How To Work Thermal Overload Relay Sinhala - Overload Relay explained / Motor Starter | Electrical.

This video about How To Work Thermal Overload Relay Sinhala - Overload Relay explained / Motor Starter | Electrical.
Thermal Overload Relay - Construction, Working and Application. Thermal Overload is widely used for Motor Protection. Basically Thermal Overload Relay is an overcurrent protection of the simplest type. The working principle of Thermal Overload Relay is quite simple but interesting.
What's an Overload relay !? Thermal/Magnetic overload relay is a sensory device works with a contactor that protects a motor from Continuous high current draw and will allow a non-dangerous temporary overload such as a high current flow condition during starting. However, it will turn off the motor if a current is high enough to cause motor damage over time.
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thermal overload relay | motor overload | overload protection | overload working principal
How thermal overload relay work.
Overload relay is used in many application to prevent the damaging condition from happening. They are in many cases mounted on the contactor to make up a starter EXAMPLE direct online, star-delta and forward and reverse starters and so on.
Thermal overload relay is operated by a bimetallic strip which is around a heating element where the load current goes through.
When the excessive current pass through the heating element, a normally closed contact is opened which disconnect contactor control circuit from the power hence protecting from overload current.
They feature an adjustable current range with manual or automatic reset option.
Thermal overload relay is every cheaper solution to motor overload protection
Thermal overload relays are economic electromechanical protection devices for the main circuit.
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