Description
The L70QS 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.
L70QS 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 L70QS 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.

Features
 Compliance with US and Canadian requirements  Traditional North American bolted style dimensions
 Class aR performance  Direct bus-bar mount or stud mount design
 Halogen free, RoHS and REACH Compliant

Applications
 Power converters (inverters, rectifiers)
 Power supplies
 UPS
 Variable speed drives
 Control circuits
 Soft starters

Specifications
Voltage Rating Ac: 700 V
Dc: 700 V
Amperage Rating 35–800 A
Interrupting Rating Ac: 200 kA
Dc: 50 kA
Time Constant 10 ms
Material Body: melamine
Caps: copper alloy (silver plated)
Approvals UL Recognized (E71611)
cURus (E71611)
Environmental RoHS Compliant, REACH
Country of Origin Mexico
Operating Temperature -55 °C to +125 °C
Storage Temperature Up to 35 °C with relative humidity <65 %