PRODUCTS

YL Fuse Disconnecting Switches

The switch with three-phase and half sealed structures is made up of two parts: the seat and the cover (melt-loading device). The front operation can observe the rated data of the fuse links and indicator status. The switch can be matched with NH000 and NH00 fuse. The switch has features of small volume, reliable operation, convenient fuse install and removal and small-required manual operation power.

YL Fuse Disconnecting Switches are mainly used in circuit with high short-circuit current and motor circuit as power switch, disconnecting switch or emergency switch and for AC protection. They’re unfit for directly opening and shutting single electric motor. Rated insulation voltage up to AC 50Hz 800V

Rated working voltage up to 690V

Rated working current up to 630A

Rated limiting short-circuit is 100kA at the voltage of 500V and 50kA at 690V

The switch complies with GB14048.3 and IEC/EN60947-3.

What’s the Difference Between a Disconnect Switch and Circuit Breakers?

Fused disconnect switches and circuit breakers are both intended to open a circuit quickly in the event of a current overload or a short circuit. Their designs vary greatly, however, and they may be used under slightly different circumstances, depending on the needs of your facility.

Fused disconnect switch

A fused disconnect switch is a combination of a switch to disconnect the circuit and a fuse to shut the circuit off in the event of a problem. When installing or maintaining equipment on the circuit, or the circuit itself, the switch provides a method to manually shut off the power. The fuse incorporates a small filament that is matched to the current rating of the circuit. If the amperage on the circuit exceeds the fuse’s rating for a long enough time, the filament will melt, disconnecting the circuit automatically and permanently.

To restore power, the fuse must be replaced. Fuses are available in multiple sizes and ratings. Standard fuses can react quickly to overcurrent situations, breaking the circuit almost immediately, while slow-burning fuses can handle high currents for short intervals, which can be useful to handle the inrush current of motors when they first start.

A circuit breaker combines the functions of a switch and an overcurrent disconnect into one device. When maintenance needs to be performed on the circuit or connected equipment, the circuit breaker can be manually turned off. When a short circuit or an overload is detected, an electromagnet turns the circuit breaker off automatically. To restore power once the fault has been corrected, the circuit breaker needs only to be turned back on.