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)

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

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

FUSE-HLDR-14-01   Fuse holder, 14 mm, 1 position Buy
FUSE-HLDR-22-01   Fuse holder, 22 mm, 1 position Buy

Click picture for a close up view:


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   I²T Fuse, L bracket style, 35 amp Buy
FUSE-SEMIBR-63A   I²T Fuse, L bracket style, 63 amp Buy
FUSE-SEMIBR-100   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  
125 Amp I2T FUSE  
175 Amp I2T FUSE  
Free Standing Thermal Block for Large Fuses  

Bussman fuse

Large 125-200 Amp Fuses

ferraz fuse replacement

Large Fuse Holders

For a detailed photos of I2T fuses and fuse holders: i2t_fuse and fuse holder.


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