P4802ACMC datasheet(170/212 Pages) TECCOR

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Fuse Selection Criteria

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SIDACtor® Data Book and Design Guide

Fuse Selection Criteria

A fuse can be relied upon to operate safely at its rated current, at or below its rated voltage.

This voltage rating is covered by the National Electric Code (NEC) regulations and is a

requirement of UL as protection against fire risk. The standard voltage ratings used by fuse

manufacturers for most small dimension fuses are 32 V, 63 V, 125 V, 250 V, and 600 V.

Fuses are not sensitive to changes in voltage; however, they are sensitive to changes in

current. The fuse will maintain “steady-state” operation from zero volts to the maximum

voltage rating. It is not until the fuse element melts and internal arcing occurs, that circuit

voltage and available power become an issue. The interrupt rating of the fuse addresses

this issue. Specifically, the voltage rating determines the ability of the fuse to suppress

internal arcing that occurs after the fuse link melts.

For telecommunication applications, a voltage rating of 250 V is chosen because of the

possibility of power line crosses. A three-phase voltage line will have voltage values up to

220 V. It is desirable for the voltage rating of the fuse to exceed this possible power cross

event.

UL 60950 has a power cross test condition that requires a fuse to have an interrupt rating of

40 A at 600 V. GR 1089 contains a power cross test condition that requires a fuse to have

an interrupt rating of 60 A at 600 V. A 125 V-rated part will not meet this requirement.

A 250 V part with special design consideration, such as Teccor’s F1250T TeleLink

fuse, does meet this requirement.

Because fuses are rated in terms of continuous voltage and current-carrying capacity, it is

often difficult to translate this information in terms of peak pulse current ratings. To simplify

this process, Table 5.1 shows the surge rating correlation to fuse rating.

Notes:

• The IPP ratings apply to a 2AG (glass body) slow blow fuse only.

• Because there is a high degree of variance in the fusing characteristics, the IPP ratings listed should only be used as approximations.

Table 5.1 Surge Rating Correlation to Fuse Rating

Fuse Rating

(mA)

Equivalent IPP Rating

10x160 µs

(A)

10x560 µs

(A)

10x1000 µs

(A)

250

301510

350

452520

400

503025

500

653530

600

754535

750

906550

1000

130

1250

160

115

100

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