I²T fuses for solid state relays

We recommend fuse protection through the use of properly selected I2t fusing (semiconductor fuses). Devices such as circuit breakers and general purpose fuses, while sufficient and necessary for load and installation protection, do not provide adequate protection for the semiconductor device.

Part Numbers

The part number shows the physical size of the fuse (14 mm or 22 mm diameter) and the amperage of the fuse. The FUSE-HLDR fuse holders are finger safe, din rail units.

Ferrule style fuses: (to be installed in the finger safe fuse block listed below.) Manufactured by Cooper Bussmann.

FUSE-EXT-14-25 Bussmann FWP-25A14Fa, I²T Fuse, 14 mm x 51 mm, 25 amp Buy
FUSE-EXT-14-30 Bussmann FWP-30A14Fa, I²T Fuse, 14 mm x 51 mm, 30 amp Buy
FUSE-EXT-14-40 Bussmann FWP-40A14Fa, I²T Fuse, 14 mm x 51 mm, 40 amp Buy
FUSE-EXT-14-50 Bussmann FWP-50A14Fa, I²T Fuse, 14 mm x 51 mm, 50 amp Buy
FUSE-EXT-22-80 Bussmann FWP-80A22F, I²T Fuse, 22 mm x 58 mm, 80 amp Buy
FUSE-EXT-22-100 Bussmann FWP-100A22F, I²T Fuse, 22 mm x 58 mm, 100 amp Buy

Din Rail, Finger-Safe, Fuse Blocks for Ferrule Style Fuses:

FUSE-HLDR-14-01 Bussmann CH141D Fuse holder, 14 mm, 1 position Buy
FUSE-HLDR-22-01 Bussmann CH221B Fuse holder, 22 mm, 1 position Buy
FUSE-HLDR-14-03 Bussmann CH143D Fuse holder, 14 mm, 3 position Buy


Finger-Safe Fuse Blocks and ferrule style fuse

L Bracket Style Fuses (installs inside the DDA-6V50, DDA-6V75, DDA-100 or DAA-6V50, DAA-6V75, DAA-6V100)

FUSE-SEMIBR-35A Bussmann 35FE I²T Fuse, L bracket style, 35 amp Buy
FUSE-SEMIBR-63A Bussmann 63FE I²T Fuse, L bracket style, 63 amp Buy
FUSE-SEMIBR-100 Bussmann 100FE I²T Fuse, L bracket style, 100 amp Buy

i2t fuse

L Bracket Fuse

Large I²T Fuses and Terminal Blocks: (for bolt-down applications)

100 Amp I2T FUSE Bussmann FWP-100B Buy
125 Amp I2T FUSE Bussmann FWP-125A Buy
175 Amp I2T FUSE Bussmann FWP-175A Buy
Free Standing Thermal Block for Large Fuses Bussmann C5268-1 Buy

Bussman fuse

Large 125-200 Amp Fuses

ferraz fuse replacement

Large Fuse Holders

For a printable copy of the data bulletin including the complete specifications: I²T fuses, fuse blocks and I2T fuse accessories