Square D Surgelogic Surge Prot...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$9,522.80
Square D Surgelogic Surge Protective Device, 500kA 208Y/120V 3-Phase 4-Wire

Square D Surgelogic Surge Protective Device, 500kA 208Y/120V 3-Phase 4-Wire

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Model: EMD25

In Stock (leaves warehouse same day if ordered before 3pm ET)

$9,522.80
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Square D Surgelogic Surge Protective Device, 500kA 208Y/120V 3-Phase 4-Wire, UL Type 1

The Square D Surgelogic surge protective device delivers 500 kA surge current protection for 208Y/120 V 3 phase 4 wire electrical systems. This UL Type 1 SPD is tested to UL 1283 C and is built for external mounting, giving installers convenient access for retrofitting and maintenance without modifying internal panel configurations. Housed in a steel enclosure and rated for a 150 V maximum continuous operating voltage (Uc), it is engineered for dependable transient voltage protection in commercial and industrial power distribution systems.

Key Features

  • Surge Current Rating: 500 kA surge current with a 20 kA nominal discharge current and 15 kA impulse current (Iimp) for robust transient suppression.
  • Rated Operational Voltage: 208Y/120 V AC (Ue) for 3 phase 4 wire systems.
  • Maximum Continuous Operating Voltage: 150 V (Uc) for reliable steady-state performance.
  • Durable Construction: Steel enclosure suited for external mounting and long-term durability.
  • Provided Equipment: Alarm enable/disable switch, switch-disconnector with integrated off/on/automatic switch, and surge counter for at-a-glance monitoring.
  • Local Signalling: Green status LED per phase for normal operation and red status LED per phase for fault indication.
  • Connection Terminals: Lugs terminal accepting AWG 8...AWG 1/0 conductors.
  • Operating Environment: Rated for -20-65 °C ambient operating temperature and an operating altitude of 0...12000 ft.

Certifications & Compliance

  • UL Type 1, Tested to UL 1283 C
  • UL 1449: ed. 5
  • UL 96A
  • CSA C22.2 No 269.1
  • Mercury Free
  • RoHS EU: Compliant with Exemptions

Technical Specifications

  • Take Back: No
  • Returnability: Yes
  • Sustainable Packaging: No
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: No
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Legacy WEEE Scope: In
  • Packaging Made With Recycled Cardboard: No
  • With Recycled Cardboard: No
  • Without Single Use Plastic: No
  • ROHS Exemption Information: Yes
  • Uc Maximum Continuous Operating Voltage: 150 V
  • China ROHS In Scope: No
  • Short Circuit Protection: 200 kA
  • Ambient Air Temperature For Operation: -20-65 °C

Typical Applications

  • Commercial and Industrial Electrical Panels
  • Retrofit Surge Protection Installations
  • 208Y/120V 3-Phase 4-Wire Power Distribution Systems
  • Externally Mounted Panelboard Protection
  • Renovation and New Construction Electrical Systems

Why Square D?

Square D Surgelogic surge protective devices pair a durable steel enclosure with UL Type 1 listing and UL 1449 ed. 5 testing to deliver dependable transient voltage protection for demanding electrical systems. Local LED signalling, a surge counter, and an integrated switch-disconnector make monitoring straightforward, supporting reliable, code-compliant performance in professional electrical installations.

Manufacturer Resources

Product Specs

Product Type:
Surge Protective Device
Voltage Rating:
208Y/120V
Configuration:
3-Phase 4-Wire
Standards:
UL 1449
Series:
Surgelogic
Product Material:
Steel
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Surge Protection
Product Depth:
7.48 in
Product Height:
14.02 in
Product Width:
15.98 in

