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How does a magnetic-only trip unit work?

Issue:
Where is a magnetic-only trip unit used and how does it work?

Product Line:
Molded Case Circuit Breakers

Environment:
Motor Circuit Protection

Cause:
Application

Resolution:
Magnetic (instantaneous only) trip units are used for short circuit protection only, usually in motor circuits. They have no long-time characteristic and will not trip below the instantaneous trip current, which is usually an adjustable setting.
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