Portable EMS, 30 A
Progressive Industries EMS-PT30X 30 Amp Portable RV EMS Surge Protector
The portable 30 A electrical management system that cuts power to the RV on low voltage, high voltage, reverse polarity, open ground, open neutral, bad frequency or an accidental 240 V pedestal — and scrolls the readings and error codes on its own display.
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Best for
Any 30 A RV that moves between campgrounds — the one unit to own if you buy only one
Specifications
| Service | 30 A, 120 V (3,600 W) |
|---|---|
| Surge protection | 3-mode (L-N, L-G, N-G); 1,790 J; 44,000 A; response < 1 ns |
| Low voltage | Shuts off below 104 V held for 6 s (error E 4) |
| High voltage | Shuts off above 132 V after 3 s; above 140 V after 1 s; above 156 V within 60 ms (E 3) |
| Wiring faults | Reverse polarity (E 1), open ground (E 2) and open neutral: power is never applied; accidental 240 V: instant shutdown |
| Frequency | Shuts off below 51 Hz (E 8) or above 69 Hz (E 7) |
| Reconnect delay | 2 min 16 s (136 s) after a fault clears, to protect the A/C compressor; 6 s start-up check on a clean pedestal |
| Surge-module status | E 10 when the surge protection is used up — power stays on, unit should be replaced |
| Display | Scrolls voltage, current, frequency, error code and previous error code every 2 s |
| Weather | Weather resistant (not submersible); use upright, not on the ground |
| Security | Built-in locking bracket for a cable lock |
| Warranty | Limited Lifetime (Progressive Industries) |
Specifications as published by Progressive Industries. Confirm against the current spec sheet before buying — manufacturers revise models without renaming them.
What's good
- A true EMS: it disconnects the RV on every pedestal fault our intro lists, not just surges — low voltage, the one that quietly kills A/C compressors, included
- Tells you what went wrong: an error code for each fault and a 'previous error' memory, so a trip overnight isn't a mystery in the morning
- The 136-second reconnect delay protects the air conditioner's compressor from a hard restart after a brownout
- Plug it into the pedestal first and read it before connecting the RV — the manual's own procedure for testing a site
What's not
- Shows an open-ground fault on a floating-neutral generator and refuses to pass power — correct behaviour, fixed with a bonding plug such as the Southwire 44400, never by bypassing the EMS
- Does not stop a surge from killing itself: once the surge module is spent (E 10) the unit still passes power, but with no surge protection until it is replaced
- Navico's site publishes the manual but no dimensions, weight or IP rating for the unit
- Limited Lifetime warranty terms are stated only on the manufacturer's warranty form, not on a product page
Our verdict
The portable EMS the others get compared to. Its thresholds are specific and conservative — off below 104 V, off above 132 V, faster the worse the overvoltage — and it refuses to energize a miswired pedestal at all. If your rig is 30 A, this is the unit. Pair it with a bonding plug if you also run a floating-neutral generator, and read the display before you plug the coach in.
Frequently asked questions
Compare with the alternatives
- Progressive Industries EMS-PT50X — 50 a rvs with two air conditioners, where a dropped leg or a low leg is the common campground problem
- Hughes Autoformers Power Watchdog Gen I – 30 Amp Surge Protector with Emergency Power Off – Portable (PWD30-EPO) — 30 a owners who want the pedestal readings on a phone inside the rv, and a surge module they can replace instead of the whole unit
- Southwire Surge Guard 34950 — 50A Portable Surge Guard with Enhancement, O/U, LCD, 50A 240V — 50 a rigs whose owners want a plain-english lcd readout and a lock ring on the cord, with a 30 a sibling (34930) for the smaller coach