Automatic surge protectors are an indispensable device for lightning protection of electronic equipment in the home. If you want to buy one, you need to determine some key parameters based on specific application requirements.
Automatic Surge Protectors Operating Voltage:
Definition:
Operating voltage refers to the maximum rated voltage that a surge protector can withstand when designed. Surge protectors usually need to match the rated voltage of the equipment to ensure that they can effectively protect electrical equipment.
Selection criteria:
In general, the operating voltage of a surge protector should match the operating voltage of the power system. For example, common voltage levels are 220V (single-phase) and 380V (three-phase).
Operating Frequency:
Definition:
The operating frequency refers to the grid frequency the surge protector is designed to withstand. Usually, the grid frequency is 50Hz or 60Hz, depending on national standards.
Selection criteria:
When selecting, make sure that the frequency range of the surge protector can cover the grid frequency used.
Under Voltage Cut-off:
Definition:
The under voltage cut-off is a voltage threshold set by the surge protector. When the grid voltage is lower than this value, the protector will cut off the power supply to prevent the voltage from being too low and causing damage to the equipment.
Selection criteria:
In general, the undervoltage cutoff voltage should be set below the minimum operating voltage of the equipment, but not too low to avoid accidentally cutting off the power supply. The typical value is generally set in the range of 160V-180V (for 220V system).
Over Voltage Cut-off:
Definition:
Overvoltage cutoff refers to the voltage threshold set by the surge protector. When the grid voltage exceeds this value, the protector will automatically cut off the power supply or perform current-limiting protection to prevent the equipment from being damaged by overvoltage.
Selection criteria:
The over voltage cut-off value should be selected below the maximum withstand voltage of the equipment, but it can usually be set to a higher voltage. For example, in a 220V voltage system, the overvoltage cutoff is generally set at 220V-265V.
Delay Time:
Definition:
Delay time refers to the delay time for the surge protector to start operating when the grid voltage fluctuates abnormally (such as overvoltage, undervoltage, etc.). By setting the delay time, short-term voltage fluctuations can be avoided to cause false operations.
Selection criteria:
Usually, the delay time is between a few hundred milliseconds and a few seconds, with common values of 0.5 seconds, 1 second, etc. Appropriate delay time helps reduce false operations and ensures that temporary fluctuations in grid voltage do not cause unnecessary operations of the protector.
Output Capacity:
Definition:
Output capacity refers to the maximum current or power capacity that a surge protector can provide under normal working conditions.
Selection criteria:
The output capacity should be determined according to the power of the device to be protected. If the power of the device is large, a surge protector with a larger capacity needs to be selected. For household appliances, a protector with a smaller rated power is usually selected; for industrial equipment, a surge protector with a larger capacity needs to be selected.
Common choices:
The choice of output capacity is usually based on the power requirements of the device and takes into account the current carrying capacity. Common output capacity selection ranges from a few kilowatts to several hundred kilowatts.
Surges are transient overvoltage signals caused by external interference or other factors in the circuit. If these transient overvoltage signals exceed the voltage value that the circuit equipment can withstand, it will cause damage to the equipment.
The function of the automatic surge protector is to detect voltage changes in the circuit. When the voltage change exceeds the set threshold, the circuit is immediately cut off to protect the equipment from surges.
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