Littelfuse 0RLS175.X Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0RLS175.X is a 175A, 600 VAC cylindrical fuse cartridge from the POWR-GARD® RLS series, designed for electrical and industrial applications requiring fast-blow protection. This part is classified as obsolete, making identification of suitable substitute components essential for system maintenance and replacement scenarios. The 0RLS175.X requires a compatible fuse holder for installation and operates within Class H specifications with a 10kA breaking capacity at rated voltage.

Substiute Parts

0RLS175.X

Littelfuse Inc.In Stock: 7150RLS175.X Datasheet

Current PartRFQ

KLSR175.X

Littelfuse Inc.In Stock: 966KLSR175.X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0RLS175.X is determined by the following critical parameters:

• Current Rating: 175A (must match exactly)
• Voltage Rating - AC: 600 VAC (must match or exceed)
• Fuse Type: Cartridge with blade terminals (must match)
• Physical Dimensions: Cylindrical form factor (must be compatible with existing holders)
• Mounting Configuration: Requires holder installation (must match)
• Response Time: Fast Blow characteristic (must match)

The Littelfuse KLSR175.X meets all substitution criteria. While it operates in Class RK1 rather than Class H, it maintains identical current and AC voltage ratings, identical physical dimensions, and identical blade terminal configuration. The KLSR175.X is an active product with enhanced breaking capacity specifications and expanded voltage capability (300 VDC addition), making it a direct functional replacement for the obsolete 0RLS175.X in 600 VAC applications.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse KLSR175.X is the manufacturer-recommended substitute for the obsolete 0RLS175.X. Both components maintain identical current and AC voltage ratings, identical physical diameter, and identical blade terminal configuration, ensuring mechanical and electrical compatibility within existing fuse holder installations.

The KLSR175.X provides enhanced performance characteristics including significantly higher breaking capacity (200kA AC versus 10kA) and ROHS3 compliance, addressing modern regulatory requirements. The KLSR175.X operates in Class RK1 rather than Class H; however, both classes are approved for 600 VAC applications and maintain fast-blow response characteristics suitable for the same electrical protection requirements.

The dimensional difference in length (9.626" versus 6.878") must be verified against the specific fuse holder design to ensure physical accommodation. Littelfuse Inc. has designated the KLSR175.X as the direct replacement, indicating compatibility with standard holder configurations for this current and voltage rating.

Frequently Asked Questions (FAQ)

Q: Can the KLSR175.X be used as a direct replacement for the 0RLS175.X?

A: Yes. Both components share identical current rating (175A), AC voltage rating (600 VAC), fuse type (cartridge), response time (fast blow), and blade terminal configuration. Littelfuse Inc. designates the KLSR175.X as the manufacturer-recommended substitute. Verify that the fuse holder accommodates the KLSR175.X length specification (9.626" L).

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

A: Both Class H and Class RK1 are fuse classifications approved for 600 VAC applications. The KLSR175.X (Class RK1) provides higher breaking capacity (200kA AC) compared to the 0RLS175.X (Class H, 10kA), offering enhanced protection in high-fault-current environments.

Q: Does the KLSR175.X fit in holders designed for the 0RLS175.X?

A: The KLSR175.X has identical diameter (1.843") and blade terminal configuration as the 0RLS175.X. However, the KLSR175.X is longer (9.626" L versus 6.878" L). Verify that the specific fuse holder design accommodates this length difference before installation.

Q: Is the KLSR175.X RoHS compliant?

A: Yes. The KLSR175.X is ROHS3 compliant, whereas the 0RLS175.X is RoHS non-compliant. This makes the KLSR175.X suitable for applications requiring modern regulatory compliance.

Q: Can the KLSR175.X be used in DC applications?

A: The KLSR175.X is rated for 300 VDC operation in addition to 600 VAC. The 0RLS175.X does not specify DC capability. If DC operation is required, the KLSR175.X provides this expanded functionality.

Q: Are both parts approved by the same certification agencies?

A: Yes. Both the 0RLS175.X and KLSR175.X carry CE, CSA, and UL approvals, ensuring compliance with international electrical safety standards.