Overload Relay
Overload Relay is a protective device used in electrical circuits to prevent motors and equipment from drawing excessive current, which can cause overheating and damage. It is commonly used in motor control circuits to provide thermal or electronic protection.
Types of Overload Relays:
1. Thermal Overload Relay
Uses a bimetallic strip that bends when heated by excessive current, triggering a trip mechanism.
Common in motor starters and industrial applications.
2. Electronic Overload Relay
Uses sensors and microcontrollers to monitor current.
More precise and adjustable compared to thermal relays.
Can include additional protections like phase loss detection.
Working Principle:
When the motor runs at normal current, the relay stays in a closed position.
If the current exceeds a preset limit for a certain duration, the relay trips, breaking the circuit and stopping the motor.
After tripping, manual or automatic reset is required.
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