The T-57 automatic transfer switch orchestrates changeover between shore power and a generator for 30 or 50-amp RV electrical service at 120/240 volts. DC coil relays eliminate AC chatter and prevent voltage dropout; break-before-make design avoids power crossover or arcing. A built-in time delay allows the generator to complete self-diagnostics before the switch activates. Steel enclosure (9-1/4 x 5-1/8 x 8-1/4 inches) mounts flat and provides generous internal wiring space. Limited 2-year warranty.

• 50-amp automatic transfer switch (30 or 50-amp service)
• 120/240-volt operation
• DC coil eliminates chatter and dropout
• Break-before-make relay prevents arcing
• Built-in generator diagnostics delay
• Floor mount, ample wiring space