Littelfuse 0312035.H Glass Cartridge Fuse 35A 32VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312035.H is a 35 A, 32 V AC/DC glass cartridge fuse in the 312 series, designed for 3AB and 3AG holder applications with dimensions of 0.250" diameter by 1.250" length. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued circuit protection functionality.

Key Parameters

Parameter	Value
Current Rating	35 A
Voltage Rating (AC)	32 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.0013 Ohms
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution of the 0312035.H is determined by strict equivalence across the following parameters: current rating (35 A), voltage rating (32 V AC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (0.250" x 1.250"). All substitute parts listed maintain these specifications, ensuring mechanical and electrical compatibility within 3AB and 3AG holder assemblies.

The substitute parts are grouped into two categories:

Manufacturer-Recommended Substitute: 0312035.HXP (Littelfuse Inc.) — Active product status with current availability.

Parametric Equivalents: 0312035.MXP and 0312035.VXP (Littelfuse Inc.), and AGC-35-R (Eaton - Electronics Division) — All active products meeting identical electrical and mechanical parameters.

Parameter Comparison

Parameter	0312035.H	0312035.HXP	0312035.MXP	0312035.VXP	AGC-35-R
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division
Current Rating (Amps)	35 A	35 A	35 A	35 A	35 A
Voltage Rating - AC	32 V	32 V	32 V	32 V	32 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	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"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.0013 Ohms	0.0013 Ohms	0.0013 Ohms	0.0013 Ohms	0.0021 Ohms
Product Status	Obsolete	Active	Active	Active	Active
Breaking Capacity @ Rated Voltage	Not Specified	300A	300A	300A	1kA
Melting I²t	Not Specified	7531	7531	7531	7350
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

All substitute parts maintain electrical and mechanical compatibility with the 0312035.H across current rating, voltage rating, fuse type, response time, and physical dimensions. Selection among active alternatives should prioritize product availability and compliance requirements.

The Littelfuse 0312035.HXP is the manufacturer-recommended substitute, offering active product status and ROHS3 compliance. The Littelfuse 0312035.MXP and 0312035.VXP provide equivalent parametric specifications with higher inventory availability and identical compliance status.

The Eaton AGC-35-R offers parametric equivalence with higher breaking capacity (1kA versus 300A) and CSA/UL approval agency certifications. The DC cold resistance of 0.0021 Ohms differs from the Littelfuse alternatives at 0.0013 Ohms; this variance remains within acceptable tolerance for fast-blow cartridge fuse applications at the specified current and voltage ratings.

Frequently Asked Questions (FAQ)

Q: Can the 0312035.H be directly replaced with any of the listed substitutes?

A: Yes. All substitute parts maintain identical current rating (35 A), voltage rating (32 V AC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (0.250" x 1.250"). Direct mechanical and electrical compatibility is confirmed for 3AB and 3AG holder applications.

Q: What is the difference between the Littelfuse and Eaton substitutes?

A: The Littelfuse alternatives (0312035.HXP, 0312035.MXP, 0312035.VXP) share identical DC cold resistance (0.0013 Ohms) and melting I²t (7531) with breaking capacity of 300A. The Eaton AGC-35-R provides higher breaking capacity (1kA) with slightly elevated DC cold resistance (0.0021 Ohms) and includes CSA/UL certifications.

Q: Are there compliance differences between substitutes?

A: The Littelfuse substitutes are ROHS3 compliant. The Eaton AGC-35-R is RoHS compliant with CSA and UL approval agency certifications. The original 0312035.H is RoHS non-compliant and obsolete.

Q: Does DC cold resistance variation affect fuse performance?

A: DC cold resistance is specified for all parts. The Eaton AGC-35-R at 0.0021 Ohms differs from Littelfuse alternatives at 0.0013 Ohms. Both values are within acceptable parameters for fast-blow cartridge fuse operation at 35 A and 32 V AC.

Q: Which substitute offers the best availability?

A: The Littelfuse 0312035.MXP shows the highest inventory level at 2033 pieces. The 0312035.VXP provides 708 pieces, and the 0312035.HXP (manufacturer-recommended) provides 857 pieces. The Eaton AGC-35-R offers 967 pieces.

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