Surge protection
The best surge protector for an EV charger
The charger and the car on the end of it are two of the most expensive electronics you own, connected to the grid for hours every night. A whole-home surge protector covers both.
By Sawyer V. · Published September 10, 2026
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This is an accessory nobody asks about until something fails. A home charger is a sophisticated electronic device wired to your panel, and it connects to an even more expensive one -- your car -- for hours every night. A surge arriving through the utility supply reaches both.
Why at the panel, not a strip
A hardwired 240-volt charger has nothing to plug into a strip. And even a plug-in charger should never run through a power strip or surge-protecting extension: they are not rated for a continuous high-current load. Why. Whole-home protection sits at the panel and covers every circuit at once.
How to read the ratings
| Rating | What it means | Better is |
|---|---|---|
| Type 1 / Type 2 | Type 2 installs on the load side of the main breaker; Type 1 can go on either side of the main disconnect | Either suits a home; Type 1 gives more placement options |
| Surge current (kA) | How large a surge it can divert | Higher |
| Clamping voltage / VPR | How much voltage gets through before it acts | Lower |
| SCCR | Fault current it can withstand safely | At or above your service's available fault current |
| NEMA 4 / 4X | A watertight enclosure; 4X adds corrosion resistance | Matters if it is mounted outdoors |
The three, side by side
| Siemens FS140 | Eaton CHSPT2ULTRA | Square D HEPD80 | |
|---|---|---|---|
| Type | Type 2 | Type 2 | Type 1 |
| Surge current | 140 kA per phase | 108 kA per phase | 80 kA per phase |
| Enclosure | NEMA 4X | NEMA 4 | NEMA 4X |
| Warranty, as published | 10 years | Lifetime limited, up to $75,000 connected-equipment coverage | 5 years, $75,000 connected-equipment coverage |
Practical points
- One is enough. If your panel already has a whole-home protector, a second adds nothing.
- It is electrician work, and a sensible thing to add on the same visit as a charger installation.
- Mount it close to the panel with short leads -- the installer will know why.
The surge protectors in detail
Three whole-home units, each with the case against it.
1. Highest surge rating
Siemens FS140 whole-home surge protector
Siemens · Panel-mounted
The highest surge-current rating of the three here at 140 kA per phase, in a NEMA 4X enclosure. Mounted at the panel, it protects every circuit in the house -- the EV charger included.
What is good
- 140 kA per phase, the highest rating here
- Three status indicators, including an audible alarm
- NEMA 4X enclosure, rated for outdoor mounting
- Protects every circuit, not just the charger
What is not
- Installation is licensed electrical work
- No surge protector is a guarantee against every event
- Overkill if a lower-rated unit covers your service
| Type | Type 2 surge protective device |
|---|---|
| Surge current | 140 kA per phase |
| Breaker | 30 A or smaller, 2-pole |
| System | 120/240 V, 60 Hz split-phase |
| Status indicators | Audible alarm, protection LED, service LED |
| Enclosure | NEMA 4X, outdoor-rated |
| Warranty | 10 years, as published |
Skip this if: Skip it if you already have a whole-home surge protector at your panel. One is enough; a second adds nothing.
Specifications above are the manufacturer’s published figures. Source: Crosswyre Electric. We have not tested this unit — see how we pick.
2. Longest warranty
Eaton CHSPT2ULTRA whole-home surge protector
Eaton · Panel-mounted
108 kA per phase, fits any manufacturer's load center, and carries the longest published warranty of the three: lifetime limited, with up to $75,000 of connected-equipment coverage.
What is good
- The longest published warranty here, with connected-equipment coverage
- 108 kA per phase
- Fits any manufacturer's load center
What is not
- Lower surge-current rating than the Siemens FS140
- Installation is licensed electrical work
- No surge protector is a guarantee against every event
| Type | Type 2 surge protective device |
|---|---|
| Surge current | 108 kA per phase |
| Compatibility | Any manufacturer's load center |
| Status indicator | LED |
| Enclosure | NEMA 4 |
| Warranty | Lifetime limited, up to $75,000 connected-equipment coverage |
Skip this if: Skip it if you already have a whole-home surge protector installed at your panel.
Specifications above are the manufacturer’s published figures. Source: Crosswyre Electric. We have not tested this unit — see how we pick.
3. Type 1 placement
Square D HEPD80 whole-home surge protector
Square D (Schneider Electric) · Panel-mounted
The only Type 1 unit here, so it can be installed on either side of the main disconnect -- including ahead of the main breaker -- which gives your electrician more placement options. 80 kA per phase in a NEMA 4X enclosure.
What is good
- Type 1, so it can go ahead of the main breaker as well as after it
- NEMA 4X, resistant to corrosion and water
- A real step up from no whole-home protection
What is not
- Lowest surge rating of the three at 80 kA per phase
- Shortest published warranty of the three
- Installation is licensed electrical work
| Type | Type 1 surge protective device, UL 1449 3rd Edition |
|---|---|
| Surge current | 80 kA per phase |
| System | 120/240 V single-phase |
| Placement | Either side of the main disconnect |
| Status indicator | Green LED |
| Enclosure | NEMA 4X, indoor or outdoor |
| Warranty | 5 years, $75,000 connected-equipment coverage |
Skip this if: Skip it if you want the highest surge-current rating available. The Siemens FS140 publishes 140 kA per phase.
Specifications above are the manufacturer’s published figures. Source: Crosswyre Electric. We have not tested this unit — see how we pick.
What we would do
If you have nothing at the panel now, add one when the charger goes in. The Siemens FS140 publishes the highest surge rating here. The Eaton carries the longest published warranty. The Square D HEPD80 is the Type 1 option, which gives your electrician the most freedom over where it goes.
FAQ
Questions people actually ask
Do I need a surge protector for my EV charger?
Can I plug my EV charger into a surge protector strip?
What kA rating do I need for a whole-home surge protector?
Sources
Where these numbers come from
- Best whole house surge protectors of 2026 — Crosswyre ElectricType, surge current, enclosure and warranty for all three units, the FS140's indicators and breaker size, and the HEPD80's Type 1 listing. Fetched 2026-09-10.
Read next
Related reading
- EV charger warranties, comparedPublished warranty terms side by side, what they typically exclude, and why it matters here.
- Is home EV charging safe?The real risks in home charging, the things that are not risks, and the habits that matter.
- Hiring an electrician for your EV chargerThe questions to ask, what a comparable quote contains, and the red flags.
- EV charger accessories: worth it, or skip itWhich EV accessories earn their place, which are situational, and which to skip.