Littelfuse 031201.5H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 031201.5H is a 1.5 A, 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for 3AB and 3AG holder mounting. This part is classified as obsolete, though 976 pieces remain in stock. Due to its obsolete status, equivalent substitute parts from active product lines are necessary for ongoing system support and new designs. Substitute parts maintain identical electrical and mechanical specifications while offering improved availability and compliance certifications.

Key Parameters

Parameter	Value
Current Rating	1.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 1.5 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 to 125°C (exact match required)

All substitute parts listed below meet these criteria. Substitutes are grouped into two categories: direct Littelfuse manufacturer equivalents (031201.5HXP, 031201.5MXP, 031201.5VXP) and parametric equivalents from Eaton Electronics Division (AGC series variants).

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	DC Cold Resistance (Ohms)	Product Status	RoHS Status
031201.5H	Littelfuse Inc.	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	35 A	0.103	Obsolete	RoHS non-compliant
031201.5HXP	Littelfuse Inc.	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.1036	Active	ROHS3 Compliant
031201.5MXP	Littelfuse Inc.	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.1036	Active	ROHS3 Compliant
031201.5VXP	Littelfuse Inc.	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.1036	Active	ROHS3 Compliant
AGC-1-1/2-R	Eaton - Electronics Division	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.077	Active	RoHS Compliant
BK/AGC-1-1/2-R	Eaton - Electronics Division	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.077	Active	ROHS3 Compliant
BK/AGC-1-1/2AA-R	Eaton - Electronics Division	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.077	Active	Not specified
BK/AGC-1-1/2LX	Eaton - Electronics Division	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.077	Active	RoHS non-compliant
BK/AGC-1-1/2RX	Eaton - Electronics Division	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.077	Active	Not specified
BP-AGC-1-1-2-RP	Eaton - Bussmann Electrical Division	1.5 A	250 V	Fast Blow	3AB, 3AG, 1/4" x 1-1/4"	100 A	0.077	Active	Not specified

Engineering Selection Recommendations

Littelfuse Active Equivalents (031201.5HXP, 031201.5MXP, 031201.5VXP): These parts are direct manufacturer equivalents with active product status. All three carry ROHS3 compliance and improved breaking capacity (100 A versus 35 A on the obsolete 031201.5H). Selection among these three should be based on packaging availability and inventory requirements. All three are certified by CE, CSA, PSE, and UL.

Eaton AGC Series Equivalents: The AGC series variants (AGC-1-1/2-R, BK/AGC-1-1/2-R, BK/AGC-1-1/2AA-R, BK/AGC-1-1/2LX, BK/AGC-1-1/2RX, BP-AGC-1-1-2-RP) are parametric equivalents with active product status. These parts feature lower DC cold resistance (0.077 Ohms versus 0.1036 Ohms on Littelfuse equivalents) and higher breaking capacity (100 A). AGC series parts are certified by CSA and UL. BK/AGC-1-1/2-R carries ROHS3 compliance; BK/AGC-1-1/2LX is RoHS non-compliant.

For new designs requiring RoHS3 compliance, select from: 031201.5HXP, 031201.5MXP, 031201.5VXP, or BK/AGC-1-1/2-R.

Frequently Asked Questions (FAQ)

Q: Can the 031201.5H be directly replaced with any of these substitute parts?

A: Yes. All listed substitute parts maintain identical current rating (1.5 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (fast blow), and package dimensions (3AB, 3AG, 1/4" x 1-1/4"). Physical and electrical compatibility is assured.

Q: What is the difference between Littelfuse and Eaton AGC equivalents?

A: Both meet all electrical and mechanical substitution criteria. Littelfuse equivalents (031201.5HXP, 031201.5MXP, 031201.5VXP) are direct manufacturer replacements with slightly higher DC cold resistance (0.1036 Ohms). Eaton AGC series parts have lower DC cold resistance (0.077 Ohms) and are available from a different manufacturer. All carry equivalent certifications and breaking capacity ratings.

Q: Are there differences among the three Littelfuse active equivalents (031201.5HXP, 031201.5MXP, 031201.5VXP)?

A: All three parts are electrically and mechanically identical. Differences exist only in packaging format and inventory availability. 031201.5MXP has the highest inventory (30,900 pieces). Selection should be based on packaging requirements and supply chain availability.

Q: Which substitute part should I select for RoHS3 compliance?

A: For RoHS3 compliance, select from: 031201.5HXP, 031201.5MXP, 031201.5VXP (Littelfuse), or BK/AGC-1-1/2-R (Eaton). The original 031201.5H is RoHS non-compliant.

Q: Do all substitute parts fit the same 3AB and 3AG holders?

A: Yes. All substitute parts are specified for 3AB and 3AG holder mounting with identical dimensions (1/4" diameter x 1-1/4" length). Physical installation compatibility is guaranteed.

Q: What is the breaking capacity difference between the original part and substitutes?

A: The original 031201.5H has a breaking capacity of 35 A at rated voltage. All substitute parts have a breaking capacity of 100 A at rated voltage, providing improved performance margin.

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