Page 329 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

®
Other Protistor Fuses
Ferrule Fuses
22x58 gRC (URD) - 600 V to 690 VAC

DC Application data
Um (V)
L/R (ms)
100
1200
90
1100
80
1000
70
900
60
800
50
700
40 2
600
30
20 1 0 0 100 200 300 400 500 600 700
10
0 U (V)
0
100 200 300 400 500 600 700 U (V) Above: Curve indicates peak arc voltage Um
Ces courbes indiquent la constante de temps L/R maximale admissible en fonc- which may appear across fuse terminals at wor-
tion de la tension d’utilisation king voltage U.
Courbe 1 : Ip>1,6 I N pour fusibles gRC uniquement (calibres de 12 à 100 A)
Courbe 2 : Ip>2,5 I N pour fusibles gRC et URD

NEW gR-CLASS

OPTIMAL PROTECTION OF POWER EQUIPMENT t t
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-
loads, from low multiples of current ratings up to very high short-circuit 30s C'
currents. Enhanced performance enables these fuses to provide solu- Example:
tions to many previously unsolved problems in power electronics: pro- 100A aR vs. 100A gR
tection of cables without the use of additional components, protection
of equipment from fire hazards, selective coordination of different fuses
within a single power distribution installation... I I
300A 110A
minimum interrupting
current
SELECTIVE COORDINATION
gR-class semiconductor fuses can be utilized in association with gI and gG-class
low voltage power distribution fuses of the same current rating, installed upst-
aR gR 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
Example of
gG 100A
selective
coordination
gR 100A gR 100A
Before After

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
SCAC181