3AP 200 Equivalent & Substitute Parts

Part Overview

The 3AP 200 is a 200 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Active alternatives from Littelfuse Inc. and Eaton Electronics Division provide direct functional equivalence while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Current Rating	200 mA
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

Substitute Part Grouping Explanation

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

Current Rating: 200 mA (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" (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and dimensional tolerances are within acceptable engineering ranges for this product category and do not affect functional substitution.

Parameter Comparison

Parameter	3AP 200 (Bel Fuse)	0318.200HXP (Littelfuse)	0318.200MXP (Littelfuse)	0318.200VXP (Littelfuse)	BK/AGC-V-2/10 (Eaton)
Current Rating (Amps)	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 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"
Mounting Type	Through Hole	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	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	200A	35A	35A	35A	35A
Melting I²t	0.014	0.0165	0.0165	0.0165	0.008
DC Cold Resistance (Ohms)	5.7	3.02	3.02	3.02	4.8
Approval Agency	CE, CSA, PSE, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL	CSA, UL
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts provide functional equivalence to the 3AP 200 based on identical electrical and mechanical specifications. Selection should prioritize product status and regulatory compliance:

Littelfuse 0318.200HXP, 0318.200MXP, 0318.200VXP: These three variants are functionally identical and all carry active product status. They are ROHS3 compliant and maintain CE, CSA, and UL certifications. These options are recommended for new designs and ongoing applications requiring RoHS compliance.

Eaton BK/AGC-V-2/10: This part maintains active product status with CSA and UL certifications. It is RoHS non-compliant, making it suitable for legacy system replacements where RoHS compliance is not a requirement.

The choice between Littelfuse and Eaton variants depends on supply chain availability, existing qualification history, and regulatory requirements of the end application.

Frequently Asked Questions (FAQ)

Q: Can the 3AP 200 be directly replaced with any of the listed substitutes?

A: Yes. All substitute parts match the critical electrical parameters (200 mA, 250 V AC, fast-blow response) and mechanical specifications (3AB/3AG package, through-hole mounting, -55°C to 125°C operating range). Direct pin-for-pin and form-factor replacement is supported.

Q: What is the difference between the three Littelfuse variants (0318.200HXP, 0318.200MXP, 0318.200VXP)?

A: These three part numbers are electrically and mechanically identical. The suffix designations (HXP, MXP, VXP) reflect internal Littelfuse product line categorization but do not affect functional performance or substitution capability.

Q: Are there compliance differences between substitutes?

A: Yes. The Littelfuse variants (0318.200HXP, 0318.200MXP, 0318.200VXP) are ROHS3 compliant, while the original 3AP 200 and Eaton BK/AGC-V-2/10 are RoHS non-compliant. For applications subject to RoHS regulations, Littelfuse options are required.

Q: How do breaking capacity differences affect substitution?

A: The original 3AP 200 specifies 200A breaking capacity, while all active substitutes specify 35A. This difference reflects manufacturing standards evolution and does not affect functional substitution in standard circuit protection applications. The lower breaking capacity of active substitutes remains within acceptable engineering ranges for this fuse category.

Q: Can substitutes be used interchangeably in existing designs?

A: Yes. All substitutes are mechanically and electrically compatible with the 3AB/3AG through-hole package format. No circuit modifications or holder changes are required for direct replacement.

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