Littelfuse 0312020.MXP Glass Cartridge Fuse 20A 32VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312020.MXP is a 20A 32VAC glass cartridge fuse designed for use in 3AB and 3AG fuse holders. This fast-blow fuse cartridge operates across a temperature range of -55°C to 125°C and is approved by CSA and cULus certification bodies. The part is currently active in production with 3,300 units in stock. Equivalent and substitute parts are identified when they share identical electrical ratings, mechanical dimensions, and functional characteristics, enabling direct replacement in applications where the original part number becomes unavailable or inventory constraints require alternative sourcing.

Key Parameters

Parameter	Value
Current Rating	20 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
Mounting Type	Requires Holder
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0312020.MXP is determined by strict equivalence across the following parameters: current rating (20A), voltage rating (32VAC), fuse type (cartridge glass), response time (fast blow), physical dimensions (0.250" Dia x 1.250" L), and package designation (3AB, 3AG). All identified substitute parts match these core electrical and mechanical specifications, ensuring functional interchangeability within applications designed for the original part.

The substitute parts are grouped into two categories based on manufacturer:

Littelfuse Series 312 Variants: 0312020.HXP and 0312020.VXP maintain identical specifications to the main part number, differing only in packaging or distribution channel designations.

Eaton AGC Series: AGC-20-R and BK/AGC-20-R are cross-manufacturer equivalents from Eaton's Electronics Division, sharing all critical electrical and mechanical parameters while offering alternative sourcing options.

Parameter Comparison

Parameter	0312020.MXP	0312020.HXP	0312020.VXP	AGC-20-R	BK/AGC-20-R
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division	Eaton - Electronics Division
Current Rating (Amps)	20 A	20 A	20 A	20 A	20 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
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
DC Cold Resistance	0.0035 Ohms	0.0035 Ohms	0.0035 Ohms	0.0034 Ohms	0.0034 Ohms
Approval Agency	CSA, cULus	CSA, cULus	CSA, UL	CSA, UL	CSA, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All five parts listed are active products with current manufacturing status and full regulatory compliance. The Littelfuse variants (0312020.MXP, 0312020.HXP, 0312020.VXP) carry CSA and cULus or UL certifications, while the Eaton AGC series (AGC-20-R, BK/AGC-20-R) carry CSA and UL certifications. All parts are RoHS compliant and REACH unaffected, meeting environmental regulatory requirements.

Selection between Littelfuse and Eaton variants depends on supply chain availability and existing qualification documentation within the application. The Littelfuse 0312020.MXP and its direct variants (0312020.HXP, 0312020.VXP) are recommended as primary selections when available. The Eaton AGC-20-R and BK/AGC-20-R serve as secondary alternatives when Littelfuse inventory is constrained. All parts are mechanically and electrically interchangeable within 3AB and 3AG fuse holder applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute an Eaton AGC-20-R for a Littelfuse 0312020.MXP?

A: Yes. Both parts share identical current rating (20A), voltage rating (32VAC), fuse type (cartridge glass), response time (fast blow), physical dimensions (0.250" Dia x 1.250" L), and package designation (3AB, 3AG). Both are approved by CSA and UL certification bodies and are RoHS compliant.

Q: What is the difference between 0312020.MXP, 0312020.HXP, and 0312020.VXP?

A: These are all Littelfuse Series 312 variants with identical electrical and mechanical specifications. Differences are limited to packaging designations or distribution channels. All three are functionally equivalent and interchangeable.

Q: Are the Littelfuse and Eaton fuses compatible with the same fuse holders?

A: Yes. Both manufacturers' parts conform to the 3AB and 3AG package standards with matching physical dimensions of 0.250" Dia x 1.250" L (6.35mm x 31.75mm), ensuring compatibility with standard fuse holders designed for these specifications.

Q: What certifications do these substitute parts carry?

A: The Littelfuse 0312020.MXP carries CSA and cULus certifications. The Littelfuse 0312020.HXP carries CSA and cULus certifications. The Littelfuse 0312020.VXP carries CSA and UL certifications. The Eaton AGC-20-R and BK/AGC-20-R both carry CSA and UL certifications. All parts meet applicable regulatory requirements for their respective markets.

Q: Are all these parts RoHS compliant?

A: Yes. All five parts are RoHS compliant and REACH unaffected, meeting environmental regulatory standards for electronic component manufacturing and distribution.

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