Slow fuse and how to distinguish the power of fuse| HINEW

Fuse holder manufacturer

How to distinguish the power of the fuse? What is a slow fuse? How does it work? The following is an analysis by the manufacturer of the car safety seat for everyone.

What is a slow fuse

Deceleration fuse, also known as delay fuse, its delay characteristics are as follows: when a non-fault pulse current occurs in the circuit, it is not affected by the interference current and provides protection against overload. The current of some circuits when switching instantly is several times larger than the normal current, although this peak value is very large, but it appears for a very short time, we call it pulse current, and some call it impulse current, or surge current. General fuses can not withstand this kind of current, this kind of circuit may not be able to start normally if ordinary fuses are used, and if larger fuses are used, the circuit can not be protected when the circuit is overloaded. The melt of the delayed fuse is specially processed and has the function of absorbing energy. Adjusting the energy absorption can make it resist the impulse current and protect the overload. The characteristics of delay are specified in the specification. If the characteristics specified in the standard can not meet your requirements, you can contact the manufacturer to solve the problem.

how to distinguish the power of the fuse

The fuse current of the fuse should be between the rated current and the maximum current of the equipment, so as to ensure the normal operation of the equipment. Power off in time when approaching the maximum current.

The rated current is the current of the electrical appliance working under the rated voltage, which refers to the maximum current allowed to pass for a long time when heating does not exceed the allowable temperature for long-term heating at the reference ambient temperature and under the rated voltage working condition.

The maximum current refers to the limit of the current that can be borne without affecting the safety of the equipment, which is generally allowed to occur only for a short time, otherwise it will cause equipment damage.

The maximum working current of the motor is its working current, which can work for a long time, generally up to 1.2 times of the rated current, usually due to improper design power calculation, the selection of the motor is too small, but the motor can work continuously when the rated power is exceeded. At this time, the working current is the maximum working current.

Generally speaking, the fuse current should be taken into account when choosing a fuse. For example, a 30 A fuse means that the fuse current is 30 A, that is, when the current in the circuit reaches 30 A, the fuse will be fused. However, when the load power increases, the current increases. Therefore, it also indirectly reflects the power. According to the estimation of the squirrel cage motor with 380V voltage, the rated current of the 50KW motor is about 50A, the rated starting current is 50 × 6000A, and the formula for selecting the fuse is Inf=Ie/ (1.8mm 2.5) = 3002mm 150A.

The above is the introduction of "how to distinguish between slow melting and fast melting". We need to know more about it. Please contact our manufacturer.

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Post time: Feb-10-2022