The ABB SPAJ142C RS611006-AA is a combined overcurrent and earth-fault relay.

• Overcurrent protection: This protects against excessive currents that can occur due to short circuits. Short circuits happen when there’s an abnormal connection between the live wires in a circuit.
• Earth-fault protection: This safeguards the system from faults involving the grounding system. In other words, it detects leakage of current to the earth.

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