G&W Electric Company
3500 W. 127th Street
Blue Island, IL 60406 USA
Tel: 708.388.5010
Fax: 708.388.0755
www.gwelec.com
ISO 9001:2008 Certified
ISO 14001:2004 Certified
G&W Fused Switch Information Sheet
Important information regarding G&W switches equipped with 8.3kV dry well
fuse canisters
G&W switches can be equipped with 8.3kV rated air insulated, non-load break dry well fuse
canisters welded into an SF6 insulated tank. Switches can be equipped with a single fuse
canister per phase or two fuse canisters per phase connected in parallel. The information
below can be used for both of these switch types.



Continuous Current Ratings: The continuous current rating for each fuse canister, with
solid links (G&W part number A1952 0019 A00) installed in place of fuses, is 160A. The
current ratings provided by the fuse manufacturers assume the fuse canisters are
installed in oil. SF6 cannot transfer heat as efficiently as oil and, because of this, some
fuse designs may have their continuous current rating de-rated. The allowable
continuous current with the fuse installed in an SF6 insulated fuse canister is provided
for many commercially available fuses in the tables below.
Parallel Fuse Canisters: Designs with parallel fuse canisters are used for applications
where a higher continuous current is required. It is important to install fuses with the
same voltage and current ratings into each canister. Doing so will effectively double the
current rating per phase as compared to a switch equipped with one fuse canister per
phase.
Fuse Criteria: The following pages include a list of fuses that can be used with G&W
switches equipped with 8.3kV dry well fuse canisters. Other fuses are useable provided
they meet the criteria outlined below:
- Maximum fuse length: 10.11” to end of mounting stud
- Non-gassing type
- Non-indicator style fuses
- Nominal fuse diameter is 2.15” or less
- Stud on each end of fuse is .623” in diameter and 1” long
- Some fuse designs will have reduced current ratings because the fuse canister is
installed inside an SF6 insulated tank. The equation below can be used to
determine whether the fuse will have a reduced current rating.
𝐷𝑒 − 𝑅𝑎𝑡𝑒𝑑 𝐶𝑜𝑛𝑡𝑖𝑛𝑢𝑜𝑢𝑠 𝐶𝑢𝑟𝑟𝑒𝑛𝑡 𝑜𝑓 𝑎 𝑓𝑢𝑠𝑒 = √
32 𝑊𝑎𝑡𝑡𝑠
1.5 𝑋 𝐹𝑢𝑠𝑒 𝑅𝑒𝑠𝑖𝑠𝑡𝑎𝑛𝑐𝑒
The continuous current of the fuse installed in an SF6 insulated fuse canister is
the lesser of the current rating of the fuse or the result of the above equation.
The fuse resistance in the above equation must come from the fuse
manufacturer.
2

Explanation of the notes used in the tables below
Note 1: Each fuse has a range of resistances considered acceptable by the
manufacturer. The range of de-rated continuous current in the tables below is
calculated from this resistance range. The fuse’s actual de-rating can be
determined by using the equation above and measuring its resistance in ohms.
Note 2: G&W switches can be equipped with one fuse canister per phase or two
(parallel) fuse canisters per phase. Designs with parallel fuse canisters are used
for applications where a higher continuous current is required.
Note 3: G&W switches can be equipped with one fuse canister per phase or two
(parallel) fuse canisters per phase. Designs with parallel fuse canisters are used
for applications where a higher continuous current is required. Each fuse has a
range of resistances considered acceptable by the manufacturer. The range of
de-rated continuous current in the tables below is calculated from this resistance
range. The fuse’s actual de-rating can be determined by using the equation
above and measuring its resistance in ohms.
