Tripping mechanism: This section consists of necessary levers, slides, and springs which can trip the circuit once the bi-metallic strip senses higher temperature for a prolonged period of time.Thus, this bi-metallic strip acts as a physical temperature sensor based on which the relay can initiate any further action required. The amount of expansion depends on the temperature it faces which is directly proportional to the amount of current passing through the relay to the system. Under high temperatures, the strips expand and bend. As the name says, a bi-metallic strip is made up of two distinct metal strips. Temperature sensing element: This is usually a bi-metallic strip. As a result, it breaks open the circuit and protects the device or the system from being damaged permanently due to heat.Ī thermal overload relay comprises various movable parts that can sense heat and initiate the tripping of the faulty line from the others. This current goes through the relay and it senses the increase in temperature. But during a short-circuit or overloading, the machine or the system begins to draw a huge amount of current which can cause damage due to heat. Under normal situations, the heat generated within the relay remains normal. The basic idea is that the relay takes this current and recreates the heat generated in the system within itself. This current goes to the system through the relay contacts. The relay is connected to the system or the appliance withdrawing current from a certain source. Various Sections of a Thermal Overload RelayĪ thermal overload relay is essentially a feedback-based protection mechanism. If the temperature of the given system increases beyond a set point, the thermal overload relay operates and disconnects the faulty element from the rest of the system. A thermal overload relay is used for this purpose. Therefore, it is critical to identify and mitigate any such fault at the earliest. What is a Thermal Overload Relay?Īs the name suggests, a thermal overload relay protects a machine or a power system network against a fault due to rising temperature.Ī rise in temperature can happen due to various reasons like continuous operation or load on the power system being higher than the stipulated capacity or any fault causing the flow of short-circuit currents. A thermal overload relay is a safety device that triggers a circuit-breaking phenomenon by sensing a fault on the line it has been connected to.
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