Littelfuse 0LKS045.S Equivalent & Substitute Parts

Part Overview

The Littelfuse 0LKS045.S is a 45A 600VAC cartridge fuse link from the POWR-GARD® LKS series, designed for electrical and industrial applications requiring fast-blow protection. This part is classified as obsolete, making identification of compatible substitutes essential for system maintenance and component replacement. The fuse link requires a holder for installation and operates at a breaking capacity of 10kA at rated voltage.

Substiute Parts

0LKS045.S

Littelfuse Inc.In Stock: 10830LKS045.S Datasheet

Current PartRFQ

KLSR045.T

Littelfuse Inc.In Stock: 770KLSR045.T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0LKS045.S is determined by the following critical parameters:

• Current Rating: 45A (must match exactly)
• Voltage Rating - AC: 600 VAC (must match or exceed)
• Response Time: Fast Blow (must match)
• Mounting Type: Requires Holder (must match)
• Fuse Type: Cartridge format (must be compatible with existing holder)
• Approval Agencies: CE, CSA, UL certification required

The KLSR045.T substitute meets these core requirements while offering enhanced specifications including dual voltage capability (600 VAC / 300 VDC), higher breaking capacity, and active product status with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The KLSR045.T is the manufacturer-recommended substitute for the obsolete 0LKS045.S. Both parts maintain identical current and AC voltage ratings with matching fast-blow response characteristics and equivalent approval certifications (CE, CSA, UL). The KLSR045.T offers superior specifications including higher breaking capacity (200kA AC versus 10kA), dual voltage capability (600 VAC / 300 VDC), and active product status ensuring continued availability. The KLSR045.T achieves RoHS3 compliance, addressing environmental regulatory requirements. Physical dimensions differ slightly in length (139.70mm versus 107.90mm), requiring verification of holder compatibility before installation.

Frequently Asked Questions (FAQ)

Q: Can the KLSR045.T directly replace the 0LKS045.S in existing installations?

A: The KLSR045.T maintains the same current rating (45A), AC voltage rating (600 VAC), response time (fast blow), and holder mounting requirement. However, the increased length (139.70mm versus 107.90mm) requires confirmation that the existing fuse holder accommodates the longer cartridge before installation.

Q: What is the significance of the class change from H to RK1?

A: Class H and Class RK1 are distinct fuse classifications with different breaking capacities and application profiles. The KLSR045.T's RK1 classification provides substantially higher breaking capacity (200kA AC) compared to the 0LKS045.S (10kA), making it suitable for higher fault current environments while maintaining the same current and voltage ratings.

Q: Does the KLSR045.T's RoHS3 compliance affect electrical performance?

A: RoHS3 compliance indicates adherence to environmental and material restrictions but does not alter the electrical performance characteristics. The KLSR045.T maintains identical current and voltage ratings with enhanced breaking capacity specifications.

Q: Why is the KLSR045.T longer than the original part?

A: The increased length of the KLSR045.T (139.70mm) is associated with its higher breaking capacity rating (200kA AC). Physical dimensions must be verified against the existing fuse holder specifications to ensure mechanical compatibility.

Q: Are both parts certified by the same approval agencies?

A: Yes, both the 0LKS045.S and KLSR045.T carry CE, CSA, and UL certifications, ensuring compliance with equivalent safety and performance standards across major regulatory jurisdictions.