Littelfuse 0312008.H Glass Cartridge Fuse 8A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312008.H is an 8 A, 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for 3AB and 3AG holder compatibility. This fuse operates across a temperature range of -55°C to 125°C and features a 1/4" x 1-1/4" form factor. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs requiring this electrical specification.

Substiute Parts

0312008.H

Littelfuse Inc.In Stock: 7220312008.H Datasheet

Current PartRFQ

0312008.HXP

Littelfuse Inc.In Stock: 11330312008.HXP Datasheet

DirectRFQ

0312008.MXP

Littelfuse Inc.In Stock: 63130312008.MXP Datasheet

Parametric EquivalentRFQ

0312008.TXP

Littelfuse Inc.In Stock: 8250312008.TXP Datasheet

Parametric EquivalentRFQ

0312008.VXP

Littelfuse Inc.In Stock: 11900312008.VXP Datasheet

Parametric EquivalentRFQ

AGC-8-R

Eaton - Electronics DivisionIn Stock: 883AGC-8-R Datasheet

Parametric EquivalentRFQ

BK/AGC-8-R

Eaton - Electronics DivisionIn Stock: 1947BK/AGC-8-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0312008.H is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 8 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Operating Temperature Range: -55°C to 125°C (minimum requirement)

All substitute parts listed below meet these core electrical and mechanical specifications. Differences in breaking capacity, DC cold resistance, and approval agencies are noted but do not preclude substitution when the above parameters are satisfied.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts satisfy the core electrical and mechanical requirements for direct replacement of the 0312008.H. Selection among available substitutes should be based on the following factors:

Product Status: The 0312008.H is obsolete. All substitute parts listed are in active production status, ensuring long-term availability and supply chain continuity.

Compliance and Certifications: The original 0312008.H carries CSA and UL approvals. Littelfuse substitute parts (0312008.HXP, 0312008.MXP, 0312008.TXP, 0312008.VXP) provide expanded certification coverage including CE, KC, and PSE in addition to CSA and UL. Eaton parts (AGC-8-R, BK/AGC-8-R) carry CSA and UL certifications.

RoHS Compliance: The original part is RoHS non-compliant. All active substitute parts are ROHS3 compliant, meeting current environmental and regulatory standards.

Inventory Availability: Littelfuse 0312008.MXP offers the highest inventory level (6,247 units), followed by Eaton BK/AGC-8-R (1,849 units), providing supply security for high-volume applications.

Breaking Capacity: The original part specifies 35 A breaking capacity. All active substitutes provide 200 A breaking capacity, representing an improvement in fault protection capability.

Frequently Asked Questions (FAQ)

Q: Can I use 0312008.HXP, 0312008.MXP, 0312008.TXP, or 0312008.VXP interchangeably with the original 0312008.H?

A: Yes. All Littelfuse variants meet identical electrical specifications (8 A, 250 V AC, fast-blow response) and mechanical requirements (3AB/3AG holder compatibility, 1/4" x 1-1/4" form factor). The suffix designations indicate packaging or internal manufacturing variations that do not affect electrical performance or holder compatibility.

Q: What is the difference between Littelfuse and Eaton fuses in this comparison?

A: Both manufacturers provide 8 A, 250 V AC glass cartridge fuses with identical electrical ratings and mechanical form factors. Littelfuse parts maintain the original series designation (312 series), while Eaton parts use the AGC series designation. Both are approved by CSA and UL. Eaton parts feature a lower DC cold resistance (0.009 Ohms vs. 0.0122 Ohms) and higher melting I²t (256 vs. 166).

Q: Are the Eaton AGC-8-R and BK/AGC-8-R parts functionally identical?

A: Yes. Both Eaton parts share identical electrical specifications, mechanical dimensions, and performance characteristics. The BK prefix indicates a specific packaging or distribution variant. Both are suitable for direct replacement.

Q: Will a substitute part work in my existing 3AB or 3AG holder?

A: Yes. All substitute parts are specified for 3AB and 3AG holder compatibility with identical 1/4" x 1-1/4" dimensions. No holder modification or replacement is required.

Q: What does "fast-blow" response mean?

A: Fast-blow fuses are designed to open quickly under overcurrent conditions, typically within milliseconds. All parts in this comparison share this response characteristic, ensuring consistent circuit protection behavior.

Q: Why does the original 0312008.H have a lower breaking capacity (35 A) than the substitutes (200 A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The higher breaking capacity of substitute parts represents an improvement in fault protection capability while maintaining identical normal-operation electrical ratings.