

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
- 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
L75QS Parts
Filters
Part Number | Actions | Current Rating (Continuous) in Amps | Interrupting Rating | Opening | Voltage Rating (V) | Agency Approvals |
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Part Number | Actions | Current Rating (Continuous) in Amps | Interrupting Rating
| Opening | Voltage Rating (V) | Agency Approvals | |
---|---|---|---|---|---|---|---|
35 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / ROHS / UR / Rohs / CUR | |||
40 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / UR / ROHS / Rohs / CUR | |||
50 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / ROHS / UR / Rohs / CUR | |||
60 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | UR / ROHS / CUR / Rohs / CE | |||
70 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / ROHS / UR / Rohs / CUR | |||
80 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / ROHS / UR / Rohs / CUR | |||
90 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / UR / ROHS / Rohs / CUR | |||
100 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / UR / Rohs / CUR / ROHS | |||
125 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / UR / ROHS / CUR / Rohs | |||
150 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / ROHS / UR / Rohs / CUR | |||
175 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | CE / ROHS / UR / Rohs / CUR | |||
200 | 50 kA @ 750 Vdc | Very Fast-Acting (FF) | 750 | ROHS / Rohs / UR / CE / CUR |
L75QS Applications
- Power converters (inverters, rectifiers)
- Power supplies, UPS
- EV charging stations
- Variable speed drives
- Dc common bus systems