Littelfuse 0RLS045.T Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0RLS045.T is a 45A 600VAC fast-blow cartridge fuse from the POWR-GARD® RLS series, designed for electrical and industrial applications requiring holder-mounted protection. This part is classified as obsolete, making identification of compatible substitutes essential for system maintenance and component replacement. The substitute part maintains the same current rating, voltage specification, and physical dimensions while offering enhanced performance characteristics and active product status.

Substiute Parts

0RLS045.T

Littelfuse Inc.In Stock: 9060RLS045.T Datasheet

Current PartRFQ

KLSR045.T

Littelfuse Inc.In Stock: 770KLSR045.T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0RLS045.T with the KLSR045.T is based on the following critical parameters that must remain constant or compatible:

• Current Rating: Both parts rated at 45A
• Voltage Rating - AC: Both rated at 600 VAC
• Response Time: Both are fast-blow fuses
• Fuse Type: Both are cartridge-type fuses
• Mounting Type: Both require holder mounting
• Physical Dimensions: Identical at 1.063" Dia x 5.500" L (27.00mm x 139.70mm)
• Approval Agencies: Both carry CE, CSA, and UL certifications

The KLSR045.T represents an active product alternative that satisfies all electrical and mechanical compatibility requirements for direct substitution in applications originally specified for the 0RLS045.T.

Parameter Comparison

Engineering Selection Recommendations

The KLSR045.T is the designated manufacturer substitute for the obsolete 0RLS045.T. Selection of the KLSR045.T is supported by:

• Active product status ensuring ongoing availability and supply chain continuity
• Identical electrical ratings (45A, 600 VAC) and response characteristics (fast-blow)
• Matching physical form factor and holder compatibility
• Equivalent certification profile (CE, CSA, UL)
• Enhanced breaking capacity (200kA AC versus 10kA) providing superior fault protection
• ROHS3 compliance status meeting current regulatory requirements
• Additional DC voltage rating (300 VDC) expanding application flexibility

The substitute part satisfies all compatibility requirements for direct replacement in existing electrical and industrial protection circuits.

Frequently Asked Questions (FAQ)

Q: Can the KLSR045.T be used as a direct replacement for the 0RLS045.T?

A: Yes. Both parts share identical current ratings (45A), AC voltage ratings (600 VAC), response time (fast-blow), physical dimensions (1.063" Dia x 5.500" L), and holder mounting requirements. All three approval agencies (CE, CSA, UL) certify both parts.

Q: What is the difference between the H and RK1 fuse classes?

A: Class H and Class RK1 are distinct fuse classifications. The KLSR045.T (RK1 class) provides a breaking capacity of 200kA AC compared to the 0RLS045.T (H class) at 10kA. Both classes are approved for the specified voltage and current ratings.

Q: Does the KLSR045.T fit in the same holder as the 0RLS045.T?

A: Yes. Both cartridge fuses have identical physical dimensions (1.063" Dia x 5.500" L / 27.00mm x 139.70mm) and require holder mounting, ensuring mechanical compatibility.

Q: What is the significance of the KLSR045.T having a 300 VDC rating?

A: The 0RLS045.T specification does not include a DC voltage rating. The KLSR045.T adds 300 VDC capability, allowing use in applications with DC circuits while maintaining full AC compatibility at 600 VAC.

Q: Is the KLSR045.T RoHS compliant?

A: Yes. The KLSR045.T is ROHS3 compliant. The 0RLS045.T is listed as RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulatory requirements.

Q: Why is the 0RLS045.T marked as obsolete?

A: Product obsolescence indicates the part is no longer in active production. The KLSR045.T serves as the active equivalent, ensuring continued availability for replacement and new installations.