Earth Leakage Relays (ELRs), 3-Phase Relay | RS
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    Earth Leakage Relays

    Earth leakage relays (also known as ELRs or by the alternative name of differential relays) are specialised latching relays that are used to monitor the leakage of current to earth on 3-phase electrical systems, interrupting the circuit in the event that a dangerous voltage leak is detected. Earth leakage relays can be found in domestic distribution boards and are used to sense insulation failures, preventing electric shocks. At RS, we supply a range of earth leakage relays from trusted brands, including Broyce Control, IME and Socomec.

    What do earth leakage relays do?

    Earth leakage relays monitor a circuit for significant leakage between the electrical supply and the earth by tracking the current that flows through both the phase conductor and neutral conductor of the electrical circuit. If the phase and neutral currents are equal and balanced, the relay will not interrupt the circuit as there is no difference between the two and therefore no signs of voltage leakage. However, if there is a difference, the relay will interrupt the flow of the current and trip the breaker, switching the circuit off to prevent any injury via electric shock.

    35 Producten voor Earth Leakage Relays

    Lovato
    50 Hz, 60 Hz
    0.025 → 25A
    1
    -
    -
    -
    -
    -
    -
    -
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    Socomec
    -
    -
    -
    -
    -
    -
    -
    DIN Rail
    -
    -
    -
    Broyce Control
    50 Hz, 60 Hz, 400Hz
    30A
    SPDT, SPNO
    -
    Type A
    Remote
    -
    -
    -
    44 x 63.5 x 85mm
    (AC Power Supplies)190 g, (DC Power Supplies)110g
    Lovato
    50 Hz, 60 Hz
    0.025 → 25A
    2
    -
    -
    -
    -
    -
    -
    -
    -
    Socomec
    47 → 63Hz
    0.03 mA → 30A
    2
    0 → 10s
    -
    Remote
    -
    -
    -
    44 x 63.5 x 85mm
    190g
    Schneider Electric
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Lovato
    50 → 60Hz
    -
    Normally De-energised
    -
    -
    -
    -
    -
    -
    -
    -
    Carlo Gavazzi
    -
    -
    -
    -
    -
    -
    1, 3
    DIN Rail
    DEA71
    67.7 x 35.5 x 81mm
    -
    Schneider Electric
    50/60Hz
    300mA
    -
    -
    Type A
    -
    -
    -
    -
    -
    -
    Schneider Electric
    50Hz
    300mA
    -
    -
    Type A
    -
    -
    -
    -
    -
    -
    Siemens
    60Hz
    -
    3NO
    -
    -
    -
    -
    -
    -
    -
    -
    Schneider Electric
    50 To 400Hz
    85000A
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Lovato
    50 Hz, 60 Hz
    0.025 → 25A
    2
    -
    -
    -
    -
    -
    -
    -
    -
    Siemens
    50Hz
    -
    3NO
    -
    -
    -
    -
    -
    -
    -
    -
    Broyce Control
    50 Hz, 60Hz
    1.5 mA → 1A
    SPDT, SPNO
    -
    Type A
    Remote
    -
    -
    -
    44 x 63.5 x 85mm
    120g
    Lovato
    50 Hz, 60 Hz
    0.25 → 2.5A
    SPDT
    -
    -
    -
    -
    -
    -
    -
    -
    Lovato
    50 Hz, 60 Hz
    0.25 → 2.5A
    SPDT
    -
    -
    -
    -
    -
    -
    -
    -
    Lovato
    50 Hz, 60 Hz
    0.25 → 2.5A
    SPDT
    -
    -
    -
    -
    -
    -
    -
    -
    Lovato
    50 Hz, 60 Hz
    0.25 → 2.5A
    SPDT
    -
    -
    -
    -
    -
    -
    -
    -
    Carlo Gavazzi
    -
    -
    -
    -
    -
    -
    1, 3
    DIN Rail
    DEB71
    70.4 x 35.5 x 81mm
    -
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