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G&W Fused Switch Information Sheet

Important information regarding G&W switches equipped with 15.2kV dry well fuse canisters

G&W switches can be equipped with 15.2kV 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 B00) 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 15.2kV dry well fuse canisters. Other fuses are useable provided they meet the criteria outlined below:

-Maximum fuse length: 14.37” 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.

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.

  • 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.

Note 4: Fuses with 4.3kV, 5.5kV, 8.3kV and 10kV voltage ratings can be used with G&W switches equipped with 15.2kV fuse canisters. These fuses are physically shorter than 15.5kV and 17.2kV rated fuses and require the use of a fuse adapter. The fuse adapter is available from G&W.

Cooper Power Systems Fuses for G&W 15.2kV rated fuse canisters
Max Voltage / Fuse Type / Catalog Number / Factory labeled current Rating (Amps) / Approximate De-rated Continuous Current (Amps) / Notes
4.3kV / NX / FA1H18 / 18 / No De Rating required / 4
FA1H25 / 25 / No De Rating required / 4
FA1H35 / 35 / No De Rating required / 4
FA1H45 / 45 / No De Rating required / 4
FA1H50 / 50 / No De Rating required / 4
FA1H65 / 65 / No De Rating required / 4
FA1H75 / 75 / 71-75 / 1,4
FA1H100 / 100 / 87-100 / 1,4
(2) FA1H65 installed in parallel / 130(both fuses) / No De Rating required / 4
(2) FA1H75 installed in parallel / 150(both fuses) / 142-150(both fuses) / 1,4
(2) FA1H100 installed in parallel / 200(both fuses) / 174-200(both fuses) / 1,4
X-Limiter / 43F008-I / 8 / No De Rating required / 4
43F010-I / 10 / No De Rating required / 4
43F012-I / 12 / No De Rating required / 4
43F018-I / 18 / No De Rating required / 4
43F025-I / 25 / No De Rating required / 4
43F035-I / 35 / No De Rating required / 4
43F045-I / 45 / 39-43 / 1,4
43F050-I / 50 / No De Rating required / 4
43F065-I / 65 / No De Rating required / 4
43F075-I / 75 / 66-73 / 1,4
43F100-I / 100 / 77-85 / 1,4
(2) 43F065-I installed in parallel / 130 (both fuses) / No De Rating required / 2,4
(2) 43F075-I installed in parallel / 150(both fuses) / 132-146(both fuses) / 3,4
(2) 43F100-I installed in parallel / 200(both fuses) / 154-170(both fuses) / 3,4
5.5kV / NX / FA2H6 / 6 / No De Rating required / 4
FA2H8 / 8 / No De Rating required / 4
FA2H10 / 10 / No De Rating required / 4
FA2H12 / 12 / No De Rating required / 4
FA2H18 / 18 / No De Rating required / 4
FA2H20 / 20 / No De Rating required / 4
FA2H25 / 25 / No De Rating required / 4
FA2H35 / 30 / No De Rating required / 4
FA2H45 / 40 / No De Rating required / 4
FA2H50 / 50 / No De Rating required / 4
FA2H65 / 65 / No De Rating required / 4
FA2H75 / 75 / 71-75 / 1,4
(2) FA2H45 installed in parallel / 80 (both fuses) / No De Rating required / 2,4
(2) FA2H50 installed in parallel / 100 (both fuses) / No De Rating required / 2,4
(2) FA2H65 installed in parallel / 130 (both fuses) / No De Rating required / 2,4
(2) FA2H75 installed in parallel / 150 (both fuses) / 142-150(both fuses) / 3,4
X-Limiter / 55F008-I / 8 / No De Rating required / 4
55F010-I / 10 / No De Rating required / 4
