RCD Type MI

Residual current devices (RCDs) of Type A are widely used in mobile power distribution and provide reliable protection – but only as long as DC fault currents remain below 6 mA. If the DC fault current exceeds this value, a Type A RCD can saturate (“blind”), leading to a complete loss of function and thus no personal protection.

A typical risk arises from modern, frequency-controlled devices such as fans, spotlight ballasts, or motor controllers. These can generate not only 50/60 Hz currents but also high-frequency and smooth DC fault currents – currents for which a standard Type A or F RCD no longer provides adequate protection. In such cases, a Type B RCD is recommended, but it is expensive and not always necessary.

Efficient Solution for Mobile Applications – The INDU-ELECTRIC RCD Type MI offers a practical solution for exactly these challenges. This technology can be integrated into any Power Distribution Unit.

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RCD Type MI: Modular residual current protection solution for DC residual currents

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The “INDU-ELECTRIC RCD Type MI” offers a wide range of benefits:

— Can be operated downstream of Type A or F RCDs, or at unknown supply points —

— Significant cost advantage compared to comparable systems —

— All-current sensitive detection and disconnection for DC fault currents ≥ 6 mA —

— Integrated 30 mA personal protection, sensitive up to 1 kHz frequency —

— Voltage-independent disconnection —

— Ideal for mobile use and various locations —

— Fully integrable into any INDU-ELECTRIC power distribution unit —