Parallax | 50 Amp Transfer Switch | ATS503

Take the hassle and risk out of switching between shore power and generator power with the Parallax ATS503 50 Amp Automatic Transfer Switch. Designed specifically for 50 amp, 120V electrical systems, this transfer switch automatically routes power between your two sources, so you never have to handle plugs, swap cords, or fumble with breakers when switching power on the road.

Reliable, Automatic Power Transfer

The ATS503 is the most trusted way to transfer power between shoreline and RV generators, automatically detecting the active source and routing it to your RV's electrical system. The result is seamless, safe transitions whether you're firing up the generator at a boondocking site or plugging into the pedestal after pulling into a campground.

Built to Industry Standards

Constructed from UL Type 1-16 gauge steel and conforming to UL Std. 1008 (CSA C222 #178.AEI), the ATS503 is built to the safety standards you want when handling 50 amps of power in your rig. The compact design makes installation manageable in tight RV equipment bays.

Key Features

• 50 amp automatic transfer switch
• Designed for 50A, 120V RV electrical systems
• Automatic transfer — no plug or cord handling needed
• Conforms to UL Std. 1008 (CSA C222 #178.AEI)
• UL Type 1-16 gauge steel construction
• Compact design for easy installation
• Ideal for RV, marine, and similar applications
• Backed by a 2-year manufacturer warranty

Specifications

• Brand: Parallax
• Model: ATS503
• Rating: 50 amp, 120V
• Construction: UL Type 1-16 gauge steel
• Compliance: UL Std. 1008 (CSA C222 #178.AEI)