Surface-Mount Fuses – Fundamentals
RoHS Compliant, ELV Compliant HF Halogen Free 107
TE Circuit Protection offers the widest selection of surface-mount
fuses available for addressing a broad range of overcurrent
protection applications. Helping to prevent costly damage
and promote a safe environment for electronic and electrical
equipment, our single-use chip fuses provide performance stability
to support applications with current ratings from .5A up to 20A.
TE Circuit Protection also offers the telecom FT600 fuse for
telecommunications applications. This telecom fuse helps comply
with North American overcurrent protection requirements,
including Telcordia, GR-1089, TIA-968-A (formerly FCC Part 68),
and UL60950 3rd edition.
Multi-layer Design for Chip Fuses
The multi-layer design has the benefit of exposing more fuse
element surface area to the glass-ceramic absorption material.
When the fuse elements open, there is more material for the
vaporizing fuse metals to absorb into, resulting in a very efficient
and effective quenching of the fuse arc.
Figure SF1 compares the multi-layer design of our SFF fuses with
standard glass coated designs. The glass coated designs rely on
the coating on only one side of the fuse element to absorb the
vaporizing fuse material when it opens. Therefore, there is much
less absorption material available to absorb the fuse metals. The
result can be prolonged arcing and possible coating breach.
Figure SF2 shows how the absorption characteristics of the two
designs differ. The multi-layer design indicates a clean separation
with the fuse element evenly diffusing into the surrounding
ceramic substrate. In the glass coated design, the element
diffusion takes place in a small portion of the device and is only
absorbed by the glass material directly above the area of failure.
Single-layer Glass Coated DesignMulti-layer Design
Multi-layer Design Single-layer Glass Coated Design
Wire-In-Air Design for 2410SFV Fuses
The 2410(6125) is a Wire-In-Air SMD fuse that is suitable for
secondary level overcurrent protection applications.
Figure SF3 compares our straight wire element design
2410SFV fuses with normal corrugated wire design fuse.
The straight wire element in air provides consistent fusing
and cutting characteristics together with inrush current
By introducing PCB assembly technology into the 2410SFV fuse
design and manufacturing process, lead-free compliance has
been achieved without the problems associated with end caps
on traditional ceramic devices.
Glass Fiber Enforced
Corrugated Wire Element
End Cap Plated with Tin
Straight Wire Element
Plated with Ni and Tin
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