Industrial LLC44B1A Liquid Level Control Relay

Littelfuse LLC44B1A Liquid Level Control Relay is a 120 VAC control relay in the LLC4 family that automates liquid-fill tasks in tanks and vessels. It drives a connected valve or pump based on sensed liquid level, allowing the system to refill to a set point and then stop. Verified specifications include a 120 VAC input and a relay output; time delay is adjustable through the sense resistor, with a resistance range specified as 1–250 kΩ. Distributor listings label the part as a Liquid Level Control / Box, signaling its packaging as a control module ready for integration into control circuits. Common applications include industrial tank and reservoir filling, sump level management, and other liquid-handling processes where a programmed delay reduces cycling and prevents premature valve operation. The LLC4 series encompasses related models with different timing and sensing options, such as LLC44A1A and LLC44B2A, illustrating the family’s configurable approach to level-control tasks.