KLM-4 Equivalent & Substitute Parts

Part Overview

The KLM-4 is a 4A cartridge fuse rated for 600 VAC/VDC operation, manufactured by Eaton - Bussmann Electrical Division. This fast-blow fuse cartridge requires a compatible holder for installation and is designed for electrical and industrial applications. The part maintains active product status with 1180 units in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary KLM-4 becomes unavailable or when procurement requirements necessitate equivalent components meeting identical electrical and mechanical specifications.

Substiute Parts

KLM-4

Eaton - Bussmann Electrical DivisionIn Stock: 1204KLM-4 Datasheet

Current PartRFQ

KLKD004.HXR

Littelfuse Inc.In Stock: 978KLKD004.HXR Datasheet

SimilarRFQ

KLKD004.T

Littelfuse Inc.In Stock: 873KLKD004.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KLM-4 are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

• Current Rating: 4A (exact match required)
• Voltage Rating: 600 VAC and 600 VDC (both required)
• Fuse Type: Cartridge configuration
• Response Time: Fast Blow characteristic
• Breaking Capacity: 100kA AC and 50kA DC minimum
• Physical Dimensions: 0.406" Dia x 1.500" L (10.30mm x 38.10mm)
• Mounting: Requires compatible holder
• Regulatory Compliance: CE, CSA, UL certifications

The identified substitutes (KLKD004.HXR and KLKD004.T) meet all mandatory electrical parameters and dimensional specifications. Both are manufactured by Littelfuse Inc. under the POWR-GARD® KLKD series and maintain equivalent performance characteristics for direct replacement applications.

Parameter Comparison

Engineering Selection Recommendations

Both KLKD004.HXR and KLKD004.T qualify as direct electrical and mechanical equivalents to the KLM-4. Selection between these options is determined by packaging requirements:

KLKD004.HXR is supplied in Bulk packaging and maintains 898 units in inventory. KLKD004.T is supplied in Box packaging with 780 units available. Both parts carry active product status and meet or exceed the regulatory certifications of the original KLM-4, including CE, CSA, and UL approvals with additional VDE certification. The ROHS3 compliance status of both substitutes exceeds the RoHS Compliant designation of the KLM-4, ensuring enhanced environmental and material standards.

Frequently Asked Questions (FAQ)

Q: Can KLKD004.HXR and KLKD004.T be used interchangeably with KLM-4?

A: Yes. Both Littelfuse parts meet identical electrical specifications (4A, 600 VAC/VDC, fast-blow response, 100kA AC / 50kA DC breaking capacity) and physical dimensions (0.406" Dia x 1.500" L). The difference between them is packaging format: KLKD004.HXR is supplied in Bulk; KLKD004.T is supplied in Box.

Q: What is the difference between KLKD004.HXR and KLKD004.T?

A: The electrical and mechanical specifications are identical. The only distinction is packaging: KLKD004.HXR uses Bulk packaging, while KLKD004.T uses Box packaging. Selection depends on procurement and inventory management requirements.

Q: Are the substitute parts compatible with existing KLM-4 holders?

A: Yes. Both KLKD004.HXR and KLKD004.T maintain the same cartridge dimensions (0.406" Dia x 1.500" L) and require compatible holders identical to those used with the KLM-4.

Q: Do the substitute parts meet the same regulatory certifications?

A: The substitute parts meet or exceed the certifications of the KLM-4. Both KLKD004.HXR and KLKD004.T carry CE, CSA, and UL approvals (matching the KLM-4) plus additional VDE certification. Both also meet ROHS3 compliance, which exceeds the RoHS Compliant status of the original part.

Q: What is the melting I²t value for the substitute parts?

A: Both KLKD004.HXR and KLKD004.T have a melting I²t of 18.945, with a DC cold resistance of 0.0511 Ohms.