the SPDT (Single-Pole Double-Throw) configuration allows you to wire the thermostat to either break the circuit on temperature rise (heating) or make the circuit on temperature rise (cooling)

causing flames to "roll out" toward the burners instead of being pulled through the assembly

Enhanced System Safety: Provides a verified barrier against combustion bypass

Key Benefits Automatic Reset Logic: Eliminates the need for manual intervention by cycling the circuit back to closed once temperatures drop to 170°F

This Johnson Controls A70 series switch is a staple for contractors requiring a durable HVAC temperature controller that handles inductive loads without frequent contact fatigue or drift in calibration

Siemens Industrial Controls 3UB81334FW2 Relay 326058-755 the SPDT (Single-Pole Double-Throw) configurationThe Siemens 3UB81334FW2 is a high performance ESP200 solid state overload relay designed for demanding industrial motor protection. This 3 phase unit features a wide 13 52 amp full load amperage (FLA) adjustment range with a 4: 1 ratio, significantly reducing inventory requirements for contractors managing multiple motor sizes. Engineered to replace traditional bimetallic heaters, this electronic overload relay offers selectable trip classes (5, 10,