Sylvania T77U031 Contactor

The Sylvania T77U031 is a 3‑pole AC magnetic contactor from the Joslyn Clark/Sylvania TM family (Bulletin 7707 TM), designed for motor control in three‑phase industrial circuits. It is a NEMA Size 1, open, non‑reversing contactor rated for up to 30 A and up to 600 V AC, making it suitable for starting and protecting small to mid‑size three‑phase motors and other AC loads. The model designation T77U031 denotes a specific configuration within the TM series; variants of the same family carry different coil voltages, with a 120 V AC coil example listed for T77U031 in available catalogs. Typical applications include controlling three‑phase motors, pumps, fans, conveyors, and other equipment in industrial control panels, switchgear, and motor starters where a compact, non‑reversing open‑type contactor is required. This legacy device blends rugged Joslyn Clark coil technology with Sylvania branding, offering straightforward switching and reliable operation in legacy or replacement‑part scenarios where TM‑series contactors are specified.