OSRAM SYLVANIA T77U031 Three-Phase Electrical Contactor

OSRAM SYLVANIA T77U031 Three-Phase Electrical Contactor is a 3-pole, open-type motor-contactor in Bulletin 7707 TM form (coil designation E88) designed for three-phase circuits up to 600 VAC. The model label specifies a 30 A, 600 VAC rating for this device, while common T77U031 configurations list a continuous current around 27 A with coil voltages of 110–120 VAC at 60 Hz or 110 VAC at 50 Hz. As a NEMA Size 1 contactor, it often includes a single normally open auxiliary contact in many TM variants and is built to switch small-to-medium three-phase motors in industrial equipment such as conveyors, pumps, and fans; horsepower ratings include about 7.5 HP at 200–230 VAC and about 10 HP at 460–575 VAC. Some sub-variants, like T77U031-76, are described as non-reversing and open-type TM contactors, suitable for motor-control systems requiring a single-direction start/stop arrangement.