55F012-I / 12 / No De Rating required / 4
55F018-I / 18 / No De Rating required / 4
55F020-I / 20 / No De Rating required / 4
55F025-I / 25 / No De Rating required / 4
55F030-I / 30 / No De Rating required / 4
55F040-I / 40 / No De Rating required / 4
55F050-I / 50 / No De Rating required / 4
55F065-I / 65 / 60-65 / 1,4
55F075-I / 75 / 67-74 / 1,4
(2) 55F040-I installed in parallel / 80 (both fuses) / No De Rating required / 2,4
(2) 55F050-I installed in parallel / 100 (both fuses) / No De Rating required / 2,4
(2) 55F065-I installed in parallel / 130 (both fuses) / 120-130(both fuses) / 3,4
(2) 55F075-I installed in parallel / 150 (both fuses) / 134-148(both fuses) / 3,4
8.3kV / NX / FA3H1 / 1.5 / No De Rating required / 4
FA3H3 / 3 / No De Rating required / 4
FA3H4 / 4.5 / No De Rating required / 4
FA3H6 / 6 / No De Rating required / 4
FA3H8 / 8 / No De Rating required / 4
FA3H10 / 10 / No De Rating required / 4
FA3H12 / 12 / No De Rating required / 4
FA3H18 / 18 / No De Rating required / 4
FA3H20 / 20 / No De Rating required / 4
FA3H25 / 25 / No De Rating required / 4
FA3H30 / 30 / No De Rating required / 4
FA3H40 / 40 / No De Rating required / 4
8.3kV / X-Limiter / 83F003-I / 3 / No De Rating required / 4
83F006-I / 6 / No De Rating required / 4
83F008-I / 8 / No De Rating required / 4
83F010-I / 10 / No De Rating required / 4
83F012-I / 12 / No De Rating required / 4
83F018-I / 18 / No De Rating required / 4
83F020-I / 20 / No De Rating required / 4
83F025-I / 25 / No De Rating required / 4
83F030-I / 30 / No De Rating required / 4
83F040-I / 40 / 37-40 / 1,4
83F050-DW / 50 / 42-47 / 1,4
(2) 83F030-I installed in parallel / 60(both fuses) / No De Rating required / 2,4
(2) 83F040-I installed in parallel / 80(both fuses) / 74-80(both fuses) / 3,4
(2) 83F050-DW installed in parallel / 100(both fuses) / 84-94(both fuses) / 3,4
ELX / 3563003M11M / 3 / No De Rating required / 4
3563006M11M / 6 / No De Rating required / 4
3563008M11M / 8 / No De Rating required / 4
3563010M11M / 10 / No De Rating required / 4
3563012M11M / 12 / No De Rating required / 4
3563018M11M / 18 / No De Rating required / 4
3563020M11M / 20 / No De Rating required / 4
3563025M11M / 25 / No De Rating required / 4
3563030M11M / 30 / No De Rating required / 4
3563040M11M / 40 / 37-40 / 1,4
3563050M11M / 50 / 44-50 / 1,4
(2) 3563030M11M installed in parallel / 60(both fuses) / No De Rating required / 2,4
(2) 3563040M11M installed in parallel / 80(both fuses) / 74-80(both fuses) / 3,4
(2) 3563050M11M installed in parallel / 100(both fuses) / 88-100(both fuses) / 3,4
15.5kV / ELX / 3564003M11M / 3 / No De Rating required
3564006M11M / 6 / No De Rating required
3564008M11M / 8 / No De Rating required
3564012M11M / 10 / No De Rating required
3564010M11M / 12 / No De Rating required
3564018M11M / 18 / No De Rating required
3564020M11M / 20 / No De Rating required
3564025M11M / 25 / 23-25 / 1
3564030M11M / 30 / 29-30 / 1
3564040M11M / 40 / 30-35 / 1
3564050M11M / 50 / 35-41 / 1
(2) 3564030M11M installed in parallel / 60(both fuses) / 58-60(both fuses) / 3
(2) 3564040M11M installed in parallel / 80(both fuses) / 60-70(both fuses) / 3
(2) 3564050M11M installed in parallel / 100(both fuses) / 70-82(both fuses) / 3
