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
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Body Style
Current Rating
Voltage Rating AC
Voltage Rating DC
Interrupt Rating
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Fuse Size/Group
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Littelfuse Specialty Fuses POWR-SPEED SQB SIZE 70 US LONG BL 200A
Datasheet
13In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box
Littelfuse Specialty Fuses POWR-SPEED SQB SIZE 72 DIN 110MM 500A
Datasheet
7In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 500 A 1.3 kVAC 1 kVDC 100 kA, 150 kA Screw Blade / Boltdown Fast Blow 72 Visual Side Indicator Box
Littelfuse Specialty Fuses POWR-SPEED SQB Size 32 US LONG BL 400A
Datasheet
2In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box
Littelfuse Specialty Fuses POWR-SPEED SQB SIZE 70 US LONG BL 80A
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box
Littelfuse Specialty Fuses 700A 700V SIZE 31 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 700 A 700 VAC 600 VDC Holder Quick Connect Fast Blow 31 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 350A 700V SIZE 31 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 350 A 700 VAC 600 VDC Holder Quick Connect Fast Blow 31 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 250A 700VAC SIZE 30 POWER-SPEED FLUSH M
Datasheet
6In Stock
Min.: 1
Mult.: 1

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

PSR Specialty Fuses Square Body Fuses 400 A 1.3 kVAC 1 kVDC Snap In Quick Connect Fast Blow 71 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 125A 700VAC SIZE 30 POWER-SPEED FLUSH M
Datasheet
9In Stock
Min.: 1
Mult.: 1

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

PSR Specialty Fuses Square Body Fuses 280 A 1.3 kVAC 1 kVDC 100 kA, 150 kA Stud Threaded Stud Fast Blow 70 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 900V FAST BLOW 800A
Datasheet
9In Stock
Min.: 1
Mult.: 1
PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box
Littelfuse Specialty Fuses POWR-SPEED SQB SIZE 70 DIN 110MM 50A
Datasheet
45In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 50 A 1.3 kVAC 1 kVDC 100 kA, 150 kA Screw Blade / Boltdown Fast Blow 70 Visual Side Indicator Box
Littelfuse Specialty Fuses 630A 1250VAC SIZE 72 POWER-SPEED FLUSH M
Datasheet
4In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 630 A 1.3 kVAC 1 kVDC Snap In Quick Connect Fast Blow 72 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 80A 1000V SIZE 70 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

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

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

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

PSR Specialty Fuses Square Body Fuses 200 A 1.3 kVAC 1 kVDC 100 kA, 150 kA Stud Threaded Stud Fast Blow 70 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 700A 1250V SIZE 73 Flush End Mtrc Thred
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 700 A 1.3 kVAC 1 kVDC 100 kA, 150 kA Stud Threaded Stud Fast Blow 73 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 700A 1250V SIZE 73 Flush End In Thread
Datasheet
1In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 700 A 1.3 kVAC 1 kVDC 100 kA, 150 kA Stud Threaded Stud Fast Blow 73 Visual Side Indicator Bulk
Littelfuse Specialty Fuses 800A 700V SIZE 33 Flush End Mtrc Thred
Datasheet
3In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 800 A 700 VAC 600 VDC Holder Quick Connect Fast Blow 33 Visual Side Indicator Bulk
Littelfuse Specialty Fuses POWR-SPEED SQB SIZE 70 US LONG BL 250A
Datasheet
2In Stock
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box
Littelfuse Specialty Fuses POWR-SPEED SQB SIZE 70 US LONG BL 50A
Datasheet
4Expected 18/02/2026
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box
Littelfuse Specialty Fuses 1000V SIZE 70 LONG BL 100A
Datasheet
96Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box
Littelfuse Specialty Fuses 315A 1250VAC SIZE 71 POWER-SPEED FLUSH M
Datasheet
582Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Fuses 315 A 1.3 kVAC 1 kVDC Snap In Quick Connect Fast Blow 71 Visual Side Indicator Bulk
Littelfuse Specialty Fuses POWR-SPEED SQB SIZE 73 US LONG BL 315A
Datasheet
469Factory Stock Available
More Info Available
Min.: 1
Mult.: 1

PSR Specialty Fuses Square Body Blade Fuses Screw Knife Blade Fast Blow Visual Blown Fuse Box