PSR High-Speed Square Body Fuses

Littelfuse PSR Series High-Speed Square Body Fuses are specially designed for the protection of power semiconductor devices. The fuses from Littelfuse combine extreme current limitation benefits with balanced performance levels to meet the precise requirements for protecting sensitive power electronics devices. These devices include diodes, triacs, IGBTs, SCRs, MOSFETs, and other solid-state devices that are typically designed for power conversion and power conditioning equipment.

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Qty. RoHS ECAD Model Series
Product
Current Rating
Voltage Rating AC
Fuse Type
Voltage Rating DC
Interrupt Rating
Body Style
Mounting Style
Termination Style
Fuse Size/Group
Indicator Style
Packaging
Littelfuse Industrial & Electrical Fuses 630A 1250VAC SIZE 72 POWER-SPEED FLUSH M
Datasheet
4In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 630 A 1.3 kVAC Fast Blow 1 kVDC Square Body Blade Fuses Snap In Quick Connect 72 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 900V FAST BLOW 700A
Datasheet
4In Stock
3Expected 6/25/2026
Min.: 1
Mult.: 1

PSR Specialty Fuses 700 A Fast Blow Square Body Blade Fuses Screw Knife Blade 73 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB SIZE 70 US LONG BL 50A
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 50 A Fast Blow Square Body Blade Fuses Screw Knife Blade 70 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses 350A 700V SIZE 31 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 350 A 700 VAC Fast Blow 600 VDC Square Body Blade Fuses Holder Quick Connect 31 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB Size 32 US LONG BL 400A
Datasheet
2In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 400 A Fast Blow Square Body Blade Fuses Screw Knife Blade 32 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses 125A 700VAC SIZE 30 POWER-SPEED FLUSH M
Datasheet
9In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 125 A 700 VAC Fast Blow 600 VDC Square Body Blade Fuses Snap In Quick Connect 30 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 280A 1000V SIZE 70 Flush End Mtrc Thred
Datasheet
3In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 280 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Stud Threaded Stud 70 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 250A 700VAC SIZE 30 POWER-SPEED FLUSH M
Datasheet
6In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 250 A 700 VAC Fast Blow 600 VDC Square Body Blade Fuses Snap In Quick Connect 30 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 400A 1250VAC SIZE 71 POWER-SPEED FLUSH M
Datasheet
4In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 400 A 1.3 kVAC Fast Blow 1 kVDC Square Body Blade Fuses Snap In Quick Connect 71 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 900V FAST BLOW 800A
Datasheet
7In Stock
Min.: 1
Mult.: 1
PSR Specialty Fuses 800 A Fast Blow Square Body Blade Fuses Screw Knife Blade 73 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB SIZE 70 US LONG BL 200A
Datasheet
9In Stock
9Expected 6/1/2026
Min.: 1
Mult.: 1

PSR Specialty Fuses 200 A Fast Blow Square Body Blade Fuses Screw Knife Blade 70 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB SIZE 70 DIN 110MM 50A
Datasheet
31In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 50 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Screw Blade / Boltdown 70 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 900V FAST BLOW 350A
Datasheet
6In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 350 A Fast Blow Square Body Blade Fuses Screw Knife Blade 70 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB SIZE 72 DIN 110MM 500A
Datasheet
5In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 500 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Screw Blade / Boltdown 72 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 1000V SIZE 70 LONG BL 100A
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 100 A Fast Blow Square Body Blade Fuses Screw Knife Blade 70 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses 80A 1000V SIZE 70 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 80 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Stud Threaded Stud 70 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 200A 1000V SIZE 70 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 200 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Stud Threaded Stud 70 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 250A 1000V SIZE 70 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 250 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Stud Threaded Stud 70 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 200A 1000V SIZE 70 Flush End In Thread
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 200 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Stud Threaded Stud 70 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB SIZE 70 US LONG BL 250A
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 250 A Fast Blow Square Body Blade Fuses Screw Knife Blade 70 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses 700A 1250V SIZE 73 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 700 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Stud Threaded Stud 73 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses 700A 700V SIZE 31 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 700 A 700 VAC Fast Blow 600 VDC Square Body Blade Fuses Holder Quick Connect 31 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB SIZE 70 US LONG BL 80A
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 80 A Fast Blow Square Body Blade Fuses Screw Knife Blade 70 Visual Blown Fuse Bulk
Littelfuse Industrial & Electrical Fuses 700A 1250V SIZE 73 Flush End In Thread
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses 700 A 1.3 kVAC Fast Blow 1 kVDC 100 kA, 150 kA Square Body Blade Fuses Stud Threaded Stud 73 Visual Side Indicator Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB SIZE 33 DIN 80MM 500A
Datasheet
Non-Stocked Lead-Time 11 Weeks
Min.: 1
Mult.: 1

PSR Specialty Fuses 500 A 700 VAC Fast Blow 600 VDC 150 kA, 200 kA Square Body Blade Fuses Screw Blade / Boltdown 33 Visual Side Indicator Bulk