns your trick against you.

Detection and dismantling

The trap is visible to anyone who looks at the right piece of geometry. A careful squad will scan choke points before pushing, identify the trap’s faint tell, and either shoot it or step around it. The arming window is the squad’s chance to dismantle the trap, and most experienced players keep a small reserve of damage for exactly that case. If you place the trap in plain sight, you are giving that squad a free item.

EM shielding and resistance

Some higher-tier gear in ARC Raiders includes electromagnetic shielding, which reduces the duration and the effect of EMP pulses. A squad running that gear will treat your trap as a minor inconvenience rather than a tactical tool. The counter to that counterplay is either to commit to the engagement anyway, or to switch to a different trap type that does not rely on EMPs.

Spread and spacing

A squad that spreads out can sometimes step around the trap’s detection radius entirely, especially in wide rooms. The counter to that counterplay is to use the trap in narrow geometry where spacing is not an option, or to combine the trap with a damage-dealing tool that forces the squad to clump together.

Comparing the old EMP trap to other traps in ARC Raiders

The old EMP trap is one entry in a wider trap system, and its value depends on how it compares to the other options. The table below is a high-level comparison of the trap categories most players will encounter, based on their general role and behaviour in raids.

Trap	Primary target	Damage profile	Disable effect	Typical user
Old EMP trap	ARC machines, light electronics	None	Short disable window on ARCs, light HUD effect on players	Solo and squad players who need control over an ARC push
Proximity mine	Players, light ARCs	High burst	None	Defensive players guarding loot rooms or extract paths
Detonator charge	Fortified positions, heavy ARCs	Very high	Stagger only	Coordinated squads preparing a burst on a hardened target
Gas trap	Players in enclosed rooms	Damage over time	Sensory impairment	Aggressive players pushing a contested building
Tripwire alarm	Information, early warning	None	None	Solo players who want notice before a squad arrives

The old EMP trap is the only entry in that table whose primary effect is non-damaging disable rather than direct damage. That makes it complementary to the other traps rather than competing with them. A loadout that combines the old EMP trap with a single high-damage tool is often more flexible than a loadout that picks two damage tools and ignores control.

Quick reference: old EMP trap at a glance

For players who want a fast lookup before a raid, the table below condenses the trap’s key behaviour into a single block. Numbers and exact timers shift with patches, so treat the values as a working baseline rather than a permanent spec sheet.

Attribute	Behaviour
Item type	Deployable trap, tool slot
Placement	Static, latches to a surface, short placement animation
Arming window	Short delay between placement and activation, vulnerable to damage
Detection	Proximity-based, generous against ARCs, tight against players
Effect on ARCs	Short disable window, loss of targeting and aggression
Effect on players	Brief HUD instability, interference with electronic gadgets
Best ARC targets	Light and medium classes
Weak ARC targets	Heavy classes with hardened electronics
Best placements	Choke points, doorways, retreat paths
Worst placements	Open fields, walls, ceiling beams, extract zones
Main counter	Pre-push scanning, EM shielding, spread spacing

Keep that table open during your first few runs with the trap. After a dozen placements, the behaviour stops being something you read and starts being something you recognise.

How the old EMP trap interacts with the game’s broader systems

The old EMP trap does not exist in isolation. It interacts with ARC behavior, with player electronics, with environmental hazards, and with the extraction loop. A useful mental model is to think of the trap as a small piece of the game’s larger electronic ecosystem.

Interaction with ARC behavior

ARCs that are already alerted, already shooting, and already in pursuit are the most common trigger for the trap, because they are the units most likely to be in the trap’s detection radius at the right moment. ARCs that are still in patrol mode may not register the trap’s proximity trigger, depending on their patrol speed and the radius. A trap placed on a patrol route the ARC has already passed is a trap that has lost its main use case.

Interaction with player electronics

Players caught in the pulse do not take direct damage, but they do suffer a brief period of reduced HUD stability. That can interfere with aiming, with the use of electronic scopes, and with deployable gadgets. The effect is short, but in a close fight a one-second window of HUD interference is the difference between landing a shot and missing it.

Interaction with environmental hazards

Some of ARC Raiders’ map-specific hazards are electronic in nature. A trap placed near one of those hazards can produce unexpected chain effects, such as a disabled ARC walking into an electrified zone and taking collateral damage. That kind of chain effect is not something the player can rely on, but it is something an experienced raider learns to recognise when it happens.

Interaction with the extraction loop

The broader design of ARC Raiders as an extraction shooter rewards players who extract with high-value loot, and the whole pacing of a raid is built around that risk-and-reward pull. The old EMP trap is a tool that protects that loot by giving the squad time to clear the path to extract. It does not generate loot on its own, and it does not speed up the extract, but it removes a variable from the final stretch of the raid. In long raids, where fatigue and ammo scarcity are real factors, that variable removal is the trap’s real value. Background on how that extraction framing shapes moment-to-moment play is covered in an ARC Raiders impressions preview from Game Informer, which lays out the loop the trap plugs into.

