Page 68 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

®
Protistor Square-body Fuses
PSC aR sizes 3x - 450V to 700 VAC
Curves set

Sizes 30 - 31 - 32 - 33

DC working voltage possibilities

1
Curves (*) and lpm ( ) corresponding to the rating
Rated
current 30 31 32 33 2 x 32 2 x33
In (A) * Ipm * Ipm * Ipm * Ipm * Ipm * Ipm
(A) (A) (A) (A) (A) (A)
63 a 230
80 a 300
100 a 360
125 a 460
160 a 650
200 a 880 a 850
250 a 1300 a 1150
315 a 1700 a 1450
350 a 1900 a 1600
400 a 2300 a 2200 a 2000
450 a 2500 a 2300
500 a 3000 a 2600 a 2300
550 a 3400 a 3150 a 2500
630 a 5000 a 3700 a 3250
700 a 5600 a 4300 a 3900
800 a 5300 a 4800
900 a 7800 a 5600
1000 b 9000 a 6600 a 5200
1100 a 7700
1250 b 11000 a 7400 a 6500
1400 b 12500 a 8600 a 7800
1600 a 10600 a 9600
1800 a 15600 a 11200
2000 b18000 a 13200
2200 a 15400
2500 b 22000
2800 b 25000

Top: Curves indicating the maximum time constant L/R of the fault path as a function of the DC
voltage U for the rated currents in the sizes indicated in the table.
Ipm (1) values indicate the minimum breaking current in Amperes (A).

Remark:
When the fault current di/dt is very large, this condition can be exceeded. This is the case for faults
occurring in voltage commutated inverters.
Below: Curves indicating peak arc voltage Um which may appear across fuse terminals as a function
of the DC working voltage U, for various time constant L/R of fault path.

SCAC91
12/04