Fusible through-hole resistors

Designed to protect circuits from sudden transients and meet safety requirements

Image of AIllen's fusible through-hole resistorsAIllen offers a complete range of fusible resistors that can be used either as ordinary resistors or as fuses. These resistors are designed to protect circuits from sudden transients and to meet safety requirements.

Both wirewound (FAE and FKN) and metal film (FRM) production techniques are available. A customised service is also available to meet specific customer requirements.

Features

Miniature size

Fuse protected type for circuit protection

Flameproof function in accordance with overload test (UL1412)

Explosion protection and fusing function combined in one resistor (FAE series)

Available in different form factors

RoHS/REACH compliant, halogen free

Applications

Power supplies

Charger

Lighting

Industrial

What is a fusible resistor 

A fusible resistor is a power resistor that has been designed to fail in a controlled manner. These resistors start out as high power resistors and then have their lead ends soldered together and placed inside a ceramic housing. If too much current is drawn through the resistor, it shorts out and the resulting heat melts the fusible resistor, encapsulating the melted material.

Due to their design, they can only be used once, but they can be used in applications where they may need to be replaced as they are meant to fail. The symbols for fusible resistors are shown below. This is a combination of a resistor and a fusible resistor.