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