CONTROL TRANSFORMER, PRIMARY VOLTAGE: 550 575 600V, SECONDARY VOLTAGE: 110 115 120V, FREQUENCY: 50 60HZ, RATED POWER: 250VA, PHASE NUMBER: 1, NEMA ST-1, STANDARD: ROHS, ANSI, IEEE, CSA LR27533, UL CUL E46323 , UL LISTED 702X, ADDITIONAL FEATURES: SCREW TERMINALS, WEIGHT: 10.2LBS, REFERENCE: CUTLER HAMMER C0250E4CFB (EX 332 B635-A 21)