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Shunt trip vs interlock

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    Shunt trip vs interlock

    What’s the difference in using a shunt trip vs using a interlock kit for a disconnect?

    Can an interlock be used as a substitute for a shunt trip?

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    No. A shunt-trip breaker is merely a breaker that can be tripped "remotely" by applying a voltage to a built-in electromagnetic coil. Note that most are not designed for the coil to be continuously energized; supplying the tripping circuitry from the breaker itself is a common way to provide this.

    An interlock is a mechanical method of preventing two breakers or switches from being turned on simultaneously. A transfer switch, whether automatically or manually operated, is a popular use of an interlock, especially when the control circuitry itself is not to be solely relied upon.
    Master Electrician
    Electrical Contractor
    Richmond, VA