HIGH-SPEED SEMICONDUCTOR FUSES CATALOG
POWR-SPEED
®
PRODUCTS
HIGH-SPEED FUSES
FUSE BLOCKS & HOLDERS
MICROSWITCHES
FAST-ACTING FUSES
NEW PSR Series High-Speed Square-Body Fuses
Now available in case sizes 70 and 73
Plus, expanded ratings for case sizes 71 and 72
POWR-SPEED
®
Fuse Catalog
TABLE OF CONTENTS
INTRODUCTION
POWR-SPEED
®
High-Speed Semiconductor Fuses .......................................2
UL ACCESSORIES
Class J Blocks ................................................................................................30
Class T Blocks .................................................................................................31
Class CC / Midget Holders .............................................................................32
POWR-SPEED
®
PRODUCTS
High-Speed Square-Body Fuses
PSR Series ........................................................................................................4
High-Speed Round-Body Fuses
L70QS Series.....................................................................................................8
L50QS Series...................................................................................................11
L70S Series .....................................................................................................14
L50S Series .....................................................................................................16
L15S / L25S / L60S / KLC Series ....................................................................18
CROSS REFERENCE GUIDE
POWR-SPEED
®
Fuse Cross Reference ...........................................................33
POWR-SPEED
®
ACCESSORIES
LSCR Series High-Speed Fuse Blocks ............................................................20
MS Series High-Speed Microswitches ..........................................................23
FAST-ACTING PRODUCTS
UL Class L
LDC Series POWR-PRO
®
Fuses ......................................................................25
UL Class J
JLS Series Fuses .............................................................................................26
UL Class T
JLLN / JLLS Series Fuses ...............................................................................27
UL Class CC / Midget
KLKR / KLKD Series Fuses ..............................................................................28
Telecommunications
L17T / TLS Series Telecom Power Fuses .......................................................29
© 2018 Littelfuse High Speed Products Catalog
1
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Introducing
POWR-SPEED
High-Speed
®
Silver-Plated Copper
Alloy End Bells
Fiberglass
Melamine Body
100% Pure
Silver Elements
Stone-Sand Filled
*not shown
Drill Pins
OPTIMIZED FOR PERFORMANCE AND EFFICIENCY
These certified high-speed fuses are optimized for performance and efficiency to better
protect your critical power semiconductors against short circuits. How is POWR-SPEED
better? Backed by over 40 years of experience, Littelfuse engineered the POWR-Speed
line to help you protect critical power electronics from overcurrents that may cause
damage to your equipment. High-speed fuses are reliable, very fast-acting products
that can reduce the amount of short circuit current and improve the life of your power
semiconductor devices.
The POWR-SPEED High-Speed Fuses are easy to retrofit as drop-in replacements
where similar products are currently being used. Custom designs are available if you
need a specific fuse for your application. Call us. Our engineers are eager to partner
with you before, during, and long after the design process to meet your specific needs.
littelfuse.com/powr-speed
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© 2018 Littelfuse High Speed Products Catalog
Semiconductor Fuses
Silver-Plated Copper
Alloy End Bell
Copper Alloy
End Plates
Alumina High-Grade
Ceramic Body
Stone Sand
Silver-Copper
Through-Lay Elements
100% Pure Silver
Element Bridges
Features
Extremely Current Limiting
Low Watt Loss
*Resilient Labeling
**All Ratings Published on Label
Universal Mounting
Optimized Design
**Flush End Terminals
RoHS and REACH Compliant
Optimized Performance
**Silicone Sealant
**High DC Interrupting Rating
*Round-body style only
**Square-body style only
Benefits
Reduces peak let-through current and let-through energy (I2t) to protect semiconductor components and devices
Saves energy wasted during operation
Laser etched resistance values eliminate labels that erode over time
Eliminates confusion when replacing and inspecting
Quick and easy field replacement
Better energy efficiency and improved protection levels
Flexibility to mount directly to bus-bar
Environment friendly, offering greater acceptance in global power electronics
Balanced speed of operation, energy efficiency, and longevity
Prevents sand leakage and improves reliability
Achieves an interrupting rating of 150kA for applications that require more power
© 2018 Littelfuse High Speed Products Catalog
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littelfuse.com/powr-speed
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