Proportional Thermostats provide low voltage, 3-wire control for valve motors, damper motors, and balancing relays in heating or cooling system applications. Features: Bellows element adjusts potentiometer slider to regulate motor operation. Removable setting knob prevents unauthorized tampering with setpoint.135 Ohm, Proportional Thermostat with auxiliary switch that closes on temperature rise, 56 F to 84 F.
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