Littelfuse 0274.600H Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0274.600H is a 500 mA, 125 V AC/DC board mount fuse designed for through-hole radial mounting in the MICRO™ 273 series. This fast-blow fuse is actively manufactured and widely used in circuit protection applications requiring reliable overcurrent protection at low voltage levels. Substitute parts may be required due to inventory constraints, design revisions, or supply chain considerations while maintaining identical electrical and mechanical performance.

Substiute Parts

0273.500H

Littelfuse Inc.In Stock: 15700273.500H Datasheet

Current PartRFQ

0279.500V

Littelfuse Inc.In Stock: 9030279.500V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0274.600H is permissible with the Littelfuse 0279.500V based on strict parametric equivalence. Both parts share identical electrical characteristics and mechanical specifications that define functional interchangeability:

Critical Substitution Parameters:

• Current Rating: 500 mA (identical)
• Voltage Rating: 125 V AC / 125 V DC (identical)
• Response Time: Fast Blow (identical)
• Breaking Capacity: 10 kA (identical)
• Melting I²t: 0.0716 (identical)
• Physical Dimensions: 0.250" Dia x 0.350" H (identical)
• DC Cold Resistance: 0.167 Ohms (identical)
• Mounting Configuration: Through Hole, Radial, Can, Vertical (identical)
• Approval Certifications: CSA, QPL, UL (identical)
• Operating Temperature: -55°C ~ 85°C (identical)
• Compliance: ROHS3 Compliant, REACH Unaffected (identical)

The substitution is based exclusively on parametric matching across all electrical, mechanical, and regulatory specifications. No deviations exist between the main part and substitute part in any critical parameter.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0274.600H and 0279.500V are active products manufactured by Littelfuse Inc. and carry identical regulatory approvals (CSA, QPL, UL). Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with current environmental and regulatory requirements.

Selection between these parts should be based on availability and supply chain considerations. The 0274.600H (MICRO™ 273 series) and 0279.500V (MICRO™ 279 series) are functionally equivalent for all circuit protection applications requiring 500 mA fast-blow protection at 125 V AC/DC with 10 kA breaking capacity. No performance or reliability differences exist between the two parts based on provided specifications.

Frequently Asked Questions (FAQ)

Q: Can the 0279.500V directly replace the 0274.600H in existing designs?

A: Yes. Both parts are parametrically identical across all electrical, mechanical, and thermal specifications. Direct substitution is permissible without circuit redesign or board layout modification.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts share identical dimensions of 0.250" diameter by 0.350" height (6.35 mm x 8.89 mm) and use identical through-hole radial mounting configuration.

Q: Do both parts carry the same regulatory certifications?

A: Yes. Both the 0274.600H and 0279.500V carry CSA, QPL, and UL approvals. Both are ROHS3 compliant and REACH unaffected.

Q: What is the difference between the MICRO™ 273 and MICRO™ 279 series?

A: Based on provided specifications, no functional differences exist between these series for the 500 mA, 125 V rating. Both series use identical electrical characteristics and mechanical packaging.

Q: Are there any temperature or environmental performance differences?

A: No. Both parts operate across the identical temperature range of -55°C to 85°C and maintain identical moisture sensitivity level (MSL 1 - Unlimited).

Q: Can these parts be used interchangeably in high-reliability applications?

A: Yes. Both parts carry identical approval certifications (CSA, QPL, UL) and maintain active product status, making them suitable for equivalent reliability requirements.