Littelfuse

Littelfuse L50QS040 40A 500V aR High-Speed Fuse

Name: Littelfuse L50QS040 40A 500V aR High-Speed Fuse
Brand: Littelfuse
SKU: L50QS040

Part Number: L50QS040

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Littelfuse L50QS040 pairs a 40A rating with 500V AC/DC very-fast-acting protection for power electronics.

Rated Current40A

Rated Voltage500V AC/DC

Breaking Capacity200kA AC / 50kA DC

PackageTraditional Round Body

Tags

40A 500V aR High-Speed Fuse L50QS Series L50QS040 Littelfuse

With a 40A rating at 500V AC/DC, Littelfuse L50QS040 is an L50QS round-body high-speed fuse for sensitive power-semiconductor circuits. Its very-fast-acting Class aR design is rated 200kA AC and 50kA DC, with 137 A²s pre-arcing I²t and 530 A²s total clearing I²t at 500VAC. Confirm system-level suitability against the manufacturer technical data. For cross-reference work, compare its voltage rating before the series designation, and verify the terminal style against the Littelfuse technical sheet.

Technical Specifications

Part Number: L50QS040
Manufacturer Part Number: L50QS040
Series: L50QS Series
Fuse Type: High-Speed Round-Body Semiconductor Fuse
Current Rating: 40A
Voltage Rating: 500V AC/DC
AC / DC: AC/DC
Breaking Capacity: 200kA AC / 50kA DC
I²t: 530 A²s total @ 500VAC; 363 A²s @ 500VDC
Pre-arcing I²t: 137 A²s
Total I²t: 530
Operating Temperature: -55°C to +125°C
Package / Dimensions: Traditional Round Body
Mounting: Bolt-Down
Application: Control circuits · Power Electronics · UPS · Variable Speed Drives
Standard: IEC 60269-4
Terminal Type: Bolted Tags
Fuse Speed: Very Fast Acting
Utilization Class: aR
Approvals: RoHS · UL Recognized
Certifications: UL Recognized · cURus · RoHS · REACH
Body: Melamine
Caps: Silver-plated copper alloy
Total clearing I²t: 530 A²s @ 500VAC; 363 A²s @ 500VDC