PowerMax PMTS-50 50 Amp Automatic RV Transfer Switch — 120/220Vac, 20s Delay, Corrosion-Resistant Enclosure

The PowerMax PMTS-50 is a 50-amp automatic transfer switch that safely and seamlessly shifts RV power between two 110/220Vac sources and a single 110/220Vac output.

The PMTS-50 is engineered for recreational vehicles and mobile installations that need reliable, code-friendly switching between utility, generator, or inverter feeds. Built to replace the common IOTA50R, this compact automatic transfer switch handles 120/220Vac at 60 Hz with a 20-second time delay to prevent false transfers and protect sensitive electronics. Its corrosion-resistant enclosure and five knockout holes simplify installation in panel compartments or service bays.

How does the PMTS-50 manage two power sources without disrupting RV systems?

The PMTS-50 constantly monitors both 110/220Vac inputs and automatically selects the appropriate feed based on availability and stability. When a primary feed drops or returns, the unit delays transfer for up to 20 seconds to avoid nuisance switching from temporary dips.

• Automatic sensing of two AC inputs and a single output
• 20-second time delay on transfer to prevent rapid cycling
• Seamless switching suitable for generators, shore power, and inverters
• Designed for 50A service to support full RV electrical loads

What are the technical specs and compatibility considerations?

This transfer switch is rated for 50 amps and supports both 120V and 240V configurations at 60 Hz, making it compatible with the majority of North American RV electrical systems. It replaces IOTA50R-style units and fits typical enclosure cutouts while providing accessible knockout holes for conduit routing.

• Rated at 50 Amp service for high-demand RV circuits
• Operates on 120/220Vac at 60 Hz for dual-voltage systems
• Five knockout holes for flexible wiring and conduit entry
• Physical form-factor suitable for many standard RV electrical panels

How is the PMTS-50 installed and maintained?

Installation should be performed by a qualified electrician or RV technician to meet local electrical codes. The unit’s enclosure and knockout pattern make mounting straightforward; wiring follows normal transfer switch conventions for two inputs and one output. Routine checks of connections and proper torque help ensure reliable operation over time.

• Mount into service compartment with provided knockouts
• Wire two AC inputs and one output per wiring diagram
• Verify correct grounding and conductor sizing for 50A service
• Periodic inspection of terminals and enclosure for corrosion

What safety and performance features prevent damage to RV appliances?

The PMTS-50’s primary safeguards are its delayed transfer logic and robust 50A rating. The 20-second on/off delay prevents switching during brief voltage fluctuations, reducing stress on compressors and electronics. The unit’s durable construction and compliance with standard practices help maintain steady power delivery.

• 20-second delay reduces risk of fridge or AC cycling from transient drops
• 50A capacity supports high-draw appliances without overheating
• Solid-state switching and secure terminal connections for performance
• Replacement compatibility with known IOTA50R units

Who is this for: The PowerMax PMTS-50 is aimed at RV owners, fleet operators, and mobile-home technicians who need a reliable automatic transfer solution capable of handling full 50-amp RV services. It’s especially useful for those replacing older IOTA50R units, installing generator/shore power changeover systems, or upgrading inverter-based setups that require automatic, delay-protected switching. If you want a compact, installer-friendly transfer switch built for 120/220Vac 60 Hz RV applications, the PMTS-50 meets those operational and safety needs without unnecessary complexity.