DCMU - The brains of a Constant Current Regulator (CCR).
When combined with a firing card, display controller, and optional megger card, the Digital Control and Monitoring Unit (DCMU) completes the package of electronics for an L-829 style CCR.
CSS Controller - The control for a Circuit Selector Switch (CSS).
Add in a High Voltage Relay Control module per channel to make up to a 4 channel L-847 style CSS. When interfaced to a DCMU, coordinated switching decreases relay wear and tear.