Littelfuse 0312005.H Glass Cartridge Fuse 5A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312005.H is a 5A 250VAC glass cartridge fuse in the 312 series, designed for 3AB and 3AG holder applications with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse provides fast-blow response characteristics suitable for general circuit protection applications requiring 5A current limiting at 250V AC/DC.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35A
Melting I²t	50

Substitute Part Grouping Explanation

Substitution for the 0312005.H is determined by strict equivalence across the following critical parameters:

Current Rating: 5 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)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these electrical and mechanical parameters. Littelfuse 0312005.HXP, 0312005.MXP, and 0312005.VXP are direct manufacturer equivalents with active product status. Eaton AGC series parts (AGC-5-R, BK-AGC-B-5-R, BK/AGC-5-R, BK/AGC-5BX, BK/AGC-5PP-R) are parametric equivalents from an alternative manufacturer meeting identical functional specifications.

Parameter Comparison

Parameter	0312005.H	0312005.HXP	0312005.MXP	0312005.VXP	AGC-5-R	BK-AGC-B-5-R	BK/AGC-5-R	BK/AGC-5BX	BK/AGC-5PP-R
Manufacturer	Littelfuse	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton	Eaton	Eaton	Eaton	Eaton
Current Rating (A)	5	5	5	5	5	5	5	5	5
Voltage Rating (V AC)	250	250	250	250	250	250	250	250	250
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Operating Temperature (°C)	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125
Breaking Capacity @ Rated Voltage (A)	35	200	200	200	200	200	200	200	200
Melting I²t	50	50	50	50	131.5	131.5	131.5	131.5	131.5
DC Cold Resistance (Ohms)	0.0223	0.0224	0.0224	0.0224	0.019	0.019	0.019	0.019	0.019
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified	Not specified
Approval Agency	CSA, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CSA, UL	CSA, UL	CSA, UL	CSA, UL	CSA, UL

Engineering Selection Recommendations

For applications currently using the obsolete 0312005.H, the Littelfuse 0312005.HXP, 0312005.MXP, and 0312005.VXP are the primary substitutes. These parts maintain identical electrical and mechanical specifications while offering active product status and enhanced regulatory compliance (ROHS3 compliant with expanded approval certifications including CE, KC, and PSE). All three Littelfuse alternatives are manufactured by the original equipment supplier.

The Eaton AGC series (AGC-5-R, BK-AGC-B-5-R, BK/AGC-5-R, BK/AGC-5BX, BK/AGC-5PP-R) provides parametric equivalence from an alternative manufacturer. These parts meet all critical electrical and mechanical requirements and carry CSA and UL approvals. The Eaton parts feature higher breaking capacity (200A versus 35A on the original) and higher melting I²t values (131.5 versus 50), representing enhanced performance characteristics within the same functional envelope.

Selection between Littelfuse and Eaton alternatives depends on supply chain requirements, existing inventory management practices, and regulatory compliance documentation needs. All listed substitutes are electrically and mechanically interchangeable for 5A 250VAC fast-blow cartridge fuse applications in 3AB/3AG holders.

Frequently Asked Questions (FAQ)

Q: Can I use 0312005.HXP, 0312005.MXP, or 0312005.VXP interchangeably with 0312005.H?

A: Yes. These Littelfuse parts are direct manufacturer equivalents meeting identical current rating (5A), voltage rating (250V AC), fuse type (cartridge glass), response time (fast blow), package dimensions (1/4" x 1-1/4"), and operating temperature range (-55°C to 125°C). The primary difference is product status (active versus obsolete) and enhanced regulatory compliance on the newer variants.

Q: Are Eaton AGC series fuses compatible with 0312005.H applications?

A: Yes. The Eaton AGC-5-R, BK-AGC-B-5-R, BK/AGC-5-R, BK/AGC-5BX, and BK/AGC-5PP-R are parametric equivalents meeting all critical electrical and mechanical specifications. They fit the same 3AB/3AG holders and provide identical 5A 250VAC fast-blow protection. Both manufacturers' parts carry CSA and UL approvals.

Q: What is the difference between Littelfuse and Eaton substitute options?

A: Littelfuse 0312005.HXP, 0312005.MXP, and 0312005.VXP are direct manufacturer equivalents from the original supplier with expanded international certifications (CE, KC, PSE). Eaton AGC series parts are alternative manufacturer equivalents with equivalent performance. Eaton parts feature higher breaking capacity (200A) and higher melting I²t (131.5), representing enhanced fault current handling within the same 5A rated envelope.

Q: Do all substitute parts have the same physical dimensions?

A: Yes. All substitute parts maintain the 0.250" diameter x 1.250" length (6.35mm x 31.75mm) specification and are compatible with 3AB and 3AG fuse holders.

Q: Which substitute should I select for new designs?

A: For new designs, select from the active product status alternatives: Littelfuse 0312005.HXP, 0312005.MXP, 0312005.VXP, or Eaton AGC series parts. All meet current electrical and mechanical requirements. Littelfuse options provide continuity with the original manufacturer; Eaton options provide alternative sourcing. Verify regulatory compliance documentation requirements for your specific application and region.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. The original 0312005.H is RoHS non-compliant. Littelfuse 0312005.HXP, 0312005.MXP, 0312005.VXP, and most Eaton AGC variants are ROHS3 compliant. For applications requiring RoHS compliance, select from the ROHS3 compliant alternatives.

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