Sihai network

Difference between load switch and circuit breaker

1、 Different nature

1. Load switch is a kind of switching appliance between circuit breaker and disconnector. It has a simple arc extinguishing device, which can cut off the rated load current and a certain overload current, but can not cut off the short-circuit current.

2. Circuit breaker refers to a switching device that can close, carry and disconnect the current under normal circuit conditions and can close, carry and disconnect the current under abnormal circuit conditions within a specified time.

2、 Different precautions

1. Load switch

Vertical installation, switch frame, closing mechanism, cable sheath and protective steel pipe shall be reliably grounded (not grounded in series). Several no-load opening and closing operations shall be carried out before operation, each rotating part shall be free of jamming, the closing shall be in place, and there shall be sufficient safety distance after opening.

The fuse melt used in series with the load switch shall be properly selected, that is, when the fault current is greater than the breaking capacity of the load switch, ensure that the melt is fused first, and then the load switch can be opened. The contact is good when closing, and the connecting part is free of overheating. During patrol inspection, pay attention to check the porcelain bottle for dirt, crack, porcelain falling, flicker and discharge; The switch shall not be flushed with water (indoor type).

2. Circuit breaker

Special attention should be paid to that the contact reliability of high-capacity circuit breaker will directly affect the normal use of the circuit breaker, so attention must be paid to the installation and the installation shall be carried out in strict accordance with the requirements of the manufacturer. (FuHeKaiGuanHeDuanLuQiDeOuBie)