KLM-1/4 Equivalent & Substitute Parts

Part Overview

The KLM-1/4 is a 250mA fast-blow fuse cartridge manufactured by Eaton - Bussmann Electrical Division, rated for 600 VAC and 600 VDC operation. This component is designed for use in electrical and industrial applications requiring holder-mounted cartridge fuses. The part maintains active product status with 813 units in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when system design requires components from alternative manufacturers while maintaining identical electrical and mechanical specifications.

Substiute Parts

KLM-1/4

Eaton - Bussmann Electrical DivisionIn Stock: 897KLM-1/4 Datasheet

Current PartRFQ

KLKD.250T

LittelfuseIn Stock: 1202KLKD.250T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KLM-1/4 are qualified based on exact equivalence across all critical electrical and mechanical parameters. The substitution criteria are:

• Current Rating: 250mA (exact match required)
• Voltage Rating: 600 VAC and 600 VDC (both required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 100kA AC and 50kA DC (exact match required)
• Physical Dimensions: 0.406" Dia x 1.500" L (exact match required)
• Mounting Configuration: Cartridge type requiring holder (exact match required)
• Regulatory Compliance: CE, CSA, UL certifications (all required)

The KLKD.250T from Littelfuse meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the KLM-1/4 and KLKD.250T are active products with full regulatory compliance across CE, CSA, and UL certifications. Selection between these components should be based on:

• Inventory availability and lead time requirements
• Packaging format preference (Bulk vs. Box)
• RoHS compliance level requirements (RoHS vs. ROHS3)
• Established supplier relationships and procurement procedures
• Application-specific environmental or operational constraints

Both components satisfy identical electrical and mechanical requirements for 250mA, 600 VAC/VDC fast-blow cartridge fuse applications.

Frequently Asked Questions (FAQ)

Q: Can KLKD.250T be used as a direct replacement for KLM-1/4?

A: Yes. The KLKD.250T meets all electrical specifications (250mA, 600 VAC/VDC, fast-blow response, 100kA/50kA breaking capacity) and physical dimensions (0.406" Dia x 1.500" L) required for direct substitution. Both components hold identical regulatory certifications (CE, CSA, UL).

Q: Are there dimensional compatibility concerns between these parts?

A: No. Both components use the standard 5AG cartridge form factor with dimensions of 0.406" Dia x 1.500" L. The 0.01mm difference in diameter (10.30mm vs. 10.31mm) is within manufacturing tolerance and does not affect holder compatibility.

Q: What is the difference in RoHS compliance between these parts?

A: The KLM-1/4 is RoHS Compliant (RoHS 2), while the KLKD.250T is ROHS3 Compliant (RoHS 3). ROHS3 represents the current regulatory standard. Both meet environmental compliance requirements; selection depends on system-level RoHS certification needs.

Q: Do these fuses require specific holder types?

A: Both the KLM-1/4 and KLKD.250T are cartridge fuses requiring a compatible 5AG holder. Verify that your existing holder is rated for 5AG cartridges before installation.

Q: Are there application differences between Eaton and Littelfuse versions?

A: The KLM-1/4 is specified for general electrical and industrial applications. The KLKD.250T is specified for solar (photovoltaic) applications. Both maintain identical electrical and mechanical parameters, making them functionally equivalent across all rated operating conditions.