Product Overview
Arrow Hart 42001 Thermal Overload Relay Heater with Screw Terminals and Flat Mounting Tabs
Condition
Condition: unused new old stock (NOS). Held under the Arrow Hart 42001 heater designation. Verify suitability before use.
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Product Overview
Arrow Hart 42001 is a thermal overload heater: the current-carrying element of a motor starter's thermal overload relay. Motor current runs through the winding, and a sustained overload heats it enough to trip the relay and drop the starter out before the motor windings overheat.
Key Features
- Designation: Arrow Hart 42001
- Type: thermal overload heater element for a motor starter overload relay
- Construction: black wound element held in a light gray notched body
- Connections: slotted screw at each end of the winding, flat metal terminal tabs with oval holes
Frequently Asked Questions
Does an overload heater protect against a short circuit?
No. It responds to sustained overcurrent through heat, slowly enough to ride through a normal motor start. Short-circuit protection comes from the fuses or breaker ahead of the starter.
A part that runs warm on purpose: the heat in that winding is how the starter tells a long overload from a hard start.
