APC by Schneider Electric Surgerarrest Panelmount 208/120V 120KA with Surge Counter - PMF3S-A

APC by Schneider Electric PMF3S-A Panel Mount Surge Protector 208/120V 3-Phase 120kA

Overview

The APC by Schneider Electric PMF3S-A is a hardwired, three-phase panel-mount surge protective device rated for 208/120V AC systems with a 120,000A maximum spike current capacity. It is engineered for permanent installation in commercial and industrial electrical panels where downstream equipment — building management systems, security infrastructure, industrial controls, or IT distribution — needs protection from transient overvoltages. The gray steel enclosure ships in a 12-inch form factor and carries both NEMA Type 12 (dust-tight, indoor) and NEMA Type 3R (rainproof, outdoor) ratings, making it deployable in a wide range of mechanical room and outdoor cabinet environments without a separate housing upgrade.

If you are specifying APC by Schneider Electric power protection for a facility, the PMF3S-A sits in the panel-mount surge protection category alongside whole-building and point-of-use options — the right layer when you need protection at the service entrance or sub-panel feeding critical loads.

Key Features

• 120,000A Max Spike Current: The 120kA per-phase clamping capacity means the PMF3S-A can absorb a direct lightning-coupled transient or a large utility switching event without failing open — critical when the downstream load is a building automation controller or a multi-camera NVR stack that cannot tolerate an unprotected surge event.
• 1ns Surge Response Time: A 1-nanosecond response is effectively instantaneous relative to the rise time of most real-world transients (typically 8/20µs waveforms). The clamp engages before the surge reaches downstream equipment, not after it has already passed through.
• 30dB EMI/RFI Noise Filtration: Beyond suppressing discrete spikes, the PMF3S-A attenuates conducted EMI/RFI noise by 30dB. For sensitive analog or IP-based surveillance equipment sharing a panel with motor loads, VFDs, or HVAC compressors, this noise floor reduction directly reduces false triggers, image artifacts, and communication errors on connected devices.
• Hardwire 5-Wire Input (3PH + N + G): The unit connects directly to the panel via a five-wire hardwire termination — three phase conductors, neutral, and ground. There are no plug-in connectors to loosen or corrode over time, and the installation is permanent and tamper-resistant once landed.
• NEMA Type 12 and NEMA Type 3R Enclosure: Dual NEMA ratings give you flexibility at the installation site. Type 12 covers indoor locations with dust, falling dirt, and dripping non-corrosive liquids. Type 3R adds protection from rain, sleet, and external ice formation — meaning this unit can live in an outdoor disconnect cabinet, a rooftop electrical closet, or a parking structure panel without an additional weatherproof enclosure.
• Audible Alarm: An onboard audible alarm activates when the surge protection module is degraded or has sacrificed itself absorbing a significant event. This matters in unmanned mechanical rooms or remote panels — you will know the device needs attention without having to physically inspect the enclosure on a scheduled basis.
• Surge Counter: The built-in surge counter logs cumulative surge events. For power protection planning and maintenance scheduling, this data tells you how hard the site's electrical environment actually is, whether the current SPD rating is adequate, and when a replacement evaluation is warranted.
• UL 1449 and UL 1283 Listed: UL 1449 is the governing standard for surge protective devices — listing here means the clamping and let-through voltage claims have been independently tested. UL 1283 covers electromagnetic interference filters. Both listings are required for specification into commercial construction projects and are commonly required by AHJs.
• 10-Year Limited Warranty: A decade of manufacturer warranty coverage on a hardwired panel-mount device is meaningful — it spans multiple equipment refresh cycles for the protected loads and aligns with typical commercial electrical infrastructure lifespans.
• 50/60Hz Compatible: Operates on both 50Hz and 60Hz systems, so the same SKU covers North American 60Hz facilities and 50Hz international or generator-fed applications without substitution.
• Operating Temperature to 149°F / 0–95% Humidity: The 149°F (65°C) upper operating limit and 0–95% non-condensing humidity range accommodate hot electrical rooms, rooftop enclosures, and subtropical climates without thermal derating concerns in most real-world installations.

