Overload relays are used for current dependent protection of electrical equipment (for example motors) against overheating. Overheating can be caused by overload, asymmetrical current consumption, phase loss in the power network, or locked rotor. With Overload, phase imbalance, phase loss or locked rotor there is an increase in the motor current that is well above the set rated motor current. This increase in current, that over a longer period of time can damage or even destroy the equipment, is monitored and evaluated by the overload relay. There are two function principles for overload relay protection available: thermal and electronic.
The 3RU11 thermal overload relays, from 0.11 A to 100 A, are designed for current dependent protection of loads with normal starting (Tripping class CLASS 10).
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