Page 39 - Ferraz semiconductor BS88

Semiconductor fuses
Semiconductor (AC) fuses

®
Other Protistor Fuses
BS88-4 Fuses
17x49 gRB/URB - 690 VAC

DC Application data Microswitch

L/R (ms)
100
90 Um (V)
8.5
80
70 1100 20
60 1000
31 7
50 900
2 10
40 800
23 cosses à souder
30 700 ou clips 2.8
20 1 600 Designation Ref. Num. Weight Pack.
10 500 MC 6,3 GR 2.5 Y 310015 10 g 3 pieces
0 0
0 0 U (V)
100 200 300 400 500 600 100 200 300 400 500 600 Electrical characteristics:
U (V)
I = 3 A - U = 250 VAC
N
N
Above: Curves indicate permissible value of time Curve indicates peak arc voltage I = 2 A - U = 30 VDC
N
N
constant L/R as a function of DC working voltage.
Um which may appear across the
Curve 1: Ip ≥ 1,6 IN only for fuses gRB fuse terminals at working voltage U. Certain minimum operating vol-
(current rating from 12 to 50 A) tage/current
Curve 2: Ip ≥ 8 IN for fuses gRB et URB 20 V-100 mA
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' 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
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

gG 100A
Example of
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.
SCAC229
12/04