Southwire Surge Guard 44270
#9 in 50 ampFull review
The best surge rating per dollar among 50 amp protectors here. A good choice when the budget won’t stretch to an EMS.
Amazon $82.53$82.53
3.3/5
The standard hardwired EMS for 50 amp coaches at under $200. Best for owners who are happy to install it once and forget it.
- EMSType
- 3,580 JSurge rating
- HardwiredMount
Check price at Amazon$188.99
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Hidden inside the coach, so it can’t be stolen or left behind
- Cuts power on high or low voltage, miswiring and accidental 240 V
- 3,580 joules of surge absorption
Cons
- Installation means opening the shore power line
- No app or remote display in the box
The Progressive Industries EMS-HW family
Every Progressive Industries EMS-HW model we rank, smallest first. Ratings compare each against its own service.
| Model | Type | Rating | Price |
|---|---|---|---|
| Progressive Industries EMS-HW30C | EMS | 3.1/5 | $151.31 |
| Progressive Industries EMS-HW50C (this one) | EMS | 3.3/5 | $188.99 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its service. How we rank explains each one.
Specifications
| Model number | EMS-HW50C |
|---|---|
| Protection | |
| Service | 50 A |
| Type | EMS |
| Surge rating | 3,580 J |
| Miswiring detection | Yes |
| Build | |
| Mount | Hardwired |
| Display | Yes |
| App | No |
| Released | 2010-03-02 |
Alternatives in this service
Southwire Surge Guard 44290
#10 in 50 ampFull review
A high capacity 50 amp surge protector with more diagnostics than its price suggests. For coaches that don’t need voltage cutoff.
Amazon $77.99$77.99
Hughes Power Watchdog PWD50W
#12 in 50 ampFull review
A connected surge protector for 50 amp RVs that you can watch from anywhere. Buy the auto shutoff version if you want an EMS.
Amazon $249.99$249.99
Compare
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