Building a trap-first playstyle around the old EMP trap

Some players build their entire playstyle around traps, and the old EMP trap is usually the foundation of that style. A trap-first playstyle is not for every squad, but it has a real place in the game’s ecosystem.

Core principles

The core principle of a trap-first playstyle is that you decide the timing of every engagement, not the ARC. You choose where the fight starts, you choose when it starts, and you choose when it ends. The old EMP trap is the cheapest way to control that timing, and the rest of the loadout is built around supporting that control.

Loadout structure

A typical trap-first loadout for ARC Raiders uses the old EMP trap as the primary control tool, a single high-damage weapon as the cleanup tool, a small healing reserve, and a mobility tool to make the rotations between trap placements possible. The trap is the first item the player crafts or picks up, because without it the rest of the loadout has no anchor.

Movement and pacing

Trap-first players move more slowly than combat-first players. They stop at choke points, scan patrol routes, and place traps with intent. That slower pace is a feature, not a bug. It is what gives the trap the time it needs to arm and the placement it needs to trigger correctly. Players who try to combine trap-first placements with combat-first pacing often end up tripping their own traps.

Troubleshooting: when the old EMP trap does not work

Sometimes the old EMP trap simply does not fire, and sometimes it fires but does nothing. Both cases are diagnostic moments, not failures.

The trap did not trigger

If the trap did not trigger, the most common cause is placement geometry. The trap was placed on a wall, on a ceiling, or in a spot the ARC did not actually walk through. The second most common cause is that the trap was destroyed during the arming window, often by a rival squad or by your own squad’s area damage. The third most common cause is that the target never entered the detection radius, usually because the player misread the patrol route.

The trap triggered but did not disable

If the trap triggered but the ARC kept moving and shooting, the most common cause is that the target was a heavy ARC class with hardened electronics. The second most common cause is that the trap was placed too far from the ARC’s electronic core, so the pulse lost intensity. The third most common cause is that the trap was fired at an already-disabled ARC, which gives no additional effect.

The trap hurt your own squad

If the trap hurt your own squad, the most common cause is that the squad rotated through the trap’s radius during the arming window or after the trap had fired. The fix is a squad-level rule: nobody crosses the trap’s placement until the engagement is over or the trap has been dismantled on purpose. That kind of rule is what separates a squad that uses traps from a squad that suffers from them.

How to read an opponent who is using the old EMP trap against you

The flip side of using the trap well is recognising it when an opponent uses it against you. A few patterns repeat across skilled squads.

One player baits, another player places. If you see a teammate-style bait at a doorway, expect a trap on the other side.
The trap is almost never alone. A single trap usually comes with a damage tool, a smokescreen, or a pre-aimed line of fire. Plan for two tools, not one.
The trap’s placement is a tell about the squad’s plan. A trap at a retreat path means the squad is planning to fall back. A trap at an entrance means the squad is planning to hold a room.
The disable window is short. A squad that hesitates after the trap fires is a squad that has not practised the follow-up rotation.

Reading those tells does not make you immune to the trap, but it does give you the half-second of warning that often decides the engagement.

When not to use the old EMP trap

There are real situations where the old EMP trap is the wrong tool, and bringing it into those situations is a waste of a slot.

When the squad is pushing an open field with no choke points, where the trap’s detection radius is wasted.
When the squad is already deep into a firefight, because the arming window is longer than the time the squad can hold the line.
When the squad’s target is a heavy ARC class with hardened electronics, where the disable window is too short to matter.
When the squad is extracting with high-value loot, because a trap placed in the extract zone often blocks the squad’s own exit.
When the squad’s map knowledge is too thin to predict the ARC’s patrol route, because a wrongly placed trap is a trap that never triggers.

The honest answer to “should I bring the old EMP trap on this raid” is the same as the answer to most gear questions in extraction shooters: it depends on the map, the squad, and the plan. The trap is a tool, not a default.

Advanced patterns: combining the old EMP trap with the wider game loop

Once the basic mechanics of the old EMP trap are familiar, the next step is to combine the trap with the rest of the raid loop. The patterns below are the ones that show up most often in high-performing squads.

Trap then rotate

Place the trap at a choke point, then rotate the squad away from the choke point to a pre-set firing position. When the trap fires, the squad is already aimed and ready to apply damage. The trap is the cue, the firing position is the response, and the rotation in between is what most squads get wrong.

Trap then extract

Place the trap on the path between the squad and the extract point, then run for extract. If the squad is pursued, the pursuing ARC or rival squad walks into the trap, and the squad gains a short window of safety. That pattern is most useful in the final stretch of a raid, when the squad is heavy with loot and slow to fight.

Trap then disengage

Place the trap as a screen, then disengage. The trap is a deterrent as much as it is a damage tool, and a well-placed trap often convinces a pursuing squad to think twice. That kind of soft control is invisible on the kill feed, but it is the kind of control that decides long-term survival in extraction play.

