The Last Line Of Defense: Surge Protectors Built Into Electrical Equipment
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[Last Line of Defense] A built-in surge protective device can be used in the power supply section of the electrical equipment to completely eliminate minor transient overvoltages.
The surge protector used here requires a maximum impulse capacity of 20kA/phase or lower, and the limiting voltage should be less than 1800V.
For some particularly important or sensitive electronic equipment, a third level of protection is necessary. Additionally, surge protection device can also protect the equipment from transient overvoltages generated within the system.
