Normally Open Relays

Normally open OptoMOS® solid state relays make highly efficient and reliable options for keeping circuits open. Unlike electromechanical relays, these semiconductor assemblies contain no moving parts. This prevents fatigue and failure while also providing space and weight savings. Littelfuse makes one-pole, dual-pole, voltage-controlled, and dc-only normally open relays. We also offer relays with two MOSFETs and relays with built-in protection against voltage surges. You will find our OptoMOS relays in data acquisition devices, industrial control modules, medical equipment, meters, and security systems.