1021B Single Phase Power Controller

The model 1021B is a single phase, Zero-Cross SCR power controller that controls the electrical power applied to a single phase load by fast cycling, distributive zero-cross operation of a pair of SCR’s. The power applied to the load is linear with respect to the command signal. Available command signals include 0/5 VDC, 0/10 VDC, or potentiometer. The model 1021B is available with current ratings from 10 to 70A and voltage ratings from 120 to 575 VAC.

The model 1021B has Sync-Guard, a feature which reduces the possibility of two or more controllers operating synchronously. When more than one model 1021B is operating off of the same line, Sync-Guard™ can minimize the possibility of all controllers turning on and off simultaneously.

The model 1021B is a compact and economical power control solution for industrial applications that require high reliability and long life. The fast solid state switching of the model 1021B provides superior performance over relays, contactors and other slower cycling controllers by reducing temperature variations associated with the longer ON/OFF cycles of those devices. The result is a more precise control of the heating process and extended heater life. Zero-Cross control generates minimal RFI noise, virtually eliminating the possibility of interference with other electronic equipment. Line voltage compensation greatly reduces load power variations that result from line voltage changes. This feature provides a more constant load power independent of line voltage variations.