Protection Relays Current Monitoring Relays and Transducers LSR-XXX SERIES Load sensor Description The LSR-xxx Series load sensors use current levels to determine feed rates, tool wear, loss of prime on pumps, mixer viscosity and all types of overload and underload conditions. They may also be used to stage pump motors, chillers and other machinery. These devices combine a current transformer (CT) with Form C (SPDT) relay contacts to switch alarm circuits, contactors or any resistive or inductive load. One simple screwdriver adjustment will calibrate the sensor for all singlephase or 3-phase applications up to 100hp. Features Wiring Diagram TYPICAL WIRING DIAGRAM FOR LOAD LOSS DETECTION TYPICAL WIRING DIAGRAM FOR OVERLOAD DETECTION g Can monitor current of motors up to 100Hp g Fine adjustment with 20-turn pot g Status LEDs Specifications Functional Characteristics Isolation Current Adjustment Range (Typical) Current Adjustment Range (Min-Max) Trip Setpoint Input Characteristics Control Power: LSR-24 LSR-115 LSR-230 Max Current Ratings Output Characteristics Output Contact Rating (SPDT): Pilot Duty General Purpose General Characteristics Temperature Range Wire Size Hole Size Terminal Torque Safety Marks CSA, CSA-NRTL/C CE Dimensions Weight Mounting Method Ordering Information MODEL LINE VOTAGE LSR-24 24VAC LSR-115 115VAC LSR-230 230VAC (c) 2016 Littelfuse Protection Relays & Controls www.littelfuse.com/lsrxxx 600VAC rms 2-100A 0.5-135A Adjustable to 1% range 24VAC 115VAC 230VAC 135A max. continuous 480VA @ 240VAC 10A -20 to 70C (-4 to 158F) #12-24AWG 0.725" diameter 7 in.-lbs. (File #46510) IEC 60947 H 42.42 mm (1.67"); W 58.42 mm (2.3"); D 90.43 mm (3.56") 0.4 lb. (6.4 oz., 181.44 g) Four #6 screws 3/4" in length Caution: This product should not be relied upon solely for safety of life or safety applications. Rev: 1-A-062716