MJS 7 Equivalent & Substitute Parts

Part Overview

The MJS 7 is a 7A 250VAC slow-blow glass cartridge fuse in 2AG package format (5mm x 15mm axial). This through-hole component is designed for circuit protection applications requiring moderate current ratings and slow-blow response characteristics. The main part (MJS 7) carries an obsolete product status, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Current Rating	7 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	2AG, 5mm x 15mm (Axial)
Response Time	Slow Blow
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	200A
Melting I²t	263
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.012 Ohms

Substitute Part Grouping Explanation

Substitution of the MJS 7 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must match:

Current rating: 7 A
Voltage rating: 250 V AC
Fuse type: Cartridge, Glass
Package format: 2AG, 5mm x 15mm (Axial)
Response time: Slow Blow
Breaking capacity: 200A
Melting I²t: 263
Operating temperature range: -55°C ~ 125°C
DC cold resistance: 0.012 Ohms
Mounting configuration: Through Hole

The MJS 7-R meets all these criteria and is classified as a direct substitute.

Parameter Comparison

Parameter	MJS 7 (Obsolete)	MJS 7-R (Active)
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.
Current Rating (Amps)	7 A	7 A
Voltage Rating - AC	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass
Package / Case	2AG, 5mm x 15mm (Axial)	2AG, 5mm x 15mm (Axial)
Response Time	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	200A	200A
Melting I²t	263	263
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.012 Ohms	0.012 Ohms
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Approval Agency	CE, CSA, UL	CE, CSA, cULus

Engineering Selection Recommendations

The MJS 7-R is the direct active equivalent for the obsolete MJS 7. Both parts are manufactured by Bel Fuse Inc. and share identical electrical and mechanical specifications across all critical parameters.

The MJS 7-R offers improved compliance status: it is ROHS3 compliant compared to the non-compliant MJS 7, and carries cULus certification in addition to CE and CSA approvals. For new designs and ongoing procurement, the MJS 7-R is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can MJS 7-R be used as a direct replacement for MJS 7?

A: Yes. The MJS 7-R is electrically and mechanically identical to the MJS 7 across all specified parameters, including current rating, voltage rating, package format, response time, and thermal characteristics. Both are 7A 250VAC slow-blow glass cartridge fuses in 2AG package.

Q: What is the difference between MJS 7 and MJS 7-R?

A: The primary differences are product status and compliance. MJS 7 is obsolete and RoHS non-compliant. MJS 7-R is active and ROHS3 compliant. Electrical and mechanical performance are identical.

Q: Are there any packaging differences between these parts?

A: MJS 7 is specified with "-" packaging notation, while MJS 7-R is supplied in Bulk packaging. The physical form factor and dimensions remain identical: 2AG, 5mm x 15mm (Axial), through-hole mount.

Q: What certifications apply to each part?

A: MJS 7 carries CE, CSA, and UL approvals. MJS 7-R carries CE, CSA, and cULus approvals. Both meet the same safety standards for circuit protection applications.

Q: Is the MJS 7-R suitable for new product designs?

A: Yes. The MJS 7-R is an active product with current manufacturer support and improved RoHS compliance, making it the appropriate choice for new designs requiring a 7A 250VAC slow-blow fuse in 2AG package format.

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