MMI 12RCM – Modular measurement technology for the top-hat rail


The MMI 12RCM module is a current module for connection to an MMU 3 or any other master device with a local bus connection. Up to 12 residual currents can be measured with each MMI 12RCM. The MMI 12RCM can be connected to other devices with an RJ45 cable via the local bus interface. With a maximum of 5 modules connected to each other, up to 60 residual currents can be measured.
The current inputs are designed for residual current transformers (e.g. type RCM-CT) and offer connection via plug-in contacts.


The unit is used for continuous monitoring of residual currents.

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