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Telecommunication Electronics Inductive Cut-off

Telecommunication Electronics Inductive Cut-off

Telecommunication Electronics Inductive Cut-off 1. Leakage protection relay refers to the function of detecting and judging the leakage current, and it does not have the leakage protection device that cuts off and connects the main loop function. Leakage protection relays consist of zero...

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Telecommunication Electronics Inductive Cut-off



1. Leakage protection relay refers to the function of detecting and judging the leakage current, and it does not have the leakage protection device that cuts off and connects the main loop function. Leakage protection relays consist of zero sequence transformers, trip units, and auxiliary contacts for output signals. It can cooperate with the automatic switching of large current, as the total protection of the low voltage power grid or the leakage, grounding or insulation monitoring protection of the main road.
When the main circuit has a leakage current, the auxiliary contacts and the main circuit switch are connected in series to form a circuit. Therefore, the auxiliary contacts connect the separate trip unit and disconnect the air switch, AC contactor, etc. to make it switch off and cut off the main circuit. Loop. Auxiliary contacts can also be connected to acoustic and optical signal devices to issue a leakage alarm signal, reflecting the insulation status of the line.

2. Leakage protection switch means not only that it can turn on or off the main circuit like other circuit breakers, but also has the function of detecting and judging the leakage current. When leakage or insulation breakdown occurs in the main circuit, the leakage protection switch can be based on Judgment results switching elements that turn the main circuit on or off. It can be combined with fuses and thermal relays to form a complete low-voltage switch component.

At present, this type of leakage protection device is the most widely used, and the leakage protection switch on the market is commonly used according to the following categories:
(1) It only has the function of power leakage protection and must be used in conjunction with fuses, thermal relays, overcurrent relays and other protection components.
(2) It also has an overload protection function.
(3) At the same time with overload, short circuit protection.
(4) It also has a short circuit protection function.
(5) At the same time with short circuit, overload, leakage, overvoltage, undervoltage function.
3. Leakage protection socket refers to a power socket that detects and judges the leakage current and can cut off the circuit. Its rated current is generally less than 20A, leakage current 6 ~ 30mA, high sensitivity, commonly used in hand-held power tools and mobile electrical equipment protection and home, school and other civilian places.

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