Joslyn Clark T77U021 Contactor

Joslyn Clark T77U021 Contactor is a 30 A, 3-pole motor-contactor in a NEMA Size 1 package with a 110/120 VAC coil, widely used in industrial control panels to switch 3-phase motors and other line-voltage loads. This Sylvania-branded unit belongs to Joslyn Clark's T77 family and is designed for reliable energize/de-energize cycles in routine start/stop applications. The coil voltage—110/120 VAC—supports standard low-voltage control circuits, allowing direct interfacing with typical pushbuttons, pilot relays, or programmable logic controllers. The T77U021 variant is specified as a 3-pole device with a current rating of 30 amperes, suitable for energizing small to mid-size motors and similar loads in light to medium-duty service. Included in many listings is a normally open (NO) control circuit contact, enabling straightforward integration into common control schemes without needing additional adapters. As a legacy component, the T77U021 is frequently sought for refurbishment, replacement, or upgrade in equipment that originally used Joslyn Clark/Sylvania contactors.