Littelfuse 0312007.H Glass Cartridge Fuse 7A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312007.H is a 7 A 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for 3AB and 3AG holder applications. This component is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing system maintenance and new design implementations. The fuse operates across a temperature range of -55°C to 125°C and is approved by CSA and UL standards.

Key Parameters

Parameter	Value
Current Rating	7 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	118
DC Cold Resistance	0.0145 Ohms

Substitute Part Grouping Explanation

Substitution of the 0312007.H is determined by strict equivalence across the following critical parameters: current rating (7 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), physical package dimensions (1/4" x 1-1/4"), and holder compatibility (3AB, 3AG). All identified substitutes maintain these core electrical and mechanical specifications.

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse): Parts 0312007.HXP, 0312007.MXP, and 0312007.VXP are manufactured by Littelfuse and share identical electrical ratings and physical dimensions with the main part. These differ primarily in product status (active vs. obsolete) and RoHS compliance level.

Cross-Manufacturer Parametric Equivalents (Eaton): Parts AGC-7-R and BK/AGC-7-R are manufactured by Eaton - Electronics Division and meet all critical electrical and mechanical parameters. These maintain the same current, voltage, package, and response characteristics while offering alternative sourcing.

Parameter Comparison

Parameter	0312007.H	0312007.HXP	0312007.MXP	0312007.VXP	AGC-7-R	BK/AGC-7-R
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division	Eaton - Electronics Division
Current Rating (Amps)	7 A	7 A	7 A	7 A	7 A	7 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V
Fuse Type	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
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"
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35 A	200 A	200 A	200 A	200 A	200 A
Melting I²t	118	118	118	118	195.02	195.02
DC Cold Resistance (Ohms)	0.0145	0.0146	0.0146	0.0146	0.012	0.012
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CSA, UL	CSA, UL

Engineering Selection Recommendations

For applications currently using the obsolete 0312007.H, direct substitution with Littelfuse active equivalents (0312007.HXP, 0312007.MXP, or 0312007.VXP) is the primary selection path. These parts maintain identical electrical specifications and physical form factors while offering improved product status and enhanced RoHS3 compliance. The Littelfuse options provide expanded regulatory approvals including CE, KC, and PSE certifications.

Cross-manufacturer substitution with Eaton AGC-7-R or BK/AGC-7-R is permissible where supply chain flexibility or cost considerations apply. Both Eaton variants maintain all critical electrical and mechanical parameters. The BK/AGC-7-R variant offers ROHS3 compliance and REACH unaffected status, providing additional regulatory alignment for new designs.

Selection between Littelfuse and Eaton options should be based on existing supply chain relationships, inventory availability, and regulatory certification requirements specific to the end application. All identified substitutes are electrically and mechanically compatible with existing 3AB and 3AG holder installations.

Frequently Asked Questions (FAQ)

Q: Can the 0312007.H be directly replaced with 0312007.HXP, 0312007.MXP, or 0312007.VXP?

A: Yes. These Littelfuse parts are direct substitutes, maintaining identical current rating (7 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (1/4" x 1-1/4"). All are compatible with 3AB and 3AG holders.

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

A: The parts 0312007.HXP, 0312007.MXP, and 0312007.VXP are electrically and mechanically identical. Differences exist only in packaging format (bulk) and inventory availability. All three are active products with ROHS3 compliance and expanded regulatory approvals.

Q: Are Eaton AGC-7-R and BK/AGC-7-R compatible with the original 0312007.H application?

A: Yes. Both Eaton parts meet all critical electrical specifications (7 A, 250 V AC, fast-blow response) and physical package requirements (1/4" x 1-1/4", 3AB/3AG compatible). They are parametric equivalents suitable for direct substitution.

Q: What is the significance of the breaking capacity difference between the main part and substitutes?

A: The 0312007.H has a breaking capacity of 35 A, while all substitute parts have 200 A breaking capacity. This indicates improved fault-handling capability in the substitute parts. Both ratings are within acceptable parameters for the specified 7 A current application.

Q: Does the melting I²t difference between Littelfuse and Eaton parts affect substitution?

A: The Littelfuse parts maintain the original melting I²t value of 118, while Eaton parts have 195.02. Both values are provided specifications for their respective products. Selection should be based on application-specific thermal requirements and existing system validation.

Q: Are all substitute parts RoHS compliant?

A: The original 0312007.H is RoHS non-compliant. All identified substitutes are RoHS compliant (either RoHS or ROHS3 level), making them suitable for applications with RoHS compliance requirements.

Q: What regulatory approvals should I verify for my specific application?

A: The original part carries CSA and UL approvals. Littelfuse substitutes add CE, KC, and PSE certifications. Eaton parts maintain CSA and UL approvals. Verify that the selected substitute meets all regulatory requirements for your end-use application and geographic market.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message