Versatile Voltage Support: The 208-240V AC coil voltage provides compatibility with standard commercial and industrial power supplies

code-compliant solution for hot water space heating reliability

OEM Compatibility: Specifically designed as a Trane fan orifice to guarantee seamless integration with existing fan motors and blades

minimizing lockout cycles even in demanding high-demand environments

managing complex combustion sequences by regulating blower speeds and gas valve modulation

Neptronic AC2-B Auxiliary Switch 321894-708 Versatile Voltage Support: The 208-240VThe Neptronic AC2 B is a high performance auxiliary switch designed for seamless integration with Neptronic BT, BTM, and BTX series actuators. Built to handle double pole, double throw (DPDT) configurations, this unit provides precise remote status feedback and control for HVAC dampers and valve actuators. As the engineered replacement for the BT180 and compatible with BT160 footprints, it secures reliable end switch signaling within building