L75QS Series – High-Speed Semiconductor Fuse, Round Body Series - Littelfuse L75QS High-Speed Fuses Provide Superior Protection

POWR-Speed Overcurrent Protection Fundamentals
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The L75QS series is a POWR-SPEED® next-generation, high-speed fuse used for the protection of power semiconductor devices and is designed in the traditional, round body bolted style package. These fuses protect power converters, drives, and control circuit applications. Designed with lower I2t performance characteristics, the L75QS fuses provide balanced performance to extend longevity while lowering potentially damaging heat energy to the devices being protected. The L75QS series is rated at 750 V dc and is extremely current-limiting. These fuses have been designed with a universal mounting option to meet customer requirements for installation into a variety of application configurations.

POWR-SPEED® brand fuses are optimized for performance and efficiency to help extend equipment life. They offer Littelfuse-developed technology that sets tomorrow’s standards for accuracy, consistent quality, reliability, and predictable performance. Littelfuse engineers have redefined high-speed fuse technology by using advanced metallurgical, polymer, and materials research, mathematical modeling, and computerized statistical analysis.


  • Extremely current-limiting
  • Low energy let-through (I2t)
  • POWR-SPEED® technology
  • Compliance with US and Canadian requirements
  • Traditional North American bolted style dimensions
  • 750 V dc performance
  • Direct bus-bar mount or stud mount design
  • Halogen free, RoHS and REACH compliant

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)Interrupting RatingOpeningVDC (V)StockSamplesCompare
L75QS0353550 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS0404050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS0505050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS0606050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS0707050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS0808050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS0909050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS10010050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS12512550 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS15015050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS17517550 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS20020050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS22522550 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS25025050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS30030050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS35035050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS40040050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS45045050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS50050050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS60060050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS70075050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
L75QS80080050 kA @ 750 VdcVery Fast-Acting (FF)750CheckOrder
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
L75QS125.V 750VDC HIGHSPEED SEMICONDUCTOR FUSE 125A RoHS No 03/11/2020 PbFree No 03/11/2020 CoC_RoHS9_L75QS125.V REACH205_Declaration_Contain-_L75QS125.V Yes
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