50 amp transfer switch. WFCO T57 T-57 50 Amp RV Trailer Power Center Automatic Transfer Switch Relay Camper Trailer RV The WFCO T-57 transfer switch is designed to provide trouble-free changeover of power between shore power and generator. This transfer switch is used for 30-amp or 50-amp AC service. The T-57 mounts easily onto a flat surface and is engineered for safe, reliable performance. The unit’s DC coil prevents AC “chatter” noise and drop-out in low-voltage conditions. Accidental coupling of power to or from shore line and generator is prevented by a “make before break” configuration. UL® and cUL®-Listed. FCC Class B Warranty period: 2-year warranty Input: 105-130 VAC, 60 Hz, 30-amp or 50-amp service Dimensions: 8.1” wide; 10.1” high; 5.5” deep