12.125" x 6" x 12.125", 480/277/240/120 VAC 50/60 Hz 1.17/2.06/2.41/4.66 A Primary, 24 VAC 4 A Secondary, 48.255/49.564/48.699/48.515 W, 500 VA Transformer, Overcurrent Protection Circuit Breaker, Enclosed with Low Voltage Compartment, AC Power Supply