SOLID ECS41BC Solid State Current Sensor

The ECS41BC Solid State Current Sensor is a 120 VAC isolated current sensor with a Form C (SPDT) output that provides a discrete switch signal when the sensed current crosses a user-set threshold. Part of the ECS series (SymCom/Littelfuse), this device operates from a 120 VAC supply and offers an adjustable trip point in the 2 to 20 A range, making it suitable for protecting motors, pumps and other AC loads in control panels. It features an isolated SPDT output that allows safe interfacing to PLCs or other low-voltage logic without sharing the load path. The ECS41BC also supports selectable over- or under-current sensing, enabling you to configure the relay action to suit your protection strategy. Common applications include motor protection, overload indication, and general current monitoring in 120 VAC distribution networks where a reliable, low-wear current-sensing solution is preferred. Key specifications verified by listings: Operating voltage 120 VAC; Adjustable trip point 2–20 A; Isolated SPDT/Form C output; selectable over/under-current sensing; ECS-series current-sensing device.