Hughes Autoformer | Replacement 50 Amp Surge Module | RSM50W | Fits: Power Watchdog PWD50EPOW / PWD50EPOHW / PWD50W
Hughes Power Watchdog Gen II 50A Replacement Surge Module (RSM50W)
Fits: Power Watchdog PWD50EPOW / PWD50EPOHW / PWD50W (Gen II WiFi Units)
Product Overview
The Hughes Autoformer RSM50W Replacement Surge Module is a direct-fit, field-replaceable surge protection component designed specifically for 50 Amp Power Watchdog Gen II (WiFi) surge protectors. This module restores full surge protection functionality after a surge event, allowing users to extend the life of their Power Watchdog without replacing the entire unit.
Engineered as a sacrificial surge protection device, the RSM50W absorbs damaging voltage spikes and electrical surges before they reach your RV’s sensitive electronics and appliances. Once depleted, the module can be quickly replaced, minimizing downtime and reducing replacement costs.
Key Features
- Direct OEM replacement for Hughes Power Watchdog Gen II units
- Sacrificial surge module design protects RV electrical systems from high-voltage events
- Plug-and-play installation – no soldering required
- Restores full surge protection capability after a surge event
- Heavy-duty internal components engineered for RV and outdoor electrical environments
- Cost-effective alternative to replacing the entire surge protector
Technical Specifications
| Specification | Details |
|---|---|
| Part Number | RSM50W |
| Amperage Rating | 50 Amp |
| Compatibility | PWD50EPOW / PWD50EPOHW / PWD50W (Gen II WiFi models) |
| Generation | Gen II (WiFi / EPO models only) |
| Surge Protection Rating | ~4,800–6,100 Joules* |
| Electrical System | 120/240V AC, 50A RV service |
| Installation Method | Internal slide-in module |
| Tools Required | Phillips screwdriver |
| Connection Type | Hardwired internal terminals (L1, L2, N, G) |
| Reusability | Replaceable after surge event |
| Material | High-temp PCB with integrated MOV protection components |
| Application | RV surge protection systems |
*Joule rating varies slightly depending on model configuration and production revision.
Compatibility & Fitment
Designed exclusively for:
- Power Watchdog PWD50EPOW (Portable, WiFi, EPO)
- Power Watchdog PWD50EPOHW (Hardwired, WiFi, EPO)
- Power Watchdog PWD50W (Gen II WiFi models)
⚠️ Not compatible with Gen I (non-WiFi) units
Installation Overview
Simple installation! The only tool required is a Phillips screw driver.
Make sure unit is unplugged before installation!
INSTRUCTIONS
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UNPLUG THE UNIT - make sure unit is fully disconnected from power prior to installation.
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Unscrew 6 Phillips screws on the back of the unit
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7 screws for the EPO versions
-
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Unscrew the top cable gland nut and move it up the cord.
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The surge module slides in/out of the slot. Unclip the one red/black wire, and loosen the screws holding the fork wire connectors to the wire leads.
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Unplug the old surge module from the unit.
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Connectthe new surge protection module and wires. "G" is ground and green color, "N" is neutral and white color, "L
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Replace all the screws and re-tighten the cable gland nuts.
Installation is typically completed in 10–15 minutes with basic tools.
How It Works
The RSM50W uses metal oxide varistor (MOV) technology to detect and absorb excess voltage. During a surge event:
- The module diverts excess energy away from your RV
- Internal components sacrifice themselves to protect downstream systems
- The module can then be replaced to restore protection
- Replacement for tripped or depleted Hughes Power Watchdog surge protection modules
The Hughes RSM50W is a critical service component that allows Power Watchdog owners to quickly and affordably restore surge protection without replacing the entire unit—making it an essential maintenance item for any 50A RV electrical system.
