Sylvania T77U021 is a 30 A, 3-pole, NEMA Size 1 electrical contactor with a 110–120 VAC coil, designed for DIN-rail mounting. It accommodates 230 VAC up to 7.5 hp and 460/575 VAC up to 70 hp, making it suitable for controlling small to mid-size three-phase motors. Coil voltages are 110–120 V at 60 Hz (and 110 V at 50 Hz). In catalogs, the same part is listed as Joslyn Clark T77U021 for 120 V coil, reflecting its use across the Sylvania/Joslyn Clark control line.
