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3 Phase Interupter? What is this called?

3 Phase Interupter? What is this called?

3 Phase Interupter? What is this called?

(OP)
We have a well that we have had to replace a few times.  One of the phases is going out and it tries to continue to run.  There is a device I have used on a machine in the past where if one phase went out it would shut down the other phases.    What is this device called?  Thanks for your help.

RE: 3 Phase Interupter? What is this called?

There are various relays which can be used to protect against single-phasing, including ANSI 46 Reverse-phase or phase-balance current relay; ANSI 47 Phase-sequence voltage relay; and ANSI 48 Incomplete sequence relay.

Note that many (most? all?) solid-state overload devices now also provide single-phase protection at a similar cost to traditional bimetallic or melting-alloy overloads.

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