MJS 2.5 Equivalent & Substitute Parts

Part Overview

The MJS 2.5 is a 2.5 A 250 V AC/DC slow-blow glass cartridge fuse in 2AG package format (5mm x 15mm axial). This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing system maintenance and new designs. The MJS 2.5-R serves as the direct substitute, offering identical electrical and mechanical specifications with current product availability.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	2AG, 5mm x 15mm (Axial)
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	200 A
Melting I²t	35
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole

Substitute Part Grouping Explanation

The MJS 2.5-R qualifies as a direct substitute based on the following critical parameters:

Current Rating: 2.5 A (identical)
Voltage Rating: 250 V AC (identical)
Fuse Type: Cartridge, Glass (identical)
Package / Case: 2AG, 5mm x 15mm (identical)
Response Time: Slow Blow (identical)
Breaking Capacity: 200 A (identical)
Melting I²t: 35 (identical)
Operating Temperature Range: -55°C ~ 125°C (identical)
Mounting Type: Through Hole (identical)

These parameters define the functional and physical compatibility requirements for cartridge fuse substitution in through-hole applications.

Parameter Comparison

Parameter	MJS 2.5	MJS 2.5-R
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.
Current Rating (Amps)	2.5 A	2.5 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
Breaking Capacity @ Rated Voltage	200 A	200 A
Melting I²t	35	35
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Through Hole	Through Hole
DC Cold Resistance	0.065 Ohms	0.045 Ohms
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Approval Agency	CE, CSA, PSE, UL	CE, CSA, cULus, PSE

Engineering Selection Recommendations

The MJS 2.5-R is the appropriate selection for applications currently using the MJS 2.5. Both parts maintain identical electrical and mechanical specifications across all critical parameters. The MJS 2.5-R offers the following advantages:

Active product status ensures ongoing availability and supply chain continuity
ROHS3 compliance aligns with current environmental regulations
Improved DC cold resistance (0.045 Ohms vs. 0.065 Ohms) provides marginal performance enhancement
Expanded approval certifications (cULus addition) broaden regulatory acceptance

Direct pin-for-pin and footprint compatibility is confirmed across all mechanical and electrical dimensions.

Frequently Asked Questions (FAQ)

Q: Can MJS 2.5-R be used as a direct replacement for MJS 2.5?

A: Yes. Both parts share identical current rating (2.5 A), voltage rating (250 V AC), package format (2AG, 5mm x 15mm), response time (slow blow), and breaking capacity (200 A). Through-hole mounting compatibility is confirmed.

Q: What is the difference in DC cold resistance between these parts?

A: The MJS 2.5 has 0.065 Ohms while the MJS 2.5-R has 0.045 Ohms. This difference does not affect substitution compatibility for standard fuse applications.

Q: Why is the MJS 2.5 listed as obsolete?

A: Product obsolescence reflects manufacturer discontinuation. The MJS 2.5-R remains in active production and serves as the current equivalent.

Q: Are there compliance differences between MJS 2.5 and MJS 2.5-R?

A: The MJS 2.5-R is ROHS3 compliant, while the MJS 2.5 is non-compliant. The MJS 2.5-R includes cULus certification in addition to CE, CSA, and PSE certifications held by both parts.

Q: Is the 2AG package format standard across both parts?

A: Yes. Both parts use the 2AG cartridge format with identical dimensions of 5mm diameter x 15mm length in axial configuration.

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