Square D 2959-S1-W33A Electromagnetic Relay Coil

Square D 2959-S1-W33A is an electromagnetic coil (magnet coil) engineered to energize Square D’s 2959-series relays and timer modules used in industrial control panels, providing a 120 VAC coil voltage that triggers the relay when power is applied. This is the genuine replacement coil, also cataloged as L2959-S1-W33A; distributors and aftermarket sellers commonly list it as the compatible coil for the 2959 S1 family, with the W33A suffix designating this specific variant. The coil is a plug‑in magnet coil that interfaces with the corresponding 2959 relay contact assembly to control circuit paths by closing or opening contacts as energization occurs, making it a fundamental component in Square D/NEMA automation schemes within Schneider Electric’s Square D portfolio. In practice, technicians specify the 2959-S1-W33A coil when refurbishing or maintaining control panels that rely on 2959-series relays, ensuring consistent actuation and compatibility with other Square D components in the same product family.