Westcode Semiconductors F070BxxxN, F070BxxxS Tripping Curves

WESTCODE An IXYS Company French Ferrule Type Fuses 700V

Electrical Characteristics:

Times vs current characteristics

The following curves indicate, for each rated current, pre-arcing time as a function of RMS value of pre­arcing current I.

Tolerance for mean pre-arcing current: ±10% = ratings from 1, 2, 4A

± 8% = ratings from 6 to 63A

Fuses with gR characteristics can eliminate all overloads. They do not show a minimum breaking
capacity but limit currents of non-operation or operation in compliance with standard VDE 636/23.

I ≤ 4I ≥ 6

Total clearing I²t:

Horizontal curves show maximum values of total clearing I2t (I2tt) for each rated current as a function of
prospective current Ip @ 690V cosϕ = 0.15 (for 63A @ 600V cosϕ = 0.15). Oblique lines indicate total
clearing duration Tt, with associated pre-arcing duration in brackets.

Data Sheet F070BxxxN/S Issue 1 Page 3 of 5 March, 2005

WESTCODE An IXYS Company French Ferrule Type Fuses 700V

Cut off Characteristics:

The curves below show, for each rating, value of peak let-through current IC as a function of available
fault current Ip.

I ≤ 4I ≥ 6

Corrective Factor: Peak Arc Voltage:

Mean curves showing variation of total clearing

2

time (I

tt) and total clearing duration Tt as a

function of operating voltage U.

Curves showing peak value Um of arc voltage
which appears across fuse-link as a function of

operating voltage U @ cosϕ = 0.15.
(1) 63A rating – 600V
(2) (2) 1-50A rating – 690V

Data Sheet F070BxxxN/S Issue 1 Page 4 of 5 March, 2005