No, if the AC MCB has earth fault tripping means, that function does not work on DC. Since for earth fault, inside the Current transformer does not generate output for DC current. Final Word, Do not use AC MCB on DC Circuits. AC MCB works very well in DC circuits and it operates over load trips, Short circuit trips but it can not operate on 5.2 AC Miniature Circuit Breaker (MCB) Market Size Forecast by Type 5.2.1 Type B 5.2.2 Type C 5.2.3 Type D 5.2.4 Others 5.3 Market Attractiveness Analysis by Type Chapter 6 Global AC Miniature Circuit Breaker (MCB) Market Analysis and Forecast by Applications 6.1 Introduction 6.1.1 Key Market Trends & Growth Opportunities by Applications
The operation of MCB is to break the contact to assist in securing the circuit from errors. Similar to the Molded Case Circuit Breaker, the Earth Leakage Circuit Breaker also capable of disabling the circuit contacts through the mains supply. However different to the MCB, it doesn’t disable the circuit contacts within the case of an

ELCB or Earth Leakage Circuit Breaker is a protection device that protects against earth leakage. Initially, the earth leakage circuit breaker were voltage detection devices, now they are switched to current sensing devices. The current ELCB is renamed as RCCB or RCD while the voltage ELCBs are still known as ELCB but they are obsolete.

1. Be sure you are resetting the breaker properly. First of all, be sure that you are taking the proper steps to reset the breaker. It sounds silly, but make sure you’re flipping the right switch. Also, be sure that you’re pushing the breaker handle firmly and fully to the off position, and then back to the on position. 2.
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MCB Selection Guide. MCBs or Miniature Circuit Breakers are intended to give protection against overloads and short circuits, which can cause damage to cables and equipment. MCBs have current ratings (6A, 10A etc.) above which they will start to open or trip and give protection to the equipment. The first characteristic is the overload which is bc6hdXE.
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