PRODUCTS

This series fuse is mainly used for protecting the electrical circuit against overload and short-circuits(gG/gL). Because of different melting tablets, it also may derive for protecting the semiconductor device and others complete set installment from short-circuit (aR/gR/gs/gtr) as well as the electric motor from short-circuit (aM). They conform to GB13539 and international electrical committee standard (IEC60269).

This series of fuse consists of fuse link and fuse base. The fuse bases is made of high strength ceramic floor or high temperature resin floor, wedge-shaped combination of static contact. It is open structure and with good heat dissipation, high mechanical strength, access to reliable and easy to operate. Matched with this series, NH fuse puller is used to pull the fuse from the base.The fuse body made by pure copper or silver piece(or silver wire) is sealed in the fusion tube which is made by the high strength porcelain.

There is full of the high-purity quartz sand processed after chemistry to take the extinguishing of arc medium in the tube.The fuse may have fuse indicator or striker, when the fuse element fusing it can demonstrate fusing or transforms each kind of signal as well as automatic transfer circuit(striker).

What's the difference between the slow blow and fast acting fuse in terms of performance and application?

A slow blow fuse is different from a fast acting fuse in its capability to withstand transient pulse currents, i.e., it can withstand the surge current upon power-on/off, thus ensuring the equipment works normally. Therefore, slow blow fuses are often called time-delay fuses. Technically, a slow blow fuse features a higher I2t value, and it requires more energy to blow, so it is more capable of withstanding pulses compared with a fast acting fuse of same rated current.

When an overcurrent occurs in a circuit, the breaking time of a slow blow fuse takes longer than that of a fast acting fuse because of the larger I2t. Is it less protected this way as some people are worried? The answer is no. Once the circuit fails, the overcurrent will last and corresponding energy released will go beyond the I2t of the fuse until it blows out. The timing difference of slow blowing and fast acting is not significant to their protection. Slow blowing will affect the protection performance only when sensitive components existing in the protected circuit need to be protected.

Due to the previous difference, slow blow and fast acting fuses are applied to different circuits. Fast acting fuses must be used in purely resistive circuits (no or fewer surges) or the circuits where IC and other sensitive components need to be protected, while slow blow fuses are preferably used in capacitive or sensitive circuits where surges occur upon power-on/off and power input/output. Apart from circuits for IC protection, most applications with fast acting fuses can be replaced with slow blow ones to enhance anti-surge capability. Contrarily, replacement of applications with slow blow fuses to fast acting ones may cause the fuse to break as soon as the equipment is switched on and fails to work.

Furthermore, economic consideration is also an indirect factor for selection because a slow blow fuse is much expensive than a fast acting one.