earth impedance test device / relay / automatic / primary injection

For testing every type and generation of protection relays, the CMC 356 is the universal solution. It features six powerful current sources (three-phase mode: up to 64 A/860 VA per channel) and has an exceptional dynamic range. These benefits ensure the unit can test even high-burden electromechanical relays with exceptionally high power demands.

The CMC 356 is the premier choice for applications which need the highest amount of power, amplitude and versatility. Its ability to perform wiring and plausibility checks or current transformers is priceless to commissioning engineers. It does this by utilizing a primary injection of high currents from the test set.