LSR Series - Self-Powered Load Sensor/Proof Relay

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The LSR-0 is a self-powered load sensor intended for use as a proof relay. It is used to verify that current is flowing as intended. It has a guaranteed 15A pull-in current and 2.5A drop-out current. Proof relays are typically used to interlock fans, compressors, motors, heating elements and other devices. The LSR-0 is self-powered, that is, it draws its power from the wire being monitored so it does not require separate control power wiring.

Access specifications, certifications, check availability and order parts below

Catalog #Termination TypeMounting MethodDimensionsWeight (lbs/g)Input Current Range (A)Maximum Input PowerOutput Load Rating (VA)Sensor Hole SizeTrip Point RangeTurn-off Threshold (A)Turn-on Threshold (A)StockSamples
LSR-0Torque: 7 in.-lbs.; Wire: 12 - 24 AWGFour #6 screws 3/4 in in length1.67 H x 2.3 W x 3.56 D in. (42.4 x 58.4 x 90.4 mm)0 Kg0 - 135 continuousInduced from conductorPilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A0.725 in diameterInduced2.5 (min.)Fixed 15 (max.)CheckOrder
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