Equivalent & Substitute Parts for 0RLS004.T

Part Overview

The 0RLS004.T is a 4A 600VAC fast-blow cartridge fuse from Littelfuse Inc.'s POWR-GARD® RLS series. This component is classified as obsolete, making identification of compatible substitute parts essential for system maintenance and component replacement. The cartridge fuse requires a dedicated holder for installation and is designed for electrical and industrial applications where fast-response overcurrent protection is required.

Substiute Parts

0RLS004.T

Littelfuse Inc.In Stock: 9100RLS004.T Datasheet

Current PartRFQ

KLSR004.T

Littelfuse Inc.In Stock: 800KLSR004.T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0RLS004.T is determined by the following critical parameters:

• Current Rating: Must be 4A to match the protected circuit design
• Voltage Rating - AC: Must be rated for 600 VAC minimum
• Physical Dimensions: Must be 0.811" Dia x 5.000" L to fit existing holder assemblies
• Fuse Type: Must be cartridge format requiring holder mounting
• Response Time: Fast-blow characteristic for equivalent protection response
• Approval Certifications: Must maintain CE, CSA, and UL compliance for regulatory continuity

The KLSR004.T meets all substitution criteria while offering enhanced specifications including DC voltage capability and improved breaking capacity.

Parameter Comparison

Engineering Selection Recommendations

The KLSR004.T is the manufacturer-recommended substitute for the obsolete 0RLS004.T. Both components share identical current ratings, AC voltage ratings, physical dimensions, and holder mounting requirements, ensuring direct mechanical and electrical compatibility within existing assemblies.

The KLSR004.T maintains all required regulatory certifications (CE, CSA, UL) and provides superior performance characteristics including enhanced breaking capacity (200kA AC versus 10kA) and DC voltage capability (250 VDC). The KLSR004.T is classified as active product status, ensuring continued availability and supply chain reliability.

For applications requiring RoHS compliance, the KLSR004.T meets ROHS3 standards, whereas the 0RLS004.T does not. The class change from H to RK1 reflects improved protective characteristics in the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the KLSR004.T be used as a direct replacement for the 0RLS004.T?

A: Yes. Both components have identical current ratings (4A), AC voltage ratings (600 VAC), physical dimensions (0.811" Dia x 5.000" L), and mounting requirements (cartridge format requiring holder). They are mechanically and electrically interchangeable in existing assemblies.

Q: What is the difference between Class H and Class RK1?

A: Class H and Class RK1 are fuse classifications that define response characteristics and breaking capacity. The KLSR004.T (RK1) provides higher breaking capacity (200kA AC) compared to the 0RLS004.T (Class H, 10kA), offering enhanced protection in high-fault-current environments.

Q: Does the KLSR004.T add DC voltage capability?

A: Yes. The KLSR004.T is rated for 250 VDC in addition to 600 VAC, whereas the 0RLS004.T is specified only for AC voltage. This expanded rating does not affect AC-only applications but provides flexibility for mixed-voltage systems.

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

A: Yes. Both the 0RLS004.T and KLSR004.T carry CE, CSA, and UL certifications, maintaining regulatory compliance across jurisdictions.

Q: What is the inventory status of these parts?

A: The 0RLS004.T (obsolete) has 810 units in stock. The KLSR004.T (active) has 773 units in stock and represents the current production alternative.