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Littelfuse

Littelfuse L50S040 40A 500V aR High-Speed Semiconductor Fuse

Part Number: L50S040

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Rated for semiconductor protection, Littelfuse L50S040 combines a 40A rating with 500V AC / 450V DC and 200kA @ 500VAC interrupting capability in the L50S high-speed family.

Rated Current40A
Rated Voltage500V AC / 450V DC
Breaking Capacity200kA @ 500VAC; 20kA @ 450VDC
PackageNorth American Bolted Style

For rated-current coordination, Littelfuse L50S040 provides 40A protection at 500V AC / 450V DC with 200kA @ 500VAC; 20kA @ 450VDC capability. The L50S construction is a very fast acting, Class aR semiconductor fuse using bolt-down mounting and bolted tags terminals. Typical use includes power electronics, power supplies, semiconductor protection. Published energy data for this rating includes Pre-arcing 161 A²s; Total 1550 A²s @ 500VAC / 525 A²s @ 450VDC. Check ambient derating and available fault current against the manufacturer data before final selection. When substituting, keep the operating speed and body style aligned with the original device.

Technical Specifications

Part Number
L50S040
Manufacturer Part Number
L50S040
Series
L50S Series
Fuse Type
Traditional High-Speed Semiconductor Fuse
Current Rating
40A
Voltage Rating
500V AC / 450V DC
AC / DC
AC/DC
Breaking Capacity
200kA @ 500VAC; 20kA @ 450VDC
I²t
Pre-arcing 161 A²s; Total 1550 A²s @ 500VAC / 525 A²s @ 450VDC
Pre-arcing I²t
161 A²s
Total I²t
1550 A²s @ 500V AC; 525 A²s @ 450V DC
Operating Temperature
-55°C to +125°C
Package / Dimensions
North American Bolted Style
Mounting
Bolt-Down
Application
Power Electronics · Power supplies · Semiconductor protection
Standard
IEC 60269-4
Terminal Type
Bolted Tags
Fuse Speed
Very Fast Acting
Utilization Class
aR
Approvals
CSA Recognized · RoHS · UL Recognized
Certifications
UL Recognized · CSA Recognized · RoHS
AC Voltage Rating
500V AC
DC Voltage Rating
450V DC

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