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Learn more by watching our Tesla D1321 | Thermal Overload 12-18Amp video.
The Tesla D1321 is a thermal overload relay with an adjustable setting range of 12 to 18 A. The D1321 pairs with D09 to D32 contactors and offers manual or automatic reset.
A motor that draws over its rating does not fail straight away. It heats, and it keeps heating until the windings give out. A thermal overload relay works on that timescale. The D1321 responds to sustained overcurrent rather than to the brief inrush of a normal start. Its setting is adjustable across 12 to 18 A to match the motor it protects.
A thermal overload relay provides no short-circuit protection. It responds to sustained overload, not to a fault current, so the circuit still needs a fuse or motor-rated circuit breaker upstream of it. Set the dial to the motor's full load current rather than to the top of the range, because a setting above the motor rating leaves the motor unprotected. Trip class and auxiliary contact arrangement are not stated for the D1321, so confirm both against the motor start time and the control circuit before wiring it in.
(D1321)
It’s sized for motors in the 12–18A range, providing dependable overload protection for heavy-duty use.
Use the built-in dial to set the relay between 12A and 18A to match your motor’s rating.
No. It ignores brief inrush currents at startup and only trips on sustained overloads.
Yes. It’s built for motors that handle high-demand, continuous workloads.
Yes. It’s commonly installed to prevent costly downtime on production lines.
Too low could cause nuisance trips; too high may leave the motor unprotected.
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