DNH1 3 Phase Fused Disconnect Switch

DNH1 3 Phase Disconnect Switch Parameters

What is DNH1 3 phase disconnect switch?

The main function of 3 phase disconnect switch is to disconnect the current and change operation mode. However, when the current is high enough, it may cause damage to the components used for isolation in the disconnect switch, making the switch unusable.

Taking this into account, in order to be able to disconnect the high current, and more importantly, to protect the isolation switch in the face of high current, it is necessary to provide a fuse for protection, so that this type of disconnect switch is known as a fuse disconnect switch.

How many fuses does the 3 phase disconnect switch have?

The number of fuses for 3 phase disconnect switch is related to the phase number of power supply. The order of the power phase sequence is A, B, C, and N. ABC refers to the wire of three-phase power, and N refers to the neutral wire.

• 1 phase disconnect switch can be connected with any phase of the wire;
• 2 phase disconnect switch can be connected with any phase and a neutral wire;
• 3 phase disconnect switch is for three-phase power, there is three wire, and usually used for three-phase electrical bus switches and three-phase electrical equipment.
• 4 phase disconnect switch added an additional phase to 3 poles fused disconnect switch, which is for neutral wire.

In practice, the fuse disconnect switch with corresponding phase number can be selected according to the specific phase number of the power supply. Sometimes, there is not enough space in cabinet, the fused disconnect switch sizes has to be considered.

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How does 3 phase disconnect switch work?

DNH1 is a current protector made of the principle that the fuse is melted by the heat generated by itself after the current exceeds the specified value for a certain time so that the circuit is disconnected.

The fuse disconnect switch must meet the following requirements:

1. Protect the switch by using fuse;
2. Carry and break current under normal circuit conditions (including overload), and can carry current under specified abnormal circuit conditions (such as short circuit) and within specified time;
3. Provide safety isolation, ensure the circuit open and safe work.

Advantages of GRL’s DNH1 3 phase disconnect switch

DNH1 3 phase disconnect switch with load operation is applied to rated current 40A-630A, can be mounted on the bus, and can also be mounted to the mounting plate. Having the upper and lower end of the input and output structure, with blade introduced and arc extinguish device.

Switch with occasional closed test holes in cover, built-in signal switching, and detection switch, optional fuse monitors, and also can be used as a knife switch. With nice shape, novel and simple switch, in line with IEC60947-3, GB14048.3 standard, suitable for low-voltage cable branch boxes, integrated power distribution cabinets (JP cabinets), industrial control cabinets, etc. With arc extinguishing device, it is safer to use; Meet the latest standards of State Grid Corporation of China.

You can write an email to us at [email protected], stating the voltage, current and usage of 3 phase fused disconnect. We can recommend the appropriate fuse disconnect switch to you.