United Automation A437309, HVAC Control 38A

The United Automation PR3-E series 27kW three phase HVAC controller. The PR3 range of Thyristor stacks provides full seamless control of three phase resistive loads, using two thirds control technique. It is suitable for 3-wire, 3-phase floating-star or closed-delta configured resistive loads.

Over temperature protection
Phase loss detection
Sensor loss detection