UL cUL Certified 5x20mm Fast Quick Acting Ceramic Tube Fuse 1.25A 250V F Cylindrical Miniature Fuse Link For Adapter

UL cUL Certified 5x20mm Fast Quick Acting Ceramic Tube Fuse 1.25A 250V F Cylindrical Miniature Fuse Link For Adapter

Features

Current rating 1.25A
Rated at 250V AC
Nickel plated brass end caps
Supplied singly

UL,cUL listed

Professional range of Schurter fuses from the SP series. The fuses are available in a variety of current ratings.
Pigtail Type
Nickle Plated Copper Alloy endcaps
Ceramic
Cylindrical
Mounting Style - Holder/Clip
Very high breaking capacity
Good mechanicalibration characteristics
Ceramic cartridge bodies are sand filled
 

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Specification

A=250V,B=125V

Dimension   mm

Agency Approvals

Applications

Typical Applications include short-circuit protection of semiconductors such as thyristors, diodes and triacs.Note that with values of greater than 6.3A the use of open type fuseholders is recommended, to reduce the risk of nuisance tripping at or near full rated current.

- Primary Protection in Equipment

- Power Supplies

- Battery

- LED lighting

Description

- IEC Standard Fuse
- H = High Breaking Capacity (Ceramic Tube)

Standards

- IEC 60127-2/1
- UL 248-14
- CSA C22.2 no. 248.14

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.