GSAP 250-R Equivalent & Substitute Parts

Part Overview

The GSAP 250-R is a 250 mA, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. in a 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and component procurement.

The fuse is designed for through-hole mounting applications requiring slow-blow response characteristics and operates across a temperature range of -55°C to 125°C. Due to its obsolete status, sourcing direct replacements from the original manufacturer may be limited, necessitating evaluation of substitute components that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	250 mA
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow 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	35A

Substitute Part Grouping Explanation

Substitution of the GSAP 250-R is determined by the following critical parameters:

Current Rating: Must be 250 mA
Voltage Rating - AC: Must be 250 V minimum
Fuse Type: Must be Cartridge, Ceramic
Response Time: Must be Slow Blow
Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type: Must be Through Hole
Operating Temperature Range: Must support -55°C ~ 125°C

The substitute part 0325.250MXP manufactured by Littelfuse Inc. meets all critical electrical and mechanical parameters. Both components share identical current ratings, AC voltage ratings, fuse type classification, response characteristics, and physical package dimensions. Both operate within the same temperature range and are approved for the same regulatory standards.

Parameter Comparison

Parameter	GSAP 250-R (Bel Fuse Inc.)	0325.250MXP (Littelfuse Inc.)
Current Rating (Amps)	250 mA	250 mA
Voltage Rating - AC	250 V	250 V
Voltage Rating - DC	Not specified	125 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole	Through Hole
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35A	100A AC, 10kA DC
Melting I²t	1.2	0.432
DC Cold Resistance	5 Ohms	4.43 Ohms
Product Status	Obsolete	Active
Approval Agency	CE, CSA, cULus	CE, CSA, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 0325.250MXP from Littelfuse Inc. is a direct functional equivalent for the obsolete GSAP 250-R. Both components satisfy identical electrical specifications for AC voltage and current ratings, ceramic cartridge construction, and slow-blow response characteristics. Physical dimensions and through-hole mounting compatibility are equivalent.

The substitute part carries active product status, ensuring continued availability and supply chain reliability. Both components maintain ROHS3 compliance and are approved by CE, CSA, and UL certification bodies, meeting the same regulatory requirements.

The 0325.250MXP provides enhanced breaking capacity (100A AC, 10kA DC versus 35A) and lower melting I²t value (0.432 versus 1.2), representing improved performance characteristics. The substitute also specifies DC voltage rating of 125 V, providing additional operational flexibility for applications requiring DC circuit protection.

Frequently Asked Questions (FAQ)

Q: Can the 0325.250MXP replace the GSAP 250-R in existing applications?

A: Yes. Both components share identical current ratings (250 mA), AC voltage ratings (250 V), ceramic cartridge construction, slow-blow response, and 3AB/3AG package dimensions. Physical compatibility and electrical performance are equivalent for AC circuit applications.

Q: What is the significance of the DC voltage rating difference?

A: The GSAP 250-R does not specify a DC voltage rating, while the 0325.250MXP specifies 125 V DC. For AC-only applications, this difference is not relevant. For circuits requiring DC protection, the 0325.250MXP provides specified DC capability.

Q: Are there differences in breaking capacity between these components?

A: Yes. The GSAP 250-R has a breaking capacity of 35A at rated voltage, while the 0325.250MXP has 100A AC and 10kA DC. The substitute provides higher breaking capacity, which is compatible with the original application requirements.

Q: Do both components meet the same regulatory standards?

A: Both components are CE, CSA, and UL approved. The GSAP 250-R includes cULus certification, while the 0325.250MXP includes standard UL certification. Both meet equivalent regulatory requirements for ceramic cartridge fuses.

Q: What is the difference in melting I²t values?

A: The GSAP 250-R has a melting I²t of 1.2, while the 0325.250MXP has 0.432. The lower I²t value of the substitute indicates faster thermal response. For applications designed around the original component's thermal characteristics, this difference should be evaluated against circuit protection requirements.

Q: Are both components RoHS compliant?

A: Yes. Both the GSAP 250-R and 0325.250MXP are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

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