What is a load switch? What is the difference between a load switch and a circuit breaker?

The load switch, also known as the load switch, is a switch that allows it to be turned on or off without exceeding the rated working load, and the corresponding isolating switch is not allowed to operate with load.

Commonly referred to as load switches, the functions usually include: short-circuit protection, overload protection, infrequent switching on and segmented power supply under normal conditions, etc.

It should be a switch that will automatically turn off when it exceeds a certain load. If the voltage or current exceeds a certain value, the switch will be automatically disconnected.

Load switches and circuit breakers are both electrical appliances used to close and shut off electrical circuits, but they play different roles in electrical circuits. Wherein the circuit breaker can cut off the load current and the open circuit current, the load switch can only cut off the load current, and the short-circuit current is cut off by the fuse.

1. The load switch can be broken with load and has the function of self-extinguishing arc, but its breaking capacity is very small and limited.

2.The breaking capacity of the circuit breaker can be very high in the manufacturing process. It mainly relies on the current transformer to cooperate with the secondary equipment to protect. It can have functions such as short-circuit protection, overload protection, and leakage protection.

Traditionally, a load switch is very different from a circuit breaker. The load switch is mainly used to break and close the load current, and the load switch can be used in conjunction with the high-voltage fuse to replace the first-class circuit breaker and cut off the fault current, that is, the short-circuit current, which also determines that the arc extinguishing function of the load switch is relatively weak, reducing the manufacturing cost; It is precisely because the traditional load switch is not used to cut off the fault current, so there is no need to connect with the protection device and automatic device, so most load switches are manually operated and cannot be operated electrically. In the design of the circuit breaker, it is considered that it must not only be able to break and close the load current, but also be able to cut off the short-circuit current after the fault, so it must be connected with the protection device and automatic device, so it has the function of closing and opening manually and electrically.

However, from a modern point of view, it is the introduction of foreign technology, the load switch is manufactured more and more like a circuit breaker, and the individual load switch has increased the arc extinguishing capacity and increased the electric operation function.

The switch that specializes in dealing with current (fault current, rated current) is a circuit breaker, and the insulation level of the circuit breaker is very low, so the ability to deal with overvoltage is very weak. The switch that specializes in dealing with voltage (the level of fracture insulation is very high, and can deal with high fracture withstand voltage value) is the isolation switch, commonly known as the knife switch, the isolation switch can not deal with any large current, rated current and short-circuit current, and can cut the small current circulation. The load switch is a switch in between, which can deal with the current (rated current) and voltage (the insulation level of the break is higher than that of the circuit breaker, but lower than that of the isolation switch), but although the load switch can break and close the rated current and close the short-circuit current, it is strictly forbidden to break the short-circuit current.

Since the load switch cannot interrupt the short-circuit current, a fuse must be installed to provide far backup protection.

The structure of SF6 load switch is mainly an arc extinguishing device, and SF6 gas is used as the insulation and arc extinguishing medium. 2. Application SF6 circuit breaker: SF6 circuit breaker is mainly used in ultra-high voltage and large-capacity power systems.

SF6 load switch: SF6 load switch has a larger application scenario, one is used as a closing and breaking load current and overload current, and the other is used to close and break no-load lines, no-load transformers and capacitor banks.

3. Features SF6 circuit breaker: SF6 circuit breaker has the characteristics of blocking effect, long electrical life, high insulation level, good sealing performance, self-protection and low operating power. SF6 Load Switch:

SF6 load switch has the characteristics of long electrical life, strong breaking force, three working positions, small current breaking and strong resistance to harsh environments. The above are the differences between SF6 load switch and SF6 circuit breaker, I hope it will help you. [smiles].

The load switch is mainly used for line maintenance and disconnection of electrical loads, which plays a role in safety isolation.

Circuit breakers are used for line overload or short circuit protection.

1. Substitution: The load switch and the current limiting fuse series group can be used instead of the circuit breaker. This is very important and an important role for load switches.

2. Breaking and closing: Because it has a certain arc extinguishing ability, it can be used to break and close the overload electric bridge current with a certain multiple of the load current and small stem is generally 3 to 4 times.

3. Application of load switch: The load switch is mainly used to break and close the load current, and it can also be used with the high-voltage fuse to replace the circuit breaker.

Many electrical appliances are essential in life, but we don't necessarily understand it. Do you know what the high-voltage load switch is? This is an electrical appliance with a function between a high-voltage circuit breaker and a high-voltage disconnector, and is often used in series with a high-voltage fuse; It is used to control power transformers.

What is the function of the high-voltage load switch.

High-voltage load switches can isolate the power supply, have obvious disconnection points, and are mostly used in stationary high-voltage equipment. The high-voltage load switch has an arc extinguishing device and a certain opening and closing speed, which can pass the normal working current and the specified short-circuit circuit in the closing state. It is strictly forbidden to turn on and off the circuit with load, and it is often used in series with high-voltage fuses.

The function is close to that of a high-voltage circuit breaker, which can simplify the power distribution device and relay protection, and reduce the equipment cost.

The high-voltage load switch has a simple arc extinguishing device, which can turn on and off a certain load current and overload current. However, it cannot disconnect the short-circuit current, so it is generally used in series with a high-voltage fuse, with the help of a fuse for short-circuit protection.

The load switch and combination electrical appliances are mainly composed of a frame, an isolation switch (the current limiting fuse of the combination is on the isolation switch), a vacuum switch tube, a grounding switch, a spring operating mechanism, etc. The product has compact structure, small size, long life, strong closing and breaking ability, and easy operation and maintenance. The vacuum switch is equipped with a spring operation mechanism, and the motor (also equipped with manual) spring energy storage and closing methods include electromagnet closing and manual opening and closing.

The isolation switch, vacuum switch, and grounding switch are interlocked with each other (mechanical interlock) to prevent misoperation.