4120 Series SCR Power Controller

The 4120 Series SCR Power Controller from Chromalox Instruments is a family of solid-state power controllers that regulate AC power delivery to resistive loads such as industrial heaters. These devices use silicon-controlled rectifiers (SCRs) to provide proportional power control.

The series covers both 240VAC and 480VAC configurations, including single- and three-phase controllers, with current ratings ranging from approximately 90 to 275 amps. It also includes the firing control cards used within these controllers.

Product Types

• Power controllers — 240VAC and 480VAC models across a range of amperage ratings, including three-phase units.
• Firing control cards — replacement firing cards for 240V and 480V controller configurations.

Applications

These controllers are commonly used in industrial heating applications, including paper processing and plastics heating equipment.