Progressive Industries offers two different levels of RV shore-power protection: SSP portable surge protectors that identify pedestal wiring problems, and EMS electrical-management systems that monitor voltage and disconnect power during specified faults. Both are sold in 30-amp and 50-amp versions, with portable and permanently installed EMS options. Use this illustrated comparison to find the appropriate model family before ordering.
Surge indicator or active electrical protection?
The three paths below describe the parts' roles, not an installation sequence. All connect with the RV's appropriate rated shore-power system, but they react to faults differently.
SSP: portable surge guard
EMS-PT: portable management
EMS-HW: hardwired management
Choose 30-amp or 50-amp by the RV's electrical service
30-amp RV shore power is normally 120V with a dedicated TT-30 connection; 50-amp RV shore power is commonly a 120/240V split-leg supply with a different connector. These are not simply two interchangeable plug sizes. Match the RV inlet, power cord and product's service rating, and never use an adapter to assume additional available amperage.
Progressive's published surge ratings are 825 joules for SSP-30X and 1,650 joules for SSP-50X. The EMS-PT and EMS-HW families shown here are rated 1,790 joules for 30A and 3,580 joules for 50A. Joule ratings describe surge-energy absorption, not how much sustained electrical load an RV may draw.
The portable EMS models monitor high and low voltage, wiring faults and AC frequency, and incorporate a restart delay. The hardwired EMS-HW models perform related protection functions inside the vehicle, with a separate remote display. Hardwired equipment needs qualified electrical installation; this guide deliberately does not provide wiring instructions.
Progressive Industries model-number comparison
| MPN | Rated shore supply | Format | Surge rating | View product |
|---|---|---|---|---|
| SSP-30X | 30A · 120V | Portable surge protector | 825 J | Model photo |
| SSP-50X | 50A · 120/240V | Portable surge protector | 1,650 J | Model photo |
| EMS-PT30X | 30A · 120V | Portable electrical management | 1,790 J | Model photo |
| EMS-PT50X | 50A · 120/240V | Portable electrical management | 3,580 J | Model photo |
| EMS-HW30C | 30A · 120V | Hardwired electrical management | 1,790 J | Model photo |
| EMS-HW50C | 50A · 120/240V | Hardwired electrical management | 3,580 J | Model photo |
SSP and EMS product names can be similar on store shelves. Confirm the full MPN before ordering; suffixes identify separate products and not automatically compatible replaceable parts.
Compare the exact product photos
These product cards link to individual NewRVParts listings so you can compare the model markings and current availability. Products ship from supplier warehouses and are not available for in-person viewing or pickup.
Related RV electrical reference diagrams
Surge protection works alongside the RV's inlet, transfer switch and breaker panel. The related guides identify these other components and explain why their functions are different.
Model documentation
These distinctions are based on the manufacturer's SSP and EMS product comparisons. For electrical specifications, fault-code behaviour, placement and installation approval, refer to the current Progressive Industries instructions supplied for the exact model.