Description
The Littelfuse LLC44B30A Liquid Level Control Relay provides dependable, single-probe liquid level sensing for a wide range of HVAC and industrial applications. Powered by 120VAC, this relay employs resistance-based sensing technology to accurately detect the presence or absence of conductive liquids — automatically controlling connected pumps or triggering alarms as needed.
Adjustable sensitivity allows the relay to compensate for challenging conditions such as foam, turbulence, or debris, minimizing false readings and ensuring consistent, accurate level detection. The built-in fixed time delay of approximately 30 seconds prevents rapid short-cycling of connected equipment, protecting pump motors and extending overall system service life.
With its octal 8-pin plug-in design, the LLC44B30A installs quickly and can be replaced without rewiring — reducing downtime and simplifying maintenance. The SPDT isolated relay output provides flexible control options to suit a variety of system configurations.
Typical applications include sump pump systems, condensate management tanks, water treatment facilities, and general fluid level monitoring.
Key Features
- Single-probe liquid level sensing for simplified wiring and installation
- 120VAC operating voltage for standard commercial and industrial compatibility
- Built-in ~30-second time delay prevents rapid cycling and protects connected equipment
- Adjustable sensitivity accommodates varying liquid conductivity levels and turbulent conditions
- SPDT isolated relay output delivers flexible pump or alarm control
- Octal 8-pin plug-in design enables fast, tool-free installation and replacement
- Ideal for sump pumps, condensate systems, water treatment, and fluid level management
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