Hughes Power Watchdog 50A Gen I & Gen II EPO Parts Guide

Hughes Power Watchdog 50-amp surge protectors are available with or without automatic Emergency Power Off and in original Bluetooth or newer Bluetooth/Wi-Fi versions. A 50-amp RV service has two hot legs, so choose the correct 50-amp device and identify its generation before selecting a replacement surge module.

Parts pictured in this guide

Select an image for product details, or jump to the parts list. Match the complete model and part number before ordering.

Hughes Autoformers 50A Surge Protector – PWD50-EPO-H — Hughes Power Watchdog 50A Gen I & Gen II EPO Parts GuideHughes Autoformers 50A Surge Protector – PWD50-EPO-HPart PWD50-EPO-H
Hughes Autoformers 50A Hardwired Surge Protector – PWD50EPOHW — Hughes Power Watchdog 50A Gen I & Gen II EPO Parts GuideHughes Autoformers 50A Hardwired Surge Protector – PWD50EPOHWPart PWD50EPOHW
Hughes Auto Surge Protection Module – RSP-50-PWD — Hughes Power Watchdog 50A Gen I & Gen II EPO Parts GuideHughes Auto Surge Protection Module – RSP-50-PWDPart RSP-50-PWD

Compare the 50-amp Power Watchdog models

Model on unit Generation / mounting Automatic shutoff? Replacement surge module
PWD50 Gen I portable, Bluetooth No RSP-50-PWD
PWD50-EPO Gen I portable, Bluetooth Yes — EPO SP50PWDEPO
PWD50-EPO-H Gen I hardwired, Bluetooth Yes — EPO SP50PWDEPO
PWD50W Gen II portable, Bluetooth and Wi-Fi No RSM50W
PWD50EPOW Gen II portable, Bluetooth and Wi-Fi Yes — EPO RSM50W
PWD50EPOHW Gen II hardwired, Bluetooth and Wi-Fi Yes — EPO RSM50W

Choose the 50-amp surge protection module

Module part Correct protector models Not interchangeable with
RSP-50-PWD Gen I PWD50 without EPO Gen I EPO, Gen II Wi-Fi and all 30A models
SP50PWDEPO Gen I PWD50-EPO and PWD50-EPO-H Gen I basic PWD50, Gen II Wi-Fi and all 30A models
RSM50W Gen II PWD50W, PWD50EPOW, PWD50EPOHW All Gen I models and 30A modules

50-amp shore-power monitoring

The EPO-equipped models monitor incoming power faults, interrupt unsafe power and ordinarily allow reconnection after conditions stabilize. The non-EPO versions provide surge protection and status monitoring but do not automatically disconnect the coach for low or high voltage. The manufacturer identifies a depleted surge module by an E9 code on EPO and Gen II displays, or by the dedicated surge-status indicators on Gen I non-EPO units.

Before ordering or replacing a part

The replacement module must match the exact 50-amp model, its EPO function and its generation. A PWD50-EPO-H is a first-generation hardwired product; PWD50EPOHW is a second-generation Wi-Fi product with a different surge module. Use only a 50-amp unit on a compatible RV electrical service, and check the wiring plan and grounding with a qualified installer. A surge protector is not a voltage booster.

Manufacturer documentation

Hughes 50A Gen I EPO module and compatible modelsHughes 50A Gen II Wi-Fi module compatibilityHughes 50A basic Gen I replacement moduleHughes Power Watchdog FAQs and diagnosticsHughes current 30A/50A lineup

Related Power Watchdog guides

See the matching products

Choose an image to open the corresponding NewRVParts product. The item number on your protector determines the correct service part.

Hughes PWD50 Power Watchdog 50A Gen I Portable Surge Protector product photographPWD50 — Power Watchdog 50A Gen I Portable Surge ProtectorGen I 50A model without automatic disconnectHughes PWD50-EPO Power Watchdog 50A Gen I Portable EPO product photographPWD50-EPO — Power Watchdog 50A Gen I Portable EPOGen I with Bluetooth and emergency shutoffHughes PWD50W Power Watchdog 50A Gen II Wi-Fi Portable product photographPWD50W — Power Watchdog 50A Gen II Wi-Fi PortableGen II 50A monitoring without EPOHughes PWD50EPOW Power Watchdog 50A Gen II Wi-Fi Portable EPO product photographPWD50EPOW — Power Watchdog 50A Gen II Wi-Fi Portable EPOGen II 50A portable EPO unitHughes SP50PWDEPO Gen I 50A EPO Replacement Surge Module product photographSP50PWDEPO — Gen I 50A EPO Replacement Surge ModuleFor Gen I PWD50-EPO and PWD50-EPO-HHughes RSM50W Gen II 50A Wi-Fi Replacement Surge Module product photographRSM50W — Gen II 50A Wi-Fi Replacement Surge ModuleGen II 50A PWD50W, PWD50EPOW, PWD50EPOHW

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