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

Part Overview

The Littelfuse 0312020.HXP is a 20 A, 32 V AC/DC glass cartridge fuse with fast-blow response characteristics. This component is classified as Active product status and is designed for applications requiring reliable overcurrent protection in 3AB and 3AG holder configurations. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and approval certifications to ensure direct interchangeability in circuit protection applications.

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)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
Approval Agency	CSA, cULus
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0312020.HXP are grouped into two categories based on parametric equivalence:

Category 1: Littelfuse Series 312 Variants Parts 0312020.MXP and 0312020.VXP are direct parametric equivalents manufactured by Littelfuse Inc. within the same 312 series. These parts share identical electrical ratings (20 A, 32 V AC), fuse type (cartridge glass), response time (fast blow), physical dimensions (0.250" Dia x 1.250" L), and holder compatibility (3AB, 3AG). All three Littelfuse variants maintain the same melting I²t value of 1029 and DC cold resistance of 0.0035 Ohms. Approval certifications include CSA and UL variants (cULus for 0312020.HXP, UL for 0312020.VXP, and CSA/cULus for 0312020.MXP).

Category 2: Eaton AGC Series Parts AGC-20-R and BK/AGC-20-R are manufactured by Eaton - Electronics Division and represent cross-manufacturer equivalents. These parts match all critical electrical parameters: 20 A current rating, 32 V AC voltage rating, fast-blow response, and identical physical dimensions (0.250" Dia x 1.250" L). Both Eaton variants are compatible with 3AB and 3AG holders. Key differences include higher breaking capacity (1 kA versus 300 A) and higher melting I²t (2440 versus 1029), which represent enhanced performance characteristics. DC cold resistance is 0.0034 Ohms, marginally lower than Littelfuse variants.

Substitution is valid when the following parameters match: current rating (20 A), voltage rating (32 V AC), fuse type (cartridge glass), response time (fast blow), physical dimensions (0.250" Dia x 1.250" L), and holder compatibility (3AB, 3AG).

Parameter Comparison

Parameter	0312020.HXP	0312020.MXP	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)
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Breaking Capacity @ Rated Voltage	300 A	300 A	300 A	1 kA	1 kA
Melting I²t	1029	1029	1029	2440	2440
DC Cold Resistance (Ohms)	0.0035	0.0035	0.0035	0.0034	0.0034
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
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 substitute parts listed maintain Active product status and are manufactured by established component suppliers with recognized approval certifications (CSA, UL, cULus). Selection between Littelfuse 312 series variants (0312020.HXP, 0312020.MXP, 0312020.VXP) is based on inventory availability and specific certification requirements. The 0312020.MXP variant offers the highest inventory level (3300 Pcs) and maintains identical electrical and mechanical specifications to the primary part.

Eaton AGC series parts (AGC-20-R, BK/AGC-20-R) provide enhanced breaking capacity (1 kA) and higher melting I²t (2440), representing superior performance characteristics while maintaining compatibility with existing 3AB and 3AG holder installations. The BK/AGC-20-R variant includes ROHS3 compliance certification. Selection of Eaton variants is appropriate when enhanced breaking capacity is required or when cross-manufacturer sourcing is necessary for supply chain continuity.

All parts comply with REACH regulations and carry EAR99 export classification. RoHS compliance status varies between ROHS3 (Littelfuse 312 series and Eaton BK/AGC-20-R) and RoHS (Eaton AGC-20-R), with no impact on functional interchangeability.

Frequently Asked Questions (FAQ)

Q: Can 0312020.MXP be used as a direct replacement for 0312020.HXP? A: Yes. Both parts are Littelfuse 312 series components with identical electrical ratings (20 A, 32 V AC), fuse type (cartridge glass), response time (fast blow), physical dimensions (0.250" Dia x 1.250" L), and holder compatibility (3AB, 3AG). Electrical performance parameters including melting I²t (1029) and DC cold resistance (0.0035 Ohms) are identical.

Q: What is the difference between Littelfuse and Eaton substitute parts? A: Littelfuse 312 series variants (0312020.HXP, 0312020.MXP, 0312020.VXP) and Eaton AGC series parts (AGC-20-R, BK/AGC-20-R) share identical electrical ratings and physical dimensions. Eaton variants feature higher breaking capacity (1 kA versus 300 A) and higher melting I²t (2440 versus 1029), representing enhanced performance. Both manufacturers' parts are compatible with 3AB and 3AG holders.

Q: Are all substitute parts compatible with 3AB and 3AG holders? A: Yes. All listed substitute parts are specified for 3AB and 3AG holder compatibility with identical physical dimensions of 0.250" Dia x 1.250" L (6.35mm x 31.75mm).

Q: What is the significance of the melting I²t difference between Littelfuse and Eaton parts? A: Melting I²t is a measure of the thermal energy required to melt the fuse element. Littelfuse 312 series parts have a melting I²t of 1029, while Eaton AGC series parts have 2440. Higher melting I²t indicates greater thermal capacity and is suitable for applications with higher inrush currents or transient conditions. Selection depends on specific application requirements.

Q: Do all substitute parts meet the same approval certifications? A: All parts carry CSA and UL certifications. The 0312020.HXP and 0312020.MXP variants include cULus certification, while 0312020.VXP, AGC-20-R, and BK/AGC-20-R carry standard UL certification. All certifications are valid for 20 A, 32 V AC/DC fuse applications.

Q: What is the difference between ROHS3 and RoHS compliance? A: ROHS3 represents the current Restriction of Hazardous Substances Directive compliance standard. RoHS (without the "3" designation) represents earlier compliance versions. Both designations indicate compliance with hazardous substance restrictions. The 0312020.HXP, 0312020.MXP, 0312020.VXP, and BK/AGC-20-R variants carry ROHS3 certification, while AGC-20-R carries RoHS certification.

Q: Can BK/AGC-20-R be used in applications requiring ROHS3 compliance? A: Yes. The BK/AGC-20-R variant is specified as ROHS3 Compliant and is suitable for applications with ROHS3 compliance requirements.

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