3 Phase Interupter? What is this called?

[volleypc]

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.

 

[analogkid2digitalman]

3 phase monitoring relay?

Here is an example:

http://www.alliedelec.com/Images/Products/Datasheets/BM/PHOENIX_CONTACT/909-0406.PDF

-AK2DM

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[peebee]

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.