Schneider Electric (Viconics) R820-643 Control 321894-708 With a 370V electrical rating

With a 370V electrical rating

The junction box and terminal block design are specific to Williams wall furnaces that utilize a safety circuit loop

What is the shaft rotation for this part

This single motor mount arm is constructed from heavy-gauge steel to provide a robust anchoring point

Schneider Electric (Viconics) R820-643 Control 321894-708 With a 370V electrical ratingProfessional contractors and HVACR technicians requiring precise temperature management for resistive heating loads rely on the Schneider Electric Viconics R820 643. This microprocessor based SCR Power Control offers superior 3 phase SCR power control for HVAC electric duct heaters and industrial processes. Operating across a broad 24 600 Vac range with a robust 45 Amp capacity, it delivers precise modulation via zero cross firing, which eliminates