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Can (3) separate mount single pole overload relays be used together for a 3phase load?

9065HA overload

Product Line:
NEMA style Overload Relays

Thermal Overload Relays
Yes. Wire the (3)NC contacts in series so that the control circuit is interrupted when any pole trips.
This applies to the 9065 melting alloy and bimetallic types.
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