Cooper Power Systems Fuses for G&W 8.3kV rated fuse canisters
Maximum
Voltage
Fuse Type
NX
4.3kV
X-Limiter
Catalog Number
Factory
labeled
current Rating
(Amps)
Approximate De Rated
Continuous Current
(Amps)
FA1H18
18
No De Rating required
FA1H25
25
No De Rating required
FA1H35
35
No De Rating required
FA1H45
45
No De Rating required
FA1H50
50
No De Rating required
FA1H65
65
No De Rating required
FA1H75
75
71-75
1
FA1H100
105
87-100
1
(2) FA1H65 installed in parallel
130 (both fuses)
No De Rating required
(2) FA1H75 installed in parallel
150 (both fuses)
142-150 (both fuses)
3
(2) FA1H100 installed in parallel
210 (both fuses)
174-200 (both fuses)
3
43F008-I
8
No De Rating required
43F010-I
10
No De Rating required
43F012-I
12
No De Rating required
43F018-I
18
No De Rating required
43F025-I
25
No De Rating required
43F035-I
35
No De Rating required
43F045-I
45
39-43
43F050-I
50
No De Rating required
43F065-I
65
No De Rating required
43F075-I
75
66-73
Notes
1
1
3
NX
5.5kV
X-Limiter
8.3kV
NX
43F100-I
100
77-85
1
(2) 43F065-I installed in parallel
130 (both fuses)
No De Rating required
2
(2) 43F075-I installed in parallel
150 (both fuses)
132-146 (both fuses)
3
(2) 43F100-I installed in parallel
200 (both fuses)
154-170 (both fuses)
3
FA2H6
6
No De Rating required
FA2H8
8
No De Rating required
FA2H10
10
No De Rating required
FA2H12
12
No De Rating required
FA2H18
18
No De Rating required
FA2H20
20
No De Rating required
FA2H25
25
No De Rating required
FA2H35
30
No De Rating required
FA2H45
40
No De Rating required
FA2H50
50
No De Rating required
FA2H65
65
No De Rating required
FA2H75
75
71-75
1
(2) FA2H45 installed in parallel
80 (both fuses)
No De Rating required
2
(2) FA2H50 installed in parallel
100 (both fuses)
No De Rating required
2
(2) FA2H65 installed in parallel
130 (both fuses)
No De Rating required
2
(2) FA2H75 installed in parallel
150 (both fuses)
142-150 (both fuses)
3
55F008-I
8
No De Rating required
55F010-I
10
No De Rating required
55F012-I
12
No De Rating required
55F018-I
18
No De Rating required
55F020-I
20
No De Rating required
55F025-I
25
No De Rating required
55F030-I
30
No De Rating required
55F040-I
40
No De Rating required
55F050-I
50
No De Rating required
55F065-I
65
60-65
1
55F075-I
75
67-74
1
(2) 55F040-I installed in parallel
80 (both fuses)
No De Rating required
2
(2) 55F050-I installed in parallel
100 (both fuses)
No De Rating required
2
(2) 55F065-I installed in parallel
130 (both fuses)
120-130 (both fuses)
3
(2) 55F075-I installed in parallel
150 (both fuses)
134-148 (both fuses)
3
FA3H1
1.5
No De Rating required
FA3H3
3
No De Rating required
FA3H4
4.5
No De Rating required
FA3H6
6
No De Rating required
FA3H8
8
No De Rating required
FA3H10
10
No De Rating required
4
FA3H12
12
No De Rating required
FA3H18
18
No De Rating required
FA3H20
20
No De Rating required
FA3H25
25
No De Rating required
FA3H30
30
No De Rating required
FA3H40
40
No De Rating required
83F003-I
3
No De Rating required
83F006-I
6
No De Rating required
83F008-I
8
No De Rating required
83F010-I
10
No De Rating required
83F012-I
12
No De Rating required
83F018-I
18
No De Rating required
83F020-I
20
No De Rating required
83F025-I
25
No De Rating required
83F030-I
30
No De Rating required
83F040-I
40
37-40
1
83F050-DW
50
42-47
1
(2) 83F030-I installed in parallel
60 (both fuses)
No De Rating required
2
(2) 83F040-I installed in parallel
80 (both fuses)
74-80 (both fuses)
3
(2) 83F050-DW installed in parallel
100 (both fuses)
84-94 (both fuses)
3
3563003M11M
3
No De Rating required
3563006M11M
6
No De Rating required
3563008M11M
8
No De Rating required
3563010M11M
10
No De Rating required
3563012M11M
