APC by Schneider Electric Surgearrest Panelmount 480/277V 120KA/PH - PMG3XS-B

APC by Schneider Electric PMG3XS-B Panel-Mount Surge Suppressor

Overview

The APC by Schneider Electric PMG3XS-B is a hardwired, panel-mount surge suppressor engineered for three-phase 480/277V commercial and industrial electrical systems. With 120 kA of surge current capacity per phase, it's sized for the kind of transient events that destroy unprotected control panels, automation equipment, and sensitive electronics in industrial facilities, data centers, and large commercial buildings. If you're specifying protection for a 480V distribution panel feeding security infrastructure, building automation, or process control loads, the PMG3XS-B is the device to evaluate.

Unlike plug-in or point-of-use suppressors, the PMG3XS-B connects directly into the panel via a hard-wire 5-wire (3PH + N + G) connection — meaning it protects at the source, before transients propagate downstream to individual equipment branches. The unit covers spikes, noise, and surge on all three phases simultaneously, which matters in facilities where lightning, utility switching, or large motor loads generate transients across the full distribution system.

Key Features

• 120 kA Maximum Surge Current per Phase: This is the rated clamping capacity — the amount of surge energy the device can absorb without failing. At 120 kA/phase, this suppressor handles the high-energy transient events common in industrial and commercial 480V environments (utility switching, nearby lightning strikes). Undersized suppressors fail on first contact with these events; the PMG3XS-B is rated for repeated exposure.
• 480/277V Three-Phase Input and Output: Matched to North American 480V Wye distribution systems — the standard voltage for commercial HVAC, industrial motors, and large panel feeds. Both input and output are rated at 480V AC / 277V AC, covering the full phase-to-phase and phase-to-neutral voltages of this configuration. Verify your panel voltage before ordering; this is not a 120/208V device.
• Hard-Wire 5-Wire Connection (3PH + N + G): Installs directly into the panel's terminal block — no outlet or plug required. The 5-wire configuration (three phase conductors, neutral, and ground) provides complete protection across all current-carrying conductors. This is a licensed electrician installation; plan for panel downtime during commissioning.
• Spike, Noise, and Surge Protection: The PMG3XS-B addresses three distinct disturbance types on a single device. Spikes and surges are high-energy, short-duration transients (lightning, switching). Electrical noise is lower-amplitude, higher-frequency interference that corrupts control signals and communication buses. Combining all three in one panel-mount unit simplifies the protection design and reduces the number of devices to maintain.
• Panel-Mount Form Factor (6.00 × 12.44 × 14.00 in): At just over 14 inches deep, verify clearance inside the enclosure or external mounting space before installation. The panel-mount design keeps the suppressor physically close to the panel it protects, which reduces lead length and preserves clamping effectiveness — longer leads between a suppressor and the panel reduce its ability to clamp fast-rising transients.
• APC by Schneider Electric SurgeArrest Platform: Part of the broader APC by Schneider Electric power protection line, the PMG3XS-B is backed by the same platform approach used across the SurgeArrest family. This matters for facilities standardizing on a single vendor for UPS, surge, and power distribution — consistent replacement parts, documentation, and support structure.

Integration and Compatibility

The PMG3XS-B installs upstream of any 480/277V three-phase load — security camera systems fed from 480V panels, access control power supplies, building automation controllers, or industrial process equipment. It does not condition power or regulate voltage; it clamps transients. For equipment requiring voltage regulation or UPS backup, pair this suppressor with an appropriate uninterruptible power supply downstream. The hard-wire input requires a licensed electrician and proper overcurrent protection in the panel; consult the user manual for wire gauge and breaker sizing requirements. If your application involves lower-voltage distribution (120/208V), review other models in the surge protection category — the PMG3XS-B is specific to 480/277V Wye systems.

For facilities running power distribution units or downstream PDUs fed from 480V panels, installing the PMG3XS-B at the panel level provides the first layer of a multi-stage protection strategy — the panel suppressor handles the bulk energy, while point-of-use devices handle residual transients at the equipment level.

What's in the Box

• 1x APC SurgeArrest PMG3XS-B Surge Suppressor (PMG3XS-B, often searched as PMG3XS B)
• 1x User Manual

Frequently Asked Questions

Q: What voltage system is the PMG3XS-B designed for?

A: The PMG3XS-B is rated for 480/277V AC three-phase Wye systems — the standard 480V commercial and industrial distribution configuration in North America. It is not compatible with 120/208V or single-phase systems.

Q: What is the maximum surge current rating on the PMG3XS-B?

A: The PMG3XS-B is rated at 120 kA maximum surge current per phase. This represents the peak transient current the device can absorb without failure.

Q: Does the PMG3XS-B require a licensed electrician to install?

A: Yes. The PMG3XS-B uses a hard-wire 5-wire (3PH + N + G) connection and installs directly into a 480V distribution panel. This is a panel-level hardwired installation that requires a licensed electrician and appropriate panel downtime.

Q: What types of electrical disturbances does the PMG3XS-B protect against?

A: The PMG3XS-B protects against spikes, electrical noise, and surges — covering both high-energy transient events (lightning, utility switching) and lower-amplitude noise that can corrupt control signals and communications equipment.

Q: Can the PMG3XS-B be used as a UPS or voltage regulator?

A: No. The PMG3XS-B is a surge suppressor only — it clamps transient overvoltages but does not provide battery backup, voltage regulation, or power conditioning. For those functions, pair it with a separate UPS downstream.

Q: What are the physical dimensions of the PMG3XS-B?

A: The PMG3XS-B measures 6.00 × 12.44 × 14.00 inches. Verify enclosure or mounting clearance — particularly the 14-inch depth — before ordering for a specific panel installation.

Ted Perry

The PMG3XS-B sits at the entry point of a 480/277V three-phase distribution system and absorbs surge events before they reach downstream equipment. That 120 kA/phase rating is the number that matters in commercial and industrial settings — it's high enough to handle the repeat transient events that wear down undersized suppressors and eventually let damaging voltages through.

Technical Highlights:

• 120 kA/Phase Surge Capacity: Sized for industrial-grade transient events. Most light commercial suppressors top out at 40–80 kA; the PMG3XS-B's 120 kA rating provides meaningful headroom for facilities near utility switchgear, with large motor loads, or in lightning-exposed regions.
• 480/277V Hard-Wire Input: The 5-wire (3PH + N + G) connection covers every current-carrying conductor in a Wye distribution panel — no phase is left unprotected. This is not achievable with plug-in devices at 480V; panel-mount hardwire is the only practical approach at this voltage level.
• Spike + Noise + Surge Coverage: Three protection modes in one device. Electrical noise suppression matters specifically for panels feeding control systems and communication equipment — noise on the power bus translates directly to corrupted RS-485 signals, false sensor readings, and access control misbehavior.

Deployment Considerations:

• At 14 inches deep, measure your panel enclosure or external mounting space carefully before ordering — this is not a compact device, and many retrofit enclosures have less clearance than the spec implies.
• The PMG3XS-B protects at the panel level only. It does not eliminate the need for point-of-use protection on sensitive equipment; for 480V-fed systems with downstream 120/208V distribution, a multi-stage protection approach (panel suppressor + equipment-level suppressor) is standard practice.

The PMG3XS-B is the right specification for 480V commercial facilities where the distribution panel feeds security, automation, or process control equipment — manufacturing floors, large commercial buildings, and data center power distribution panels where a single surge event on an unprotected 480V bus can take down an entire equipment rack.