Semiconductor fuses
fuses
Semiconductor (AC)
Other Protistor
®
Fuses
BS88-4 Fuses
17x49 gRB/URB - 690 VAC
EXTREMELY HIGH BREAKING CAPACITY FUSES:
PROTECTION OF SEMICONDUCTORS
AS PER IEC STANDARD 60269.1 AND 4
690 V VOLTAGE RATING AS PER IEC 33
gR CLASS (CURRENT RATING 12 TO 90 A) AS PER
VDE 636-23
- CLEARING ALL OVERLOADS
- IMPROVED SAFETY AND PROTECTION
- ENABLING SELECTIVE COORDINATION WITH ALL FUSES
WITHIN DISTRIBUTION CIRCUIT
aR CLASS (CURRENT RATING 100 A) ACCORDING TO VDE
636-23 AND IEC 60269.4
CONNECTION AS PER:
- GERMAN STANDARD DIN 43653/00C
- BRITISH STANDARD BS 88-4
These fuses are UL Recognized
Main Characteristics
Voltage
rating
UN( V )
Class
Current
rating
IN( A )
pre-arcing
I t @ 1 ms
I
2
tp (A2s)
2
Total clearing
I
2
t @ UN
I
2
tt (A2s)
Watts loss
0.8 IN
IN
Tested
Breaking capacity
Estimated
Breaking capacity
690
gRB
12
16
20
25
32
35
40
45
50
55
63
75
80
90
100
4.2
9.6
17.1
26.8
52.5
69
96
130
154
210
310
520
620
840
965
30
65
110
170
330
430
610
820
970
1320
1950
3250
3900
5300
6150
1.95
2.2
3.0
4.4
5.0
5.2
5.8
6.3
7.2
7.4
8.0
8.8
9.4
11
13
3.5
4.0
5.5
8.0
9.0
9.5
10.5
11.5
13
13.5
14.5
16
17
20
23.5
200 k A
@ 690 V
300 k A
@ 690 V
690
URB
200 k A
@ 690 V
300 k A
@ 690 V
Minimum operating voltage for separate trip-indicator: 20 V
SCAC
226
12/04
Semiconductor fuses
fuses
Semiconductor (AC)
Other Protistor
®
Fuses
BS88-4 Fuses
17x49 gRB/URB - 690 VAC
Total clearing I
2
t
K
I
2
t (A
2
s)
(2 ms)
(1,5 ms)
(1,3 ms)
(1 ms)
(0,8 ms)
3 ms (0,6 ms)
2 ms (0,4 ms)
1 ms (0,2 ms)
10 ms (5 ms)
1,5 ms (0,3 ms)
I
2
t corrective factor
1.4
1.2
1.0
0.8
0.6
100 A
90 A
80 A
75 A
63 A
55 A
50 A
45 A
40 A
35 A
32 A
25 A
10 5
10 ms (2,8 ms)
10 4
Left: Curve shows variation of
total clearing time (I2tt) and total
clearing duration Tt as a function
of operating voltage U.
8
7
6
5
4
ms
ms
ms
ms
ms
0.4
0.2
0
0
200
400
600
800
10 3
U (V)
Peak arc voltage
Um (V)
10 2
20 A
16A
12 A
1600
1400
10
10
10 2
10 3
10 4
1200
Ip (A)
Left: Curve shows peak value
Um of arc voltage which
appears across fuse-link as a
function of operating voltage
U@ cos
ϕ
= 0.15
Above: Horizontal curves show for each rated current maximum
values of total clearing I
2
t (I
2
tt) as a function of prospective
current Ip. @ 690 V.
cos
ϕ
= 0.15.
Oblique lines indicate total clearing duration Tt and associated
pre-arcing duration in brackets.
0
200
400
600 700
U (V)
Time vs current characteristics
16
20
25
32
35
35
45
50
55
63
75
80
90
100
Current limitation curves
I
C
(A)
5
10 5
10 4
10 3
10 2
C
C’
12
t (s)
I
N
=100 A, aR class with CC’
limiting curve.
a= 130
A2=0.6
B1= 1.25
B2= 0.6
Cf3= 0.8
4
10 4
Ic
=
2.
5
Ip
10
10 3
3
1
10 -1
10 -2
2
10 -2
10 -3
10 -4
10
10 2
10 3
Tolerance for mean pre-arcing current ± 9%.
10 4
10
1
10
10 2
2
10 3
3
Ic
4
=
2
Ip
10 4
5
I (A)
Ip (A)
Above: Curves show, for each rating, value of peak let-
through current IC as a function of available fault current Ip.
Above: Curves indicate, for each rated current, pre-
arcing time vs. R.M.S. pre-arcing current
SCAC
228
12/04
Semiconductor (AC) fuses
Other Protistor
®
Fuses
BS88-4 Fuses
17x49 gRB/URB - 690 VAC
Semiconductor fuses
Microswitch
DC Application data
L/R (ms)
100
90
80
70
60
50
40
30
20
10
100
200
300
400
500
600
0
0
1
2
1100
1000
900
800
700
600
500
100
200
300
400
500
600
0
0
Um (V)
8.5
20
31
7
10
23
cosses à souder
ou clips 2.8
Designation Ref. Num. Weight Pack
.
MC 6,3 GR 2.5
Y 310015
10 g 3 pieces
U (V)
U (V)
Above: Curves indicate permissible value of time
constant L/R as a function of DC working voltage.
Curve 1: Ip
≥
1,6 IN only for fuses gRB
(current rating from 12 to 50 A)
Curve 2: Ip
≥
8 IN for fuses gRB et URB
Curve indicates peak arc voltage
Um which may appear across the
fuse terminals at working voltage U.
Electrical characteristics:
I
N
= 3 A - U
N
= 250 VAC
I
N
= 2 A - U
N
= 30 VDC
Certain minimum operating vol-
tage/current
20 V-100 mA
NEW gR-CLASS
OPTIMAL PROTECTION OF POWER EQUIPMENT
Thanks to recent technological developments, Ferraz Shawmut today
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
currents. Enhanced performance enables these fuses to provide solu-
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...
t
C
100A "aR"
2h
30s
t
100A "gR"
C'
Example:
100A aR vs. 100A gR
minimum interrupting
current
300A
I
110A
I
SELECTIVE COORDINATION
aR
gR
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-
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
Before
After
gR 100A
gR 100A
M
M
aR-CLASS vs. gR-CLASS
aR-class fuses feature a high minimum inter-
rupting current as compared with their cur-
rent rating. The primary time-current charac-
teristic of aR-class fuses is the CC’ curve,
above which another protection device must
be associated. The gR-class fuse represents
considerably improved performance in semi-
conductor protection.
12/04
FERRAZ SHAWMUT EXPERTISE
gR-class fuses should be used in the design of low voltage equipment and in the protection of
power electronics equipment. Designers can often substitute a gR-class fuse for an aR-class fuse
(10x38, 14x51, 22x58, PSC 000 and 17x49 DIN80 or BS 88-4) but the reverse is not true: an aR
fuse can never replace a gR fuse. Start protecting your new equipment with gR-class fuses today.
The application of gR class fuses, with current ratings less than 100 Amps, offers enhanced pro-
tection, safety and reliability, along with reduced risk of replacement errors and assembly costs.
SCAC
229
Analog electronics
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