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Connecting Capacity UL/CSA

Flexible with Ferrule 1x 24-12 AWG

Rigid 2x 24-16 AWG

Rigid 1x 24-10 AWG

Flexible 2x 24-16 AWG

Flexible 1x 24-12 AWG

Flexible with Insulated Ferrule 2x 24-18 AWG

Flexible with Insulated Ferrule 1x 24-12 AWG

Flexible with Ferrule 2x 24-18 AWG

Function

Vector shift detection

10 minutes average value monitoring

Over- and underfrequency monitoring

Interrupted neutral monitoring

Over- and undervoltage monitoring

ROCOF monitoring

The CM-UFD.M33  is a multi-functional grid feeding monitoring relay, which provides interface protection and is to be installed between a renewable energy system and the public grid. This innovative relay guarantees grid stability and seeks to prevent blackouts. If the voltage or frequency magnitudes of the public grid are outside the permited range, then the device changes status and acts to disconnect the renewable energy system from the public grid by sending a signal to  a decoupling unit (e.g. contactor, switch disconnector or circuit breaker). As soon as the grid is stable again, the system may automatically reconnected. The CM-UFD.M33  provides different monitoring functions including over-/undervoltage and over-/underfrequency  as well as rate of change of frequency (RoCoF) and vector shift monitoring  functions, which detect a loss of mains event. This grid feed monitoring relay complies to G99 requirements.

ABB Grid Feeding Monitors