NX / FA4H1 / 1.5 / No De Rating required
F43H3 / 3 / No De Rating required
FA4H4 / 4.5 / No De Rating required
FA4H6 / 6 / No De Rating required
FA4H8 / 8 / No De Rating required
FA4H10 / 10 / No De Rating required
FA4H12 / 12 / No De Rating required
FA4H18 / 18 / 16-18 / 1
FA4H20 / 20 / 17-20 / 1
FA4H25 / 25 / 22-25 / 1
FA4H30 / 30 / 25-29 / 1
FA4H40 / 40 / 31-36 / 1
(2) FA4H25 installed in parallel / 50(both fuses) / 44-50(both fuses) / 3
(2) FA4H30 installed in parallel / 60(both fuses) / 50-58(both fuses) / 3
(2) FA4H40 installed in parallel / 80(both fuses) / 61-72(both fuses) / 3
X-Limiter / 155F003-I / 3 / No De Rating required
155F006-I / 6 / No De Rating required
155F008-I / 8 / No De Rating required
155F010-I / 10 / No De Rating required
155F012-I / 12 / No De Rating required
155F018-I / 18 / 17-18 / 1
155F020-I / 20 / 18-19 / 1
155F025-I / 25 / 21-23 / 1
155F030-I / 30 / 26-28 / 1
155F040-I / 40 / 30-33 / 1
155F050-DW / 50 / 32-35 / 1
(2) 155F030-I installed in parallel / 60(both fuses) / 54-56(both fuses) / 3
(2) 155F040-I installed in parallel / 80(both fuses) / 60-66(both fuses) / 3
(2) 155F050-DW installed in parallel / 100(both fuses) / 64-70(both fuses) / 3
Cutler Hammer Fuses for G&W 15.2kV rated fuse canisters
Fuse Type / Rated Max Voltage (kV) / Catalog Number / Factory labeled current Rating (Amps) / Approximate De-Rated Continuous Current (Amps) / Notes
CX / 4.3 / 4CX-18C / 18 / No De Rating required / 4
4CX-25C / 25 / No De Rating required / 4
4CX-35C / 35 / No De Rating required / 4
4CX-45C / 45 / No De Rating required / 4
4CX-50C / 50 / No De Rating required / 4
4CX-60C / 60 / 57-60 / 1,4
4CX-65C / 65 / 59-65 / 1,4
4CX-75C / 75 / 65-72 / 1,4
4CX-80C / 80 / 70-80 / 1,4
4CX-100C / 100 / 79-88 / 1,4
(2) 4CX-60C installed in parallel / 120(both fuses) / 114-120(both fuses) / 3,4
(2) 4CX-65C installed in parallel / 130(both fuses) / 118-135(both fuses) / 3,4
(2) 4CX-75C installed in parallel / 150(both fuses) / 130-144(both fuses) / 3,4
(2) 4CX-80C installed in parallel / 160(both fuses) / 140-160(both fuses) / 3,4
(2) 4CX-100C installed in parallel / 200(both fuses) / 158-176(both fuses) / 3,4
CX / 5.5 / 5CX-10C / 10 / No De Rating required / 4
5CX-12C / 12 / No De Rating required / 4
5CX-18C / 18 / No De Rating required / 4
5CX-20C / 20 / No De Rating required / 4
5CX-21C / 21 / No De Rating required / 4
5CX-25C / 25 / No De Rating required / 4
5CX-30C / 30 / No De Rating required / 4
5CX-35C / 35 / No De Rating required / 4
5CX-40C / 40 / No De Rating required / 4
5CX-50C / 50 / No De Rating required / 4
5CX-60C / 60 / 52-60 / 1,4
5CX-65C / 65 / 59-65 / 1,4
5CX-75C / 75 / 66-73 / 1,4
(2) 5CX-40C installed in parallel / 80(both fuses) / No De Rating required / 2,4
(2) 5CX-50C installed in parallel / 100(both fuses) / No De Rating required / 2,4
(2) 5CX-60C installed in parallel / 120(both fuses) / 104-120(both fuses) / 3,4
(2) 5CX-65C installed in parallel / 130(both fuses) / 118-130(both fuses) / 3,4
(2) 5CX-75C installed in parallel / 150(both fuses) / 132-146(both fuses) / 3,4
CX / 8.3 / 8CX-3.5C / 3.5 / No De Rating required / 4
8CX-4C / 4 / No De Rating required / 4
8CX-4.5C / 4.5 / No De Rating required / 4
8CX-6C / 6 / No De Rating required / 4
8CX-7C / 7 / No De Rating required / 4
