Bel Fuse Inc. 3AP 1.6 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 3AP 1.6 is a 1.6 A, 250 V AC/DC fast-blow glass cartridge fuse in 3AB/3AG package format with axial through-hole mounting. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The part maintains full electrical and mechanical compatibility with active alternatives from Littelfuse Inc., enabling direct replacement in existing applications.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	200 A

Substitute Part Grouping Explanation

Substitution eligibility for the 3AP 1.6 is determined by strict equivalence across the following parameters:

Current Rating: 1.6 A (exact match required)
Voltage Rating (AC): 250 V (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" (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three Littelfuse Inc. substitute parts (031801.6HXP, 031801.6MXP, 031801.6VXP) meet these criteria and are classified as active products with current manufacturing status and improved RoHS3 compliance.

Parameter Comparison

Parameter	3AP 1.6 (Bel Fuse)	031801.6HXP (Littelfuse)	031801.6MXP (Littelfuse)	031801.6VXP (Littelfuse)
Current Rating (Amps)	1.6 A	1.6 A	1.6 A	1.6 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.272" Dia x 1.280" L (6.90mm x 32.50mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	0.084 Ohms	0.0934 Ohms	0.0934 Ohms	0.0934 Ohms
Breaking Capacity @ Rated Voltage	200 A	100 A	100 A	100 A
Melting I²t	4.2	2.8	2.8	2.8
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

The three Littelfuse Inc. substitute parts (031801.6HXP, 031801.6MXP, 031801.6VXP) are functionally equivalent to the obsolete 3AP 1.6 across all critical electrical and mechanical parameters. Selection among these three substitutes is based on availability and packaging requirements, as all three are identical in electrical performance and certifications.

Key advantages of Littelfuse substitutes:

Active product status ensures long-term availability and supply chain continuity
ROHS3 compliance meets current environmental and regulatory requirements
Expanded approval agency certifications (addition of KC certification)
Identical electrical ratings and thermal operating range

Minor dimensional variations (0.275" Dia x 1.288" L versus 0.272" Dia x 1.280" L) remain within standard mechanical tolerances for 3AB/3AG package specifications and do not affect circuit board layout or mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 031801.6HXP, 031801.6MXP, or 031801.6VXP directly replace the Bel Fuse 3AP 1.6?

A: Yes. All three Littelfuse parts are direct electrical and mechanical equivalents. They share identical current ratings (1.6 A), voltage ratings (250 V AC), fuse type (cartridge glass), response time (fast blow), package format (3AB/3AG), and operating temperature range (-55°C ~ 125°C). Through-hole mounting is identical.

Q: What is the difference between the three Littelfuse substitute parts?

A: The 031801.6HXP, 031801.6MXP, and 031801.6VXP are electrically and mechanically identical. Differences exist only in packaging format (all listed as Bulk) and inventory availability. Selection should be based on procurement requirements and supplier stock levels.

Q: Are there dimensional differences between the original and substitute parts?

A: Minor dimensional variations exist. The original 3AP 1.6 measures 0.272" Dia x 1.280" L (6.90mm x 32.50mm), while Littelfuse substitutes measure 0.275" Dia x 1.288" L (6.99mm x 32.72mm). These variations remain within standard 3AB/3AG package tolerances and do not affect circuit board compatibility or mechanical fit.

Q: What is the impact of the lower breaking capacity in Littelfuse parts?

A: The original 3AP 1.6 has a breaking capacity of 200 A, while Littelfuse substitutes have 100 A. Both values exceed typical circuit protection requirements for 1.6 A fuses. Application-specific breaking capacity requirements must be evaluated against actual system fault current levels.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three Littelfuse substitute parts are ROHS3 compliant, meeting current environmental regulations. The original 3AP 1.6 is RoHS non-compliant.

Q: What certifications do the substitute parts carry?

A: Littelfuse substitutes carry CE, CSA, KC, PSE, and UL certifications. The original part carries CE, CSA, PSE, and UL certifications. The addition of KC certification in substitutes provides expanded regional compliance.

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