0RLS025.T Equivalent & Substitute Parts

Part Overview

The 0RLS025.T is a 25A 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 in electrical and industrial applications. The cartridge fuse requires a dedicated holder for installation and is designed for AC electrical circuits operating at 600VAC with a 10kA breaking capacity at rated voltage.

Substiute Parts

0RLS025.T

Littelfuse Inc.In Stock: 9360RLS025.T Datasheet

Current PartRFQ

KLSR025.T

LittelfuseIn Stock: 728KLSR025.T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0RLS025.T is determined by the following critical parameters that must remain constant or be compatible:

• Current Rating: 25A (exact match required)
• Voltage Rating - AC: 600VAC (minimum requirement)
• Fuse Type: Cartridge (physical and functional form factor)
• Size / Dimension: 0.811" Dia x 5.000" L (mechanical compatibility with existing holders)
• Response Time: Fast Blow (circuit protection characteristic)
• Mounting Type: Requires Holder (installation method compatibility)

The KLSR025.T from Littelfuse's POWR-GARD® KLSR series meets all substitution criteria. While it operates in a different fuse class (RK1 versus H) and provides enhanced breaking capacity specifications, it maintains identical current rating, AC voltage rating, physical dimensions, and cartridge form factor. The KLSR025.T also provides DC voltage capability (250VDC), which represents an additional operational parameter not present in the original part.

Parameter Comparison

Engineering Selection Recommendations

The KLSR025.T is the direct substitute for the obsolete 0RLS025.T. Selection is based on the following engineering factors:

• Product Status: The 0RLS025.T is obsolete, while the KLSR025.T is active and currently manufactured, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: The KLSR025.T achieves ROHS3 compliance, whereas the 0RLS025.T is RoHS non-compliant. Both parts maintain identical certification from CE, CSA, and UL approval agencies.
• Electrical Compatibility: Both parts are rated for 600VAC at 25A with fast-blow response characteristics. The KLSR025.T provides additional DC voltage capability (250VDC) without affecting AC circuit operation.
• Physical Compatibility: Identical cartridge dimensions (0.811" Dia x 5.000" L) ensure direct mechanical fit in existing fuse holders.
• Enhanced Performance: The KLSR025.T offers significantly higher breaking capacity (200kA AC versus 10kA), providing superior fault protection in modern electrical systems.

Frequently Asked Questions (FAQ)

Q: Can the KLSR025.T be used as a direct replacement for the 0RLS025.T in existing installations?

A: Yes. Both parts share identical current rating (25A), AC voltage rating (600VAC), physical dimensions (0.811" Dia x 5.000" L), and cartridge form factor. The KLSR025.T will function identically in any circuit designed for the 0RLS025.T.

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

A: Fuse class designates the breaking capacity and application characteristics. Class H fuses have a 10kA breaking capacity, while class RK1 fuses have a 200kA breaking capacity. The RK1 classification provides enhanced protection in circuits with higher available fault currents.

Q: Does the KLSR025.T's DC voltage rating (250VDC) affect its use in AC-only circuits?

A: No. The DC voltage rating is an additional capability that does not impact AC circuit operation. The part maintains full compatibility with 600VAC AC circuits.

Q: Why is the 0RLS025.T obsolete?

A: Product obsolescence is determined by the manufacturer based on market demand, production efficiency, and product line consolidation. The KLSR025.T represents the current-generation equivalent from Littelfuse's POWR-GARD® product family.

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

A: Yes. Both the 0RLS025.T and KLSR025.T hold identical certifications from CE, CSA, and UL, ensuring compliance with applicable electrical safety standards.

Q: What is the inventory status of these parts?

A: The 0RLS025.T has 845 pieces in stock as new original inventory. The KLSR025.T has 716 pieces in stock as new original inventory. Availability may vary by distributor and region.