8CX-8C / 8 / No De Rating required / 4
8CX-10C / 10 / No De Rating required / 4
8CX-12C / 12 / No De Rating required / 4
8CX-15C / 15 / No De Rating required / 4
8CX-18C / 18 / No De Rating required / 4
8CX-20C / 20 / No De Rating required / 4
8CX-25C / 25 / No De Rating required / 4
8CX-30C / 30 / No De Rating required / 4
8CX-35C / 35 / 33-35 / 1,4
8CX-40C / 40 / No De Rating required / 4
(2) 8CX-25C installed in parallel / 50(both fuses) / No De Rating required / 2,4
(2) 8CX-30C installed in parallel / 60(both fuses) / No De Rating required / 2,4
(2) 8CX-35C installed in parallel / 70(both fuses) / 66-70(both fuses) / 3,4
(2) 8CX-40C installed in parallel / 80(both fuses) / No De Rating required / 2,4
CX / 15.5 / 15CX-4C / 4 / No De Rating required
15CX-6C / 6 / No De Rating required
15CX-7C / 7 / No De Rating required
15CX-8C / 8 / No De Rating required
15CX-10C / 10 / No De Rating required
15CX-12C / 12 / No De Rating required
15CX-15C / 15 / No De Rating required
15CX-18C / 18 / No De Rating required
15CX-20C / 20 / No De Rating required
15CX-25C / 25 / No De Rating required
15CX-30C / 30 / 20-24 / 1
15CX-40C / 40 / 21-24 / 1
(2) 15CX-25C installed in parallel / 50(both fuses) / No De Rating required / 2
(2) 15CX-30C installed in parallel / 60(both fuses) / 40-48(both fuses) / 3
(2) 15CX-40C installed in parallel / 80(both fuses) / 42-48(both fuses) / 3
Thomas and Betts Fuses for G&W 15.2kV rated fuse canisters
Fuse Type / Rated Max Voltage (kV) / Catalog Number / Factory labeled current Rating (Amps) / Approximate De-Rated Continuous Current (Amps) / Notes
FX / 8.8 / HTFX230065 / 65 / 58-63 / 1
HTFX230080 / 80 / 64-70 / 1
(2) HTFX230065 installed in parallel / 130 (both fuses) / 116-126 (both fuses) / 3
(2) HTFX230080 installed in parallel / 160 (both fuses) / 128-140 (both fuses) / 3
FX / 10 / HTFX230003 / 3 / No De Rating required / 4
HTFX230006 / 6 / No De Rating required / 4
HTFX230008 / 8 / No De Rating required / 4
HTFX230010 / 10 / No De Rating required / 4
HTFX230012 / 12 / No De Rating required / 4
HTFX230018 / 18 / No De Rating required / 4
HTFX230020 / 20 / No De Rating required / 4
HTFX230025 / 25 / No De Rating required / 4
HTFX230030 / 30 / No De Rating required / 4
HTFX230040 / 40 / No De Rating required / 4
HTFX230050 / 50 / 45-50 / 1,4
(2) HTFX230030 installed in parallel / 60(both fuses) / No De Rating required / 2,4
(2) HTFX230040 installed in parallel / 80(both fuses) / No De Rating required / 2,4
(2) HTFX230050 installed in parallel / 100(both fuses) / 90-100(both fuses) / 3,4
FX / 17.2 / HTFX240003 / 3 / No De Rating required / 4
HTFX240006 / 6 / No De Rating required / 4
HTFX240008 / 8 / No De Rating required / 4
HTFX240010 / 10 / No De Rating required / 4
HTFX240012 / 12 / No De Rating required / 4
HTFX240018 / 18 / No De Rating required / 4
HTFX240020 / 20 / No De Rating required / 4
HTFX240025 / 25 / No De Rating required / 4
HTFX240030 / 30 / 27-30 / 1,4
HTFX240040 / 40 / 32-35 / 1,4
HTFX240050 / 50 / 35-38 / 1,4
(2) HTFX240030 installed in parallel / 60(both fuses) / 54-60(both fuses) / 3,4
(2) HTFX240040 installed in parallel / 80(both fuses) / 64-70(both fuses) / 3,4
(2) HTFX240050 installed in parallel / 100(both fuses) / 70-76(both fuses) / 3,4