Integration & Compatibility

The PMF3S-A installs at the panel level upstream of branch circuit breakers — not at individual outlet or equipment level. It protects everything downstream of its installation point, making it the right choice for sub-panels feeding PoE network switches, NVR racks, access control power supplies, and building automation equipment. Because it uses a hardwire 5-wire connection, the installing electrician must land it during panel work; it is not a field-swap device for end users. Compliance with cUL, UL 1449, UL 1283, and NEMA Type 12/3R means it satisfies the electrical code requirements for surge protection in most commercial and industrial jurisdictions in North America. Confirm local AHJ requirements before specification if the installation is in a classified or hazardous location — NEMA Type 12/3R does not cover explosion-proof or hazardous area applications.

Frequently Asked Questions

Q: What input voltage and phase configuration does the PMF3S-A support?

A: The PMF3S-A is rated for AC 120/208V, three-phase input, 50/60Hz. It connects via a hardwire 5-wire termination (3PH + N + G). It is not compatible with single-phase panels or 240/480V three-phase systems.

Q: What is the maximum surge current rating of the PMF3S-A?

A: The PMF3S-A carries a 120,000A (120kA) maximum spike current rating. This represents the peak surge current the device is designed to divert without failing, per UL 1449 test methodology.

Q: Does the PMF3S-A work outdoors or only indoors?

A: It carries both NEMA Type 12 (indoor, dust/drip resistant) and NEMA Type 3R (outdoor, rainproof) ratings. It can be installed in outdoor disconnect cabinets or rooftop panels without an additional weatherproof enclosure, as long as the application does not require explosion-proof or hazardous-location ratings.

Q: What does the surge counter feature do?

A: The onboard surge counter tracks cumulative surge events experienced by the device. This log is useful for assessing site electrical environment severity, determining whether the installed SPD rating is adequate for the location, and scheduling replacement evaluations before the device is fully exhausted.

Q: What certifications does the PMF3S-A carry?

A: The PMF3S-A is listed to UL 1449 (surge protective devices), UL 1283 (electromagnetic interference filters), and cUL. It also carries NEMA Type 12 and NEMA Type 3R enclosure ratings. These listings satisfy the requirements for commercial construction specifications and AHJ approval in most North American jurisdictions.

Q: What is the warranty on the PMF3S-A?

A: APC by Schneider Electric covers the PMF3S-A with a 10-year limited warranty.

Marty Allison

When I spec the PMF3S-A for a commercial job, the number I keep coming back to is 120kA — that is a serious whole-building surge rating, not a desktop strip. At 19.18 lbs and a 12-inch enclosure, this is a panel-mount device landed by an electrician at the service entrance or critical sub-panel, not something a tech clips on after the fact.

Technical Highlights:

• 120kA Max Spike Current: Handles the full energy of a utility switching surge or a nearby lightning strike without sacrificing the MOV stack prematurely — important in facilities where the cost of a protected NVR or BAS controller far exceeds the cost of the SPD itself.
• 1ns Response Time: Faster than the rise time of any real-world transient waveform you will encounter. The clamp is engaged before the surge front reaches terminal equipment — not trailing it by microseconds.
• 30dB EMI/RFI Noise Filtration: In panels that share space with VFDs, HVAC compressors, or elevator motor drives, 30dB of conducted noise attenuation is the difference between clean IP camera feeds and intermittent dropped frames or CRC errors on your surveillance network.

Deployment Considerations:

• This is a hardwire-only installation — a licensed electrician must land the 5-wire (3PH + N + G) termination. Budget for electrical labor at commissioning; this is not a field-swappable device.
• NEMA 3R covers rain and external ice, but does NOT cover submersion, condensing moisture inside the enclosure, or hazardous/classified locations — verify your enclosure environment against the full NEMA rating matrix before specifying for washdown or explosion-proof applications.

The PMF3S-A (often searched as PMF3S A) is the right call for a commercial security or building automation sub-panel in a facility with significant motor load noise on the same electrical service — the combination of 120kA clamping and 30dB noise filtration addresses both the spike and the conducted interference problem in a single panel-mount device.