Page 20 - Fuse link Catalogue

BS88-1 or 6:1988, IEC 269-1

A.C. Performance
Current Rating (A) 2-80
Voltage Rating ac (V) up to 440 ASTA 20 Certified
Breaking Capacity ac (kA) 80

Breaking Capacity (AC) Discrimination
The standard ratings are ASTA 20 certified to 80kA, 415 Volt*, ‘SAFECLIP’ fuse links will discriminate with each other at fault levels up to their
to BS 88: Part 1 or Part 6: 1988 (IEC 269-1). rated a.c. performance when the ratio between ‘major’ and ‘minor’ current
*SS types are certified at 16.5kA, 240 Volt, and the NS32M40 ratings is 2:1 (See Application Notes.)
and ES63M80 at 80kA, 415 Volt.

Offset blade tag: Type SS Application Notes
Current Part Max voltage
rating Number rating ac Short circuit energy limitation and discrimination
2A SS2 240
4A SS4 240 The designers of electrical equipment such as switches and contactors have to
6A SS6 240 prove their products under the worst possible conditions (ie. At maximum
10A SS10 240 breaking capacity, at 110% rated voltage, very low power factor, and with faults
16A SS16 240 initiated at the most onerous points on the voltage wave), and they require
20A SS20 240 relevant data from the fuse link manufacturer.
However, in service the short circuit fault conditions are usually less exacting than
those produced in proving tests. In particular, the circuits are usually three-phase
with relatively high power factor. In practice, therefore, the I t
2
values of 'SAFECLIP' fuse links are significantly less than those tabulated and they
will discriminate with each other if the ratio between 'major' and 'minor' fuse links
Offset blade tag: Type NS in series is 2:1. Where 'SAFECLIP' fuse links are used as the minor rating in series
Current Part Max voltage with a 'RED SPOT' range fuse link as the major rating then
rating Number rating ac discrimination at 415/240 Volts will generally be achieved with a ratio of 1.6:1.
2A NS2 415
4A NS4 415
6A NS6 415
10A NS10 415
16A NS16 415 Offset blade tag: Safeclip
20A NS20 415 Type Rating A B D E G H
25A NS25 415 SS 2 - 20 25.00 14.50 51.00 11.00 0.80 3.60
32A NS32 415 NS 2 - 32M40 35.50 14.50 62.00 11.00 0.80 3.60
32M40A NS32M40 415 ES 40 - 63M80 39.00 17.50 69.00 15.00 1.25 3.60
Dimensions in mm
D
A
Offset blade tag: Type ES
Current Part Max voltage
C B
rating Number rating ac
40A ES40 440
50A ES50 440 G
H
63A ES63 440
63M80A ES63M80 415

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