12
No De Rating required
3563018M11M
18
No De Rating required
3563020M11M
20
No De Rating required
3563025M11M
25
No De Rating required
3563030M11M
30
No De Rating required
3563040M11M
40
37-40
1
3563050M11M
50
44-50
1
(2) 3563030M11M installed in parallel
60 (both fuses)
No De Rating required
2
(2) 3563040M11M installed in parallel
80 (both fuses)
74-80 (both fuses)
3
(2) 3563050M11M installed in parallel
100 (both fuses)
88-100 (both fuses)
3
X-Limiter
8.3kV
ELX
Cutler Hammer Fuses for G&W 8.3kV rated fuse canisters
Fuse
Type
Rated Max Voltage
(kV)
Catalog Number
Factory
labeled
current Rating
(Amps)
CX
4.3
4CX-18C
18
Approximate De-Rated
Continuous Current
(Amps)
No De Rating required
Notes
5
CX
CX
5.5
8.3
4CX-25C
25
No De Rating required
4CX-35C
35
No De Rating required
4CX-45C
45
No De Rating required
4CX-50C
50
No De Rating required
4CX-60C
60
57-60
1
4CX-65C
65
59-65
1
4CX-75C
75
65-72
1
4CX-80C
80
70-80
1
4CX-100C
100
79-88
1
(2) 4CX-60C installed in parallel
120 (both fuses)
114-120 (both fuses)
3
(2) 4CX-65C installed in parallel
130 (both fuses)
118-135 (both fuses)
3
(2) 4CX-75C installed in parallel
150 (both fuses)
130-144 (both fuses)
3
(2) 4CX-80C installed in parallel
160 (both fuses)
140-160 (both fuses)
3
(2) 4CX-100C installed in parallel
200 (both fuses)
158-176 (both fuses)
3
5CX-10C
10
No De Rating required
5CX-12C
12
No De Rating required
5CX-18C
18
No De Rating required
5CX-20C
20
No De Rating required
5CX-21C
21
No De Rating required
5CX-25C
25
No De Rating required
5CX-30C
30
No De Rating required
5CX-35C
35
No De Rating required
5CX-40C
40
No De Rating required
5CX-50C
50
No De Rating required
5CX-60C
60
52-60
1
5CX-65C
65
59-65
1
5CX-75C
75
66-73
1
(2) 5CX-40C installed in parallel
80 (both fuses)
No De Rating required
2
(2) 5CX-50C installed in parallel
100 (both fuses)
No De Rating required
2
(2) 5CX-60C installed in parallel
120 (both fuses)
104-120 (both fuses)
3
(2) 5CX-65C installed in parallel
130 (both fuses)
118-130 (both fuses)
3
(2) 5CX-75C installed in parallel
150 (both fuses)
132-146 (both fuses)
3
8CX-3.5C
3.5
No De Rating required
8CX-4C
4
No De Rating required
8CX-4.5C
4.5
No De Rating required
8CX-6C
6
No De Rating required
8CX-7C
7
No De Rating required
8CX-8C
8
No De Rating required
8CX-10C
10
No De Rating required
8CX-12C
12
No De Rating required
8CX-15C
15
No De Rating required
6
8CX-18C
18
No De Rating required
8CX-20C
20
No De Rating required
8CX-25C
25
No De Rating required
8CX-30C
30
No De Rating required
8CX-35C
35
33-35
8CX-40C
40
No De Rating required
(2) 8CX-25C installed in parallel
50 (both fuses)
No De Rating required
2
(2) 8CX-30C installed in parallel
60 (both fuses)
No De Rating required
2
(2) 8CX-35C installed in parallel
70 (both fuses)
66-70 (both fuses)
3
(2) 8CX-40C installed in parallel
80 (both fuses)
No De Rating required
2
1
Thomas and Betts Fuses for G&W 8.3kV rated fuse canisters
Fuse
Type
FX
Rated Max
Voltage (kV)
10
Catalog Number
Factory labeled
current Rating
(Amps)
Approximate De-Rated
Continuous Current (Amps)
HTFX230003
3
No De Rating required
HTFX230006
6
No De Rating required
HTFX230008
8
No De Rating required
HTFX230010
10
No De Rating required
HTFX230012
12
No De Rating required
HTFX230018
18
No De Rating required
HTFX230020
20
No De Rating required
HTFX230025
25
No De Rating required
HTFX230030
30
No De Rating required
HTFX230040
40
No De Rating required
HTFX230050
50
45-50
1
(2) HTFX230030 installed in parallel
60 (both fuses)
No De Rating required
2
(2) HTFX230040 installed in parallel
80 (both fuses)
No De Rating required
2
(2) HTFX230050 installed in parallel
100 (both fuses)
90-100 (both fuses)
3
Notes