L50QS Series - High-Speed Round Body Fuses

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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 L50QS Series is a next generation High-Speed Fuse for the protection of power semiconductor devices and is designed in the Traditional North American Bolted Style package.

L50QS Series High-Speed Fuses are extremely current limiting and are used to protect power converters, drives and control circuit applications. Designed with lower I2t performance characteristics, these fuses provide balanced performance to extend longevity while lowering potentially damaging heat energy to the devices being protected.

In addition L50QS Series fuses have been designed with a universal mounting option to meet customer requirements for installation into a variety of application configurations Littelfuse POWR-SPEED™ products offer optimized circuit protection at the extremely fast speed required to protect modern day, sensitive, high-power semiconductor devices. Such products are commonly found in various industries including pulp and paper industries, cranes and heavy-lifting equipment, processing industries, wastewater treatment plants and large factories and MRO facilities.

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VAC (V)VDC (V)Interrupting RatingOpeningStockSamplesCompare
L50QS03535500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS04040500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS05050500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS06060500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS07070500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS08080500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS09090500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS100100500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS125125500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS150150500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS175175500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS200200500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS225225500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS250250500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS275275500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS300300500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS325325500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS350350500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS400400500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS450450500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS500500500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS600600500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS700700500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
L50QS800800500500200 kA @ 500 VacVery Fast-Acting (FF)CheckOrder
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
L50QS035.T FUS 500V SEMICONDUCTOR 35A RoHS No 08/12/2016 PbFree No 08/12/2016 CoC_RoHS9_L50QS035.T_05-28-2020 REACH209_Declaration_-Contain-_L50QS035.T_08-04-2020 Yes
08/12/2016
Contains
L50QS040.T FUS 500V SEMICONDUCTOR 40A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS050.T FUS 500V SEMICONDUCTOR 50A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS050.T_08-17-2017 REACH197_Declaration_with_Pb_L50QS050.T_02-05-2019 Yes
01/22/2017
Contains
L50QS060.T FUS 500V SEMICONDUCTOR 60A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS070.T FUS 500V SEMICONDUCTOR 70A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS080.T FUS 500V SEMICONDUCTOR 80A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS080.T_02-20-2020 REACH205_Declaration_with_Pb_L50QS080.T_02-20-2020 Yes
01/22/2017
Contains
L50QS090.T FUS 500V SEMICONDUCTOR 90A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS100.T FUS 500V SEMICONDUCTOR 100A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS125.V FUS 500V SEMICONDUCTOR 125A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS125.V_11-26-2020 REACH209_Declaration_-Contain-_L50QS125.V_11-26-2020 Yes
01/22/2017
Contains
L50QS150.V FUS 500V SEMICONDUCTOR 150A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS150.V_10-09-2020 REACH209_Declaration_-Contain-_L50QS150.V_10-09-2020 Yes
01/22/2017
Contains
L50QS175.V FUS 500V SEMICONDUCTOR 175A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS175.V_03-15-2021 REACH211_Declaration_-Contain-_L50QS175.V_03-15-2021 Yes
01/22/2017
Contains
L50QS200.V FUS 500V SEMICONDUCTOR 200A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS200.V_12-07-2020 REACH209_Declaration_-Contain-_L50QS200.V_12-07-2020 Yes
01/22/2017
Contains
L50QS225.V FUS 500V SEMICONDUCTOR 225A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS250.V FUS 500V SEMICONDUCTOR 250A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS250.V_05-18-2020 REACH205_Declaration_-Contain-_L50QS250.V_05-18-2020 Yes
01/22/2017
Contains
L50QS275.V FUS 500V SEMICONDUCTOR 275A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS300.V FUS 500V SEMICONDUCTOR 300A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS300.V_02-21-2020 REACH209_Declaration_-Contain-_L50QS300.V_09-08-2020 Yes
01/22/2017
Contains
L50QS325.V FUS 500V SEMICONDUCTOR 325A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS350.V FUS 500V SEMICONDUCTOR 350A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS350.V_11-26-2020 REACH209_Declaration_-Contain-_L50QS350.V_11-26-2020 Yes
01/22/2017
Contains
L50QS400.V FUS 500V SEMICONDUCTOR 400A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS400.V_11-26-2020 REACH209_Declaration_-Contain-_L50QS400.V_11-26-2020 Yes
01/22/2017
Contains
L50QS450.X FUS 500V SEMICONDUCTOR 450A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
L50QS500.X FUS 500V SEMICONDUCTOR 500A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS500.X_11-26-2020 REACH209_Declaration_-Contain-_L50QS500.X_11-26-2020 Yes
01/22/2017
Contains
L50QS600.X FUS 500V SEMICONDUCTOR 600A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS600.X_11-18-2019 REACH201_Declaration_with_Pb_L50QS600.X_11-18-2019 Yes
01/22/2017
Contains
L50QS700.X FUS 500V SEMICONDUCTOR 700A RoHS No 01/22/2017 PbFree No 01/22/2017 CoC_RoHS9_L50QS700.X_11-18-2019 REACH201_Declaration_with_Pb_L50QS700.X_11-18-2019 Yes
01/22/2017
Contains
L50QS800.X FUS 500V SEMICONDUCTOR 800A RoHS No 01/22/2017 PbFree No 01/22/2017 Yes
01/22/2017
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