Hoffman Controls 706-123SC 120/240/277V 15A Vari-Speed Fan Speed Controller

The Hoffman Controls 706-123SC (assembly sub-number 706-0155-070) is a Series 706 Vari-Speed solid-state SCR fan motor speed controller designed for single-phase AC induction fan motors. It operates at multiple input voltages — 120V, 240V, or 277V AC — at 15 amps continuous, making it compatible with a wide range of HVAC, refrigeration condenser fan, and industrial ventilation applications. The controller features an adjustable minimum speed limit (via the front-panel "Minimum Limit Adj" potentiometer) that prevents motor stall at low speed settings, and the heavy-duty anodized aluminum heat sink with dual fin arrays provides passive thermal management without the need for forced cooling. This new-in-box unit ships with the original product data sheet covering the 706-123S and 706-4S series, and includes pre-wired red and black lead wires for straightforward field installation; UL listed per visible Underwriters Laboratories mark on the control module.

Product Specifications