No, an Earth Leakage Circuit Breaker (ELCB) should never be connected in reverse. ELCBs are designed to be installed in a specific orientation to function properly and ensure electrical safety. The current sensing coil or toroid within the ELCB is configured to detect imbalances between the current in the live and neutral conductors. If it's installed in reverse, it won't operate as intended and may not detect ground faults or leakage currents accurately. Incorrect installation can lead to electrical hazards and a false sense of security.