Square D EMD25 – Frequently Asked Questions

1) Will the Square D Surgelogic EMD25 work on a 480V system?
No. The EMD25 is built for 208Y/120V 3-phase 4-wire service only, with a 150V maximum continuous operating voltage (Uc) per phase. Putting it on a 480Y/277V or 240V delta system is a misapplication. For those voltages you need the Surgelogic model matched to that system voltage.
2) What wire size do the lugs on the Surgelogic EMD25 accept?
The terminal lugs take AWG 8 through AWG 1/0 conductors. That covers typical 30A to 60A feeder taps off a panelboard breaker. If your design calls for larger than 1/0, you'll need to transition down at a junction or reduce the conductor to land in the lug.
3) Can I add the Surgelogic EMD25 to an existing panelboard without rebuilding it?
Yes, that is the point of the external-mount design. It mounts outside the enclosure and feeds from a breaker in the existing panel, so no internal panel reconfiguration is required. That makes it a straightforward retrofit on an occupied building where you cannot swap out the distribution gear.
4) Is the Surgelogic EMD25 a UL Type 1 or Type 2 SPD, and does it need a breaker ahead of it?
It is a UL Type 1 device, tested to UL 1283 C and to UL 1449 ed. 5. A Type 1 SPD may be connected on the line side of the service disconnect without a dedicated overcurrent device, though it also carries an integrated switch-disconnector with off/on/automatic positions. Short circuit current rating is 200 kA, so it suits high available-fault commercial and industrial services.
5) Is the Eaton BRNSURGE10 a direct replacement for the Square D Surgelogic EMD25?
No. The Surgelogic EMD25 is an externally mounted surge protective device in a steel enclosure rated 208Y/120V for 3-phase 4-wire systems, with a 500 kA surge current rating, surge counter, integrated switch-disconnector and per-phase LED indication. The Eaton BRNSURGE10 is a two-pole 10 kA BR Series surge protective device that installs in BR load center breaker spaces. They serve different openings: the EMD25 mounts externally alongside a panel and covers all three phases plus neutral, while the BRNSURGE10 occupies two single-pole spaces in a BR panel.
6) I need surge protection but have no room inside the panelboard. Which option works?
The Square D Surgelogic EMD25 is built for external mounting, so it is wired alongside the panel rather than consuming internal breaker spaces, which also keeps the existing panel configuration intact on a retrofit. Its steel enclosure measures 15.98 in wide by 14.02 in high by 7.48 in deep, so confirm that wall space next to the panel. The Eaton BRPSURGE and BRNSURGE10 are both two-pole BR-type devices that mount in load center breaker spaces, so they require available poles inside the panel.
7) Does 500kA mean this blocks a 500,000 amp surge?
No. 500 kA is the surge current rating, the cumulative capacity of the device, and it is the number specifiers use to size an SPD for service-entrance duty. The repeatable performance numbers are a 20 kA nominal discharge current (In) and a 15 kA impulse current (Iimp). A 500 kA class device like this is what you put at the service or a main distribution panel, not at a branch panel or a single piece of equipment.
8) How do I tell if the surge protector has failed without opening the enclosure?
Each phase has its own status LED, green for normal and red for a fault, so a walkthrough tells you which phase lost protection. There is also a surge counter for logging events and an alarm enable/disable switch for sites where you do not want nuisance signalling. That per-phase indication is useful for MRO staff who need to document protection status rather than just see one combined light.
9) Can the Surgelogic EMD25 be installed in an unconditioned mechanical room or rooftop penthouse?
The ambient operating range is -20 to 65 degrees C and it is rated to 12,000 feet altitude, which covers unconditioned interior spaces and high-elevation sites. It is a UL Type 1 unit in a steel enclosure; nothing in its rating addresses outdoor wet-location or washdown use, so keep it indoors or under protected cover.
10) Does this surge protector meet lightning protection and Canadian requirements for an institutional spec?
The Surgelogic EMD25 lists to UL 1449 ed. 5, is tested to UL 1283 C, carries UL 96A for lightning protection components, and meets CSA C22.2 No. 269.1 for Canadian installations. It is also mercury free and RoHS EU compliant with exemptions, which matters on procurement checklists. Country of origin is Mexico.
11) What is the difference between the Eaton BRPSURGE and BRNSURGE10 if I am cross-shopping against the Square D Surgelogic EMD25?
Both Eaton units are two-pole BR-type surge protective devices that land in a BR load center: the BRPSURGE is a plug-on neutral version, and the BRNSURGE10 is a BR Series device rated 10 kA. The Square D Surgelogic EMD25 is a different class of device - an externally mounted SPD in a steel enclosure for 208Y/120V 3-phase 4-wire distribution, carrying a 500 kA surge rating with a surge counter and per-phase status LEDs. Choose by service type and mounting: breaker-space mounting inside a BR panel versus an external enclosure wired to a 3-phase panelboard.
12) Can I shut off the surge protector to test or service the panel?
Yes. The unit includes a switch-disconnector with an integrated off/on/automatic selector, so you can isolate the SPD locally without pulling the upstream feeder breaker. Combined with the alarm enable/disable switch, that lets a technician silence signalling and take the device out of service during commissioning or megger testing.
How fast can I get the Square D EMD25 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D EMD25 come with a warranty?
Absolutely. The Square D EMD25 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D EMD25?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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