Available in 120 Vac, 240 Vac, and 24 Vdc models with DPDT relay and 10 A dry contacts, Series 685A features optimized sensitivity adjustment, enabling users to better control trip level and maximize protection of equipment. Switches utilize spring-loaded, magnetically coupled sensor, which requires no power. Available with hazardous area approvals, devices are suitable for cooling towers, fin fans, large exhaust and vent fans, HVAC systems, blowers, and motors.