ESR POWR-SPEED® High-Speed Square Body Fuses

Littelfuse Energy Storage Rack (ESR) POWR-SPEED® High-Speed Square Body Fuses are designed to protect battery racks in energy storage systems, inverters, and many other DC applications. Littelfuse ESR 1500VDC High-Speed Square Body Fuses are extremely fast-acting and respond quickly to various fault currents to safeguard the battery module or other devices. This Class aBat partial range fuse has superior short circuit protection and a low minimum breaking capacity (from 300% or 3 times the fuse's rated current to 175kA or 250kA self-certified) to cover a range of over-currents that traditional high-speed partial range fuses do not protect against. The ESR fuse safely interrupts most faults in a battery storage system to avoid catastrophic failures and costly shutdowns.    

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Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB ESR 1500VDC 1XL BOLT 125A
Datasheet
4In Stock
Min.: 1
Mult.: 1

ESR Specialty Fuses 125 A 1.5 kVDC 175 kA Solder Lug Bulk
Littelfuse Industrial & Electrical Fuses POWR-SPEED SQB ESR 1500VDC 1XL DIN 125A
Datasheet
23In Stock
Min.: 1
Mult.: 1

ESR Specialty Fuses 125 A 1.5 kVDC 175 kA Solder Lug Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 250A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 250 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 315A
Datasheet
3Expected 5/18/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 315 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 350A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 350 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 400A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 400 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 450A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 450 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 500A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 500 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 550A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 550 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL DIN 630A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 630 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 250A
Datasheet
3Expected 4/21/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 250 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 315A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 315 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 350A
Datasheet
3Expected 5/25/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 350 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 400A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 400 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 450A
Datasheet
3Expected 4/21/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 450 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 500A
Datasheet
3Expected 4/21/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 500 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 550A
Datasheet
3Expected 4/30/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 550 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk
Littelfuse Industrial & Electrical Fuses Specialty Fuses POWR-SPEED SQB ESR 1500VDC 3XL BOLT 630A
Datasheet
3Expected 4/21/2026
Min.: 1
Mult.: 1

Battery Protection Fuse 630 A Fast Blow 1.5 kVDC 250 kA Square Body Blade Fuses DIN Knife Blade 73.5 mm x 73.5 mm x 128.7 mm Bulk