Electrical Supplies
Thermal Overload Relays
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About
- Schneider TeSys Deca (formerly LRD) bimetallic thermal overload relays, which mount directly onto TeSys D contactors to form an extremely compact starter, with the LR3D range serving TeSys K. Adjustable current settings run in overlapping bands up to 80 A on the LRD frames, and protection extends to motors up to 630 A across the wider TeSys family.
Application
Fitted directly under the contactor in a motor starter, where the bimetallic element tracks the heating effect of the motor current and trips the control circuit before winding insulation is damaged by a sustained overload, a stalled rotor or single phasing. Used across pump, fan, compressor and conveyor starters, with a manual/automatic reset selector and a trip class matched to the motor's starting time, class 10 for normal starts, class 20 for high-inertia loads.
Standards & Reference 4 cited
IEC/EN 60947-4-1
Electromechanical contactors and motor starters: the duty ratings and endurance a starter is selected on.
IEC/EN 60947-5-1
Control circuit devices and switching elements: pushbuttons, selector switches and the contact reliability expected of them.
UL 60947-4-1
The North American adoption of the contactor and motor-starter standard, for equipment specified to UL rather than IEC rules.
CSA C22.2 No 60947-4-1
The Canadian adoption of the same contactor and motor-starter standard, usually certified alongside the UL listing.
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