2.2.5 Fuse and fuse holder

Fuse and fuse holder

EASI-Spare offers you a range of fuses, fuse switch disconnectors and fuse holders (1A to 1250A). 

What is a fuse switch disconnector? 

A fuse switch disconnector enables to cut off a circuit manually. They operate by isolating an electrical circuit off-load to condemn the circuit and to work downstream safely. Its feature is to protect the head of the electrical circuit. Be careful, never cut off a fuse disconnector because it may cause injury!

Operation: 

In the fuse switch disconnector holder, we put the fuse that we rate depending on the downstream equipment. You have the possibility to mount multipolar assemblies (thanks to assembly accessories). They are made based on self-extinguishing plastic materials, with contacts in silver plated copper. 

Horizontal disconnectors are a combination of low-voltage disconnectors and high breaking capacity circuit breakers mounted in a common plastic material body.

What is a fuse holder?

A fuse holder is an element included in an electrical panel. It is made for hosting a fuse and to be placed in the panel to protect the related equipment. It cannot be locked. 

What is a fuse?

Industrial fuses ensure the protection for installations against overloads or short-circuits. Its blow leads to the immediate stop of electrical current flow. 

We can find several ranges:

- Cylindrical fuses are made for functioning permanently at 100% of the rated current. 

- Glass fuses: Glass enables to see with transparency if the fuse is still working or if it has blown.

- Knife blade fuses are bigger than cylindrical fuses. Their size is due to their much higher voltage (up to 1230 A compared to 90 A for cylindrical fuses).

Characteristics of fuses:

- The nominal rating of the fuse is the value for which we rate the overload protection.

- The breaking capacity of the fuse is the maximum current going through fuses (we speak in Kamp).

- The operating voltage of the fuse is the maximum electrical voltage for which it should be used (220V, 590 V.…).

- The curve of the fuse is the sensitivity for which it should trip: fuse T delayed, fuse R fast.