How updates have changed the old EMP trap’s role

The “old” prefix on the EMP trap exists because the game has been updated, and the trap has been rebalanced alongside new content. The general pattern across the game’s history is that the old EMP trap has been kept as a baseline tool, with new specialised traps added on top rather than replacing it. That is a deliberate design choice, because a baseline tool is what most players can rely on while they are still learning the system.

That does not mean the trap has not changed. The disable window, the arming delay, the detection radius, and the visual appearance of the trap have all been tuned. Specific numbers change from patch to patch, and any squad that plans around a specific timer should re-validate that timer after each update. The role of the trap, however, has stayed consistent: a simple, cheap, reliable way to turn an ARC encounter from a reaction into a plan.

Players who treat the old EMP trap as a fixed piece of the game’s design are usually better at using it than players who treat it as a fixed piece of the game’s numbers. The role is stable, the numbers are not.

Final validation checklist for using the old EMP trap

Before you place the trap on a real raid, walk through the checklist below. It is the same checklist that experienced players internalise over dozens of runs, and it is the checklist that separates a useful placement from a wasted slot.

Confirm the engagement you are planning for. If you cannot describe the engagement in one sentence, the trap is not ready to be placed.
Confirm the geometry. The trap needs a choke point or a predictable patrol route, not an open field.
Confirm the arming window. Make sure you and your squad can clear the placement area before the trap arms.
Confirm the follow-up. The trap is a cue for the squad, not the end of the plan. Decide who is shooting, from where, and for how long.
Confirm the exit. The trap should not block the squad’s own retreat path, and it should not trap the squad in a dead end.
Confirm the counterplay. If the squad is running gear that ignores EMPs, swap to a different trap before placing.

A trap that passes all six checks is a trap that will almost certainly do useful work. A trap that fails any one of them is a trap that will probably cost the squad more than it gives back. For a wider read on how this kind of trap design fits into the game’s overall identity, the ARC Raiders Wikipedia entry covers the basics of the title and its extraction-shooter framing.

Frequently asked questions

Does the old EMP trap deal damage in ARC Raiders?

No. The old EMP trap does not deal direct damage to ARCs or to players. Its effect is a short disable window on ARC machines and a brief period of reduced HUD stability for players. Any damage the squad deals during that window comes from the squad’s weapons, not from the trap itself.

Is the old EMP trap worth a tool slot in a squad loadout?

It depends on the squad’s plan. For a squad that regularly engages ARC machines in narrow geometry, the trap is a strong pick because it converts a reactive fight into a planned one. For a squad that mostly avoids ARCs and focuses on rival players, the trap is a wasted slot, and a damage tool or a detection tool is a better use of the same space.

Can the old EMP trap disable a heavy ARC class?

It can, but the effect is much shorter than it is against light and medium classes. Heavier ARC units have more hardened electronics, so the disable window is too short to rely on for solo play. Against a heavy ARC, the trap is a cue for the squad to commit, not a tool to win the fight on its own.

Can a player dismantle the old EMP trap before it arms?

Yes. The trap is visible on placement, and during the arming window a rival squad or even a teammate can shoot it and destroy it. That is one of the reasons placement geometry matters: the trap is safest in spots the rival squad will not look at until it is too late.

Does the old EMP trap affect other deployables?

Yes, the pulse can interfere with electronic deployables in its radius, including some friendly gadgets. That is one of the reasons trap-first squads keep their deployable count low and their spacing generous. A trap that disables the squad’s own tools is a trap that has hurt the squad more than the target.

Where is the best place to put the old EMP trap on a typical map?

The best places are narrow choke points, doorways, and staircase landings where an ARC has to walk through a small space. Open fields and large rooms are weak placements because the trap’s detection radius is wasted. A retreat-path placement is a strong second choice for solo players who want the trap as a panic button.

Does the old EMP trap work in PvP as well as PvE?

It works against players, but the effect is much weaker. The pulse’s effect on a player is a brief period of reduced HUD stability, not a hard disable. Against a coordinated squad, the trap is a nuisance rather than a deciding factor, which is why the old EMP trap is treated as an anti-ARC tool first and an anti-player tool second.

How long does the disable window last on an ARC?

The exact duration is short, and it has been tuned across patches. The reliable approach is to plan the squad’s burst of damage in advance, because by the time the squad has reacted to the trap, the ARC is already starting its recovery. Treat the disable window as a cue, not a clock.

Should I bring the old EMP trap on a solo extract run?

For solo play, the trap is a useful safety tool, especially on maps with heavy ARC presence. It is not mandatory, and a solo player who is confident in their movement and aim can run other tools in that slot. The trap is most useful for solo players who already know they will be retreating through predictable paths.

What is the difference between the old EMP trap and newer EMP traps?

Newer EMP-style traps tend to have more specialised effects, such as longer disable windows, larger radii, or specific interactions with certain ARC classes. The old EMP trap is the baseline tool, with shorter effects but a more predictable behaviour. Most players keep the old trap in their loadout because they trust its behaviour even after the game’s balance changes.

Old EMP trap in ARC Raiders: how it works and how to counter it