Best surge protector in transfer switches and surge protection
A compact Type 1 whole-home surge device, 80 kA per phase, UL 1449 and cUL listed and described as CSA rated, that an electrician mounts at any brand of panel.
Our score: 7.9/10 out of 10Researched, not lab-tested
- Device
- Surge protector, Type 1
- Surge current
- 80 kA
- Short-circuit rating (SCCR)
- 25 kA
- Voltage protection rating, L-N
- 600 V
Is it right for you?
Pros
- UL 1449 4th edition Type 1 and cUL; Schneider calls it CSA rated
- 80 kA surge current per phase
- Outdoor-rated NEMA 4X housing, -40 to 149 °F
- Green LED shows it is still protecting
Cons
- Hardwired at the panel: an electrician's job
- No audible alarm or remote contacts: only an LED shows failure
- Schneider's page states both 5 years and 18 months of warranty
- 120/240 V single phase only
- Best for
- Any 120/240 V single-phase home, Canadian ones included, that wants protection for hardwired appliances and electronics from lightning and grid switching surges.
- Not for
- Three-phase services, DIY installers, or anyone expecting it to replace plug-in protectors for sensitive electronics.
Our verdict
The HEPD80 is the straightforward whole-home surge protector for a 120/240 V single-phase house. Schneider Electric lists it as a Type 1 device to UL 1449 4th edition and cUL, and describes it as CSA rated, which makes it one of the few devices in our backup-power section with a Canadian mark stated by its maker. A Canadian electrical supplier sells it.
It is rated for 80 kA of surge current per phase, with a 25 kA short-circuit current rating and voltage protection ratings of 600 V line to neutral and line to ground. The NEMA 4X housing is rated for -40 to 149 °F, so it can mount outdoors, and it works with any brand of panel through 34 in leads. A green LED stays lit while it is protecting.
There is no audible alarm and no remote contacts, so a dead device shows only as an unlit LED you may not see. Schneider’s own page gives two warranty terms, five years in the description and 18 months in the spec table.
Setup and safety
This is electrician work. A whole-home surge device is wired into the panel or service equipment, which means working in a live panel. Have a licensed electrician fit it, and don’t open the panel yourself.
Why it helps. Lightning and grid switching send short voltage spikes into the house wiring. Owners on home-improvement forums generally think a panel-mounted device is worth having when it is installed with short leads, and still use plug-in protectors for sensitive electronics. Leviton notes that the 2020 US National Electrical Code (230.67) requires a Type 1 or Type 2 surge device on services supplying homes.
Checking it. Look at the green LED now and then, for example when you test smoke alarms. If it is off, Schneider says the device is no longer protecting and should be checked by an electrician.
Specs
Square D HEPD80 Whole House Surge Protective Device (Type 1, 80kA)
Installation
| Device | Surge protector, Type 1 |
|---|---|
| Needs a licensed electrician | Yes |
| Enclosure | NEMA 4X |
Surge protection
| Surge current | 80 kA |
|---|---|
| Short-circuit rating (SCCR) | 25 kA |
| Voltage protection rating, L-N | 600 V |
Other details
| Safety listing | UL 1449 4th ed. Type 1, cUL, CSA rated (per Schneider Electric) |
|---|
Maker’s figures, checked 3 Nov 2026.
HEPD80 questions
Does the HEPD80 work with any panel brand?
Yes. It is a separate device wired to the load centre with 34 in of 14 AWG leads, not a plug-in breaker, so it can sit beside any brand of panel. It suits 120/240 V single-phase, three-wire services, which covers most detached homes; three-phase services need a different model.
Is it approved for use in Canada?
Schneider Electric lists it as cUL listed and describes it as CSA rated, alongside its UL 1449 Type 1 listing. Your electrician should check the marks on the device. A Canadian electrical supplier sells it.
Do I still need plug-in surge protectors?
For computers and TVs, many owners keep them. A whole-home device at the panel takes the big incoming surges; a point-of-use strip adds a second, closer layer for sensitive electronics.
What warranty does it have?
Schneider Electric’s page is inconsistent: its description mentions five years, while its spec table says 18 months. Ask the seller or Schneider which applies before you buy, and keep the receipt and your electrician’s invoice.