Created by: Glen Zhu | Updated Date: November 19th, 2024
A circuit breaker needs to be installed before the surge protective device (SPD).
The surge protective device (SPD) may generate a large surge current in cases of lightning or other transient overvoltage situations. If these surges exceed the maximum withstand capacity of the surge protector (Imax), it may be punctured, leading to a short circuit fault.
To cut off this short circuit fault and ensure the safety of the power supply system, a circuit breaker needs to be installed before the surge protective device (SPD).
Additionally, the circuit breaker can prevent aging issues caused by frequent lightning strikes on the surge protector, disconnecting it before reaching its maximum heat tolerance.
Surge protective device (SPD) limit overvoltage through internal nonlinear components (such as varistors, gas discharge tubes or semiconductor devices). When the voltage exceeds a certain value, these components quickly conduct electricity and dissipate excess voltage into the ground, protecting equipment from damage.
Breaking capacity: The breaking capacity of a circuit breaker must be greater than the maximum short-circuit current at that location.
Testing requirements: The circuit breaker should not trip when subjected to 20 standard 8/20 μs and 1.2/50 μs test pulses at rated current.
Protection mode: Each pole of the surge protector must have protection set up; for example, a 1P+N surge protector requires a 2P circuit breaker.
By implementing these measures, it ensures that both the surge protector and circuit breaker work together effectively in protecting power supply systems from lightning and other transient overvoltage impacts.
Whether a surge protection device (SPD) needs a circuit breaker depends on its installation and the specific requirements of the system. Here’s a breakdown:
To sum up, while a surge protective device (SPD) often benefits from having a circuit breaker to protect it and the system, the need for one depends on the type of surge protective device (SPD) and its installation configuration.
LSP’s reliable surge protection devices (SPDs) are designed to meet the protection needs of installations against lightning and surges. Contact our Experts!
Copyright © 2010-2024 Wenzhou Arrester Electric Co., Ltd. All Rights Reserved. Privacy Policy
