Littelfuse ECSL40AC is a voltage and current sensing relay that can handle an output load rating of 10A resistive @ 240V, 1/4 hp @ 125V, and 1/2 hp @ 250V. It features 0.25 in. male quick connect terminals, with an input AC line frequency of 50/60Hz and a tolerance of -20% to 10%. It has a trip delay range of 0.150-7s, a response time of ≤75ms, and a current sensor range of maximum 50A turns/steady and 300A turns/inrush. It operates with peak detection using a toroid sensor and allows for over or undercurrent detection. The trip delay and trip point can be adjusted within specific ranges. With a sensor tolerance guaranteed range, the trip delay and trip point remain stable with temperature fluctuations. The Littelfuse ECSL40AC is a reliable sensing relay for various applications.