Page 325 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

Other Protistor Fuses
®
Ferrule Fuses
14x51 gRC(URC) - 600 V to 690 VAC

DC Application data

L/R (ms)
L/R (ms) Um (V)
100
100
90
90
80 1100
80
70 1000
70 900
60
60
50 1 800
50
700
40
40 3 600
30
30
500
20 20
0
2 0
10 10 100 200 300 400 500 600
0 0
100 200 300 400 500 600 100 200 300 400 500 600
0 0 U (V)
U (V) U (V)
Above. left and center: Curves indicate the permissible value of time constant L/R Above, right: Curve indicates peak arc
as a function of DC working voltage: voltage Um which may appear across
fuse terminals at working voltage U.
1- For rating 1,2 and 4 A (gRC) Ip ≥ 1,6 I N
2- Ip ≥ 1,6 I for gRC only (rating 6 to 50 A)
N
3- Ip ≥ 2,5 I for gRC and URC (rating 6 to 63 A)
N
NEW gR-CLASS
t t
OPTIMAL PROTECTION OF POWER EQUIPMENT C 100A "aR" 100A "gR"
Thanks to recent technological developments, Ferraz Shawmut today 2h
markets gR-class PROTISTOR ® fuses capable of clearing all types of over-
30s C'
loads, from low multiples of current ratings up to very high short-circuit
Example:
currents. Enhanced performance enables these fuses to provide solu-
100A aR vs. 100A gR
tions to many previously unsolved problems in power electronics: pro-
tection of cables without the use of additional components, protection
of equipment from fire hazards, selective coordination of different fuses I I
within a single power distribution installation... 300A 110A
minimum interrupting
current
SELECTIVE COORDINATION
gR-class semiconductor fuses can be utilized in association with gI and gG-class
aR gR low voltage power distribution fuses of the same current rating, installed upst-
ream. In a “selectively coordinated“ distribution installation, melting is limited
to the fuse associated with the faulted circuit, while upstream fuses remain
intact. This prevents unnecessary down-time due to power blackouts in non-
faulted branches.
Relay
gG 100A
Example of gR 100A gR 100A
selective
Before After coordination
M M
aR-CLASS vs. gR-CLASS FERRAZ SHAWMUT EXPERTISE
aR-class fuses feature a high minimum inter- gR-class fuses should be used in the design of low voltage equipment and in the protection of
rupting current as compared with their cur- power electronics equipment. Designers can often substitute a gR-class fuse for an aR-class fuse
rent rating. The primary time-current charac- (10x38, 14x51, 22x58, PSC 000 and 17x49 DIN80 or BS 88-4) but the reverse is not true: an aR
teristic of aR-class fuses is the CC’ curve, fuse can never replace a gR fuse. Start protecting your new equipment with gR-class fuses today.
above which another protection device must The application of gR class fuses, with current ratings less than 100 Amps, offers enhanced pro-
be associated. The gR-class fuse represents tection, safety and reliability, along with reduced risk of replacement errors and assembly costs.
considerably improved performance in semi-
conductor protection

SCAC177
12/04