Square D HEPD Whole House Surg...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$163.19
Square D HEPD Whole House Surge Protection Device, 120/240V, Type

Square D HEPD Whole House Surge Protection Device, 120/240V, Type

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Model: HEPD50

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

$163.19
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Square D HEPD Whole House Surge Protection Device, 50kA, 120/240V, Type 1

The Square D HEPD whole house surge protection device delivers AC surge protection for the entire electrical system in a home, guarding sensitive electronics and appliances from damaging voltage spikes. Rated for 120/240 V AC, 1 phase, 3-wire (isolated ground) service, this compact SPD Type 1 device provides 50 kA of surge current per phase with a 10 kA nominal discharge current, and is UL 1449 (4th edition, Type II) listed and cUL certified for dependable, code-compliant performance.

Key Features

  • Surge Current: 50 kA per phase for robust whole-house transient protection.
  • Rated Operational Voltage: 120/240 V AC, 1 phase, 3-wire (isolated ground) configuration.
  • Nominal Discharge Current: 10 kA for consistent surge suppression performance.
  • Maximum Continuous Operating Voltage (Uc): 150 V.
  • Short Circuit Protection: Rated to 25 kA.
  • Local Signalling: Single green LED indicates normal operation at a glance.
  • Enclosure Rating: NEMA 4X degree of protection for durability.
  • Compact Design: Space-saving footprint built to fit standard residential installations.

Certifications & Compliance

  • UL 1449, 4th Edition, Type II Listed
  • cUL Listed
  • SPD Type 1 Classification
  • RoHS EUR Compliant with Exemptions
  • Mercury Free

Technical Specifications

  • Sustainable Packaging: No
  • Mercury Free: Yes
  • Packaging Without Single Use Plastic: Yes
  • ROHS Eur In Scope: Yes
  • Recycled Metal Content At Cr Level: 0 %
  • Serviceability: No
  • China ROHS In Scope: No
  • Returnability: Yes
  • Country of Origin: Mexico
  • Device Type: Surge Protection and Power Conditioning - Surge Protection Devices
  • Wiring Configuration: 3-wire (isolated ground)
  • Nema Degree Of Protection: NEMA 4X
  • Market Segmentation: Residential

Typical Applications

  • Whole-House Residential Surge Protection
  • Panelboard and Load Center Installations
  • Protection of Home Electronics and Appliances
  • New Construction and Retrofit Electrical Upgrades
  • Residential Service Entrance Protection

Why Square D?

Square D HEPD surge protection devices are UL 1449 listed and cUL certified, reflecting a commitment to rigorous safety and performance standards for residential electrical systems. With mercury-free construction and a NEMA 4X-rated enclosure, this device is built to deliver reliable, code-compliant surge protection homeowners and electrical professionals can count on.

Manufacturer Resources

Product Specs

Voltage Rating:
120/240V
Department:
Electrical
Listing:
UL 1449
Product Type:
Surge Protection Device
Standards:
cUL
Country of Origin:
Mexico
Product Group:
Wiring Devices
Product Subgroup:
Whole House Surge Protectors

Square D HEPD50 – Frequently Asked Questions

1) What's the difference between the Square D HEPD50 and HEPD80 surge protector?
The difference is the surge current rating per phase. HEPD50 is the 50kA model, HEPD80 is the 80kA model. Both are the same HEPD whole house SPD platform on 120/240V service. Higher kA means more headroom for repeated transient events, which matters most on service entrances in lightning-prone areas or with overhead feeds. If you're standardizing across a portfolio of homes, pick one MPN and stay with it.
2) Will the Square D HEPD work on my 120/240V single phase residential panel?
Yes. The HEPD is rated 120/240 V AC, 1 phase, 3-wire with isolated ground, which is standard US residential service. It is not a three phase device, so don't spec it for 208Y/120 or 480V commercial gear.
3) Is the Square D HEPD a Type 1 or Type 2 surge protective device?
Both, in the way that matters on an inspection. The HEPD carries SPD Type 1 classification and is UL 1449 4th Edition listed as Type II. A Type 1 classification means it can be installed on the line side of the service disconnect, which is the flexibility most electricians want when the load center is already full.
4) How do I know if the Square D HEPD surge protector is still working?
There's a single green LED on the unit for local signalling. Green means normal operation. No green means the protection has degraded and the unit needs replacing. Worth noting for MRO and property maintenance crews: the device is listed as non-serviceable, so there are no replaceable modules or cartridges. When the LED goes out you swap the whole unit.
5) What is the difference between the Square D HEPD and the Bussmann BBU17 series surge protective device?
The Square D HEPD is a Type 1 SPD built for 120/240V AC, 1 phase, 3-wire (isolated ground) residential service, offered in 50 kA and 80 kA per phase surge current ratings, with a 10 kA nominal discharge current and a NEMA 4X enclosure. The Bussmann BBU17 series BSPD device is rated 120 kAIC and also carries a NEMA 4X enclosure. If the job is a single-family service entrance or load center on 120/240V single phase, the HEPD is sized and configured for that opening; the BBU17 is the higher short circuit rated option when the panel calls for it.
6) Can the Square D HEPD be mounted outside next to the meter?
The enclosure carries a NEMA 4X degree of protection, so it handles washdown, rain, and corrosion exposure. That covers an exterior service entrance mount beside the meter or main disconnect, not just an indoor basement panel.
7) Does the Square D HEPD need a breaker, or does it wire straight to the panel?
It is a hardwired, externally mounted SPD, not a plug-on breaker style unit. It lands on the 120/240V single phase, 3-wire isolated ground service, so you'll need two hot conductors, neutral, and ground plus whatever overcurrent protection your AHJ requires. Nothing plugs into a breaker slot, which is why it's a common pick when the load center has no spare spaces.
8) What is the short circuit current rating on the Square D HEPD?
25 kA short circuit current rating. That has to be at or above the available fault current at the point where you land it, so on a large service with a high AIC main, verify the utility fault current first. Nominal discharge current is 10 kA and maximum continuous operating voltage (Uc) is 150 V.
9) Can I add a whole house surge protector to an existing older panel, or only on new construction?
Both. The HEPD is used on new construction and on retrofit electrical upgrades, including service entrance protection on existing homes. Because it mounts externally rather than occupying breaker spaces, it retrofits onto a full load center without a panel change. What you do need is room to land it and access to the two hots, neutral, and ground.
10) Which whole house surge protector should I use if the panel is outdoors or in a wash-down area?
Both options are enclosed to NEMA 4X, so either suits a damp or outdoor-adjacent panel location. The Square D HEPD carries a NEMA 4X degree of protection along with UL 1449 listing and cUL certification, and the Bussmann BBU17 series BSPD is likewise a NEMA 4X device. Choose between them on the electrical side - service voltage and short circuit rating - rather than on the enclosure.
11) Is the Square D HEPD approved for use in Canada?
Yes, it's cUL certified in addition to its UL 1449 listing, so it's accepted on both sides of the border.
12) Does the Square D HEPD surge protector contain mercury or meet RoHS?
Mercury free, RoHS EUR compliant with exemptions, and shipped in packaging without single use plastic. Recycled metal content at the Cr level is 0 percent. Country of origin is Mexico. Those are the line items sustainable distributors and green building procurement teams typically get asked for.
How fast can I get the Square D HEPD50 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 HEPD50 come with a warranty?
Absolutely. The Square D HEPD50 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 HEPD50?
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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