Page 213 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

®
Protistor Square-body Fuses
PSC aR sizes 7x - 650 V to 1300 VAC
Curves set

DC working voltage possibilities

Rated Curves (*) and Ipm ( ) corresponding to the rating
1
current 70 71 72 73 2x72 2x73
I (A) *Ipm *Ipm *Ipm *Ipm *Ipm *Ipm
N
(A) (A) (A) (A) (A) (A)
63 a 270
80 a 400
100 a 520
125 a 700
160 a 950 a 950
200 a 1300 a 1300
250 a 1800 a 1800
280 b 2200 a 2000 a 1800
315 b 2600 a 2300 a 2200 a 2000
350 c 3000 a 2700 a 2600 a 2400
400 b 3500 a 3200 a 3000
450 b 4000 a 3800 a 3500
500 c 4800 a 4600 a 3900
550 c 5200 b 5000 a 4400
630 c 6400 b 6200 a 5300 a 4400
700 c 6800 a 6000 a 5200
800 c 8000 b 8000 a 6400 a 6000
900 b 9000 a 7600 a 7000
1000 c 11000 a 9200 a 7800
1100 c 12000 b 10000 a 8800
1250 c 13500 b 12400 a 10600
1400 c 15000 c 13600 a 12000
1600 c 16000 b 16000
1800 b 18000
2000 c 22000
2200 c 24000
Top: Curves indicating the maximum time 2500 d 27000
constant L/R of the fault path as a function of 2800 d 30000
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. It 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.

SCAC141
12/04