Equivalent & Substitute Parts for 3AP 7 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 3AP 7 is a 7 A 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in 3AB/3AG form factor. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. The fuse provides 200 A breaking capacity at rated voltage and operates across -55°C to 125°C temperature range with CE, CSA, PSE, and UL approvals.

Key Parameters

Parameter	Value
Current Rating	7 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Response Time	Fast Blow
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	200 A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (7 A), voltage rating (250 V AC), fuse type (cartridge glass), package form factor (3AB/3AG, 1/4" x 1-1/4"), response time (fast blow), mounting type (through hole), and breaking capacity (200 A). All substitute parts listed meet these core electrical and mechanical requirements.

The Littelfuse Inc. 318 series parts (0318007.HXP, 0318007.MXP, 0318007.VXP) are direct manufacturer equivalents with active product status and RoHS3 compliance. The Eaton BK/AGC-V-7 is classified as a similar substitute, meeting all functional parameters while maintaining the same form factor and electrical ratings.

Parameter Comparison

Parameter	3AP 7 (Bel Fuse)	0318007.HXP (Littelfuse)	0318007.MXP (Littelfuse)	0318007.VXP (Littelfuse)	BK/AGC-V-7 (Eaton)
Current Rating (Amps)	7	7	7	7	7
Voltage Rating - AC (V)	250	250	250	250	250
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
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"
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Breaking Capacity @ Rated Voltage (A)	200	200	200	200	200
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Melting I²t	141	118	118	118	195.02
DC Cold Resistance (Ohms)	0.013	0.0146	0.0146	0.0146	0.012
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS non-compliant
Approval Agency	CE, CSA, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CSA, UL

Engineering Selection Recommendations

For new designs and ongoing maintenance applications, the Littelfuse 318 series (0318007.HXP, 0318007.MXP, 0318007.VXP) are preferred substitutes due to active product status and RoHS3 compliance. All three variants are electrically and mechanically equivalent, with availability exceeding 600 units in stock.

The Eaton BK/AGC-V-7 remains a viable alternative where RoHS compliance is not required and CSA/UL certifications are sufficient. This part maintains full electrical equivalence and is actively produced.

Selection between Littelfuse variants should be based on packaging requirements and supply chain considerations, as all three deliver identical electrical performance and certifications.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0318007.HXP, 0318007.MXP, and 0318007.VXP be used interchangeably?

A: Yes. All three Littelfuse variants share identical electrical ratings (7 A, 250 V AC), fuse type (cartridge glass), package form factor (3AB/3AG), response time (fast blow), and breaking capacity (200 A). Differences in part number designation reflect internal manufacturing or packaging variations only.

Q: What is the difference between the 3AP 7 and Littelfuse 318 series substitutes?

A: The primary differences are product status (3AP 7 is obsolete; 318 series are active) and RoHS compliance (3AP 7 is non-compliant; 318 series are RoHS3 compliant). Electrical and mechanical parameters are equivalent. Melting I²t values differ slightly (141 vs. 118), but both meet the 200 A breaking capacity requirement at rated voltage.

Q: Is the Eaton BK/AGC-V-7 a direct equivalent to the 3AP 7?

A: The Eaton BK/AGC-V-7 meets all core electrical and mechanical requirements: 7 A current rating, 250 V AC voltage rating, cartridge glass fuse type, 3AB/3AG package, fast-blow response, and 200 A breaking capacity. It is classified as a similar substitute rather than a direct equivalent due to different manufacturer design and higher melting I²t value (195.02 vs. 141).

Q: Does the 3AB/3AG package form factor ensure physical compatibility?

A: Yes. All listed parts conform to the 3AB/3AG standard with 1/4" x 1-1/4" (axial) dimensions. Physical dimensions vary slightly between manufacturers (0.266" to 0.275" diameter, 1.280" to 1.292" length), but remain within standard tolerance for through-hole mounting applications.

Q: Which substitute offers the best compliance profile?

A: The Littelfuse 318 series (0318007.HXP, 0318007.MXP, 0318007.VXP) provide the most comprehensive compliance: RoHS3 compliant, active product status, and expanded approval agency coverage (CE, CSA, KC, PSE, UL). These are recommended for applications requiring modern regulatory compliance.

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