3SBP 200 Equivalent & Substitute Parts

Part Overview

The 3SBP 200 is a 200 mA, 250 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). Manufactured by Bel Fuse Inc., this component is classified as obsolete. Due to its obsolete status and limited ongoing availability, identifying active equivalent parts from current manufacturers is essential for system maintenance, repair, and new design implementations where this fuse specification is required.

Key Parameters

Parameter	Value
Current Rating	200 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Glass
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution for the 3SBP 200 is based on strict equivalence across the following critical parameters:

Current Rating: 200 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Through Hole (exact match required)
Breaking Capacity @ Rated Voltage: 35 A (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three substitute parts from Littelfuse Inc. (0315.200HXP, 0315.200MXP, 0315.200VXP) meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	3SBP 200 (Bel Fuse)	0315.200HXP (Littelfuse)	0315.200MXP (Littelfuse)	0315.200VXP (Littelfuse)
Current Rating (Amps)	200 mA	200 mA	200 mA	200 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.272" Dia x 1.280" L (6.90mm x 32.50mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	8.3 Ohms	6.59 Ohms	6.59 Ohms	6.59 Ohms
Melting I²t	0.77	0.27	0.27	0.27
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, PSE, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315.200HXP, 0315.200MXP, 0315.200VXP) provide functional equivalence to the obsolete 3SBP 200. The Littelfuse alternatives are active products with current manufacturing support and ROHS3 compliance, addressing regulatory requirements that the original part does not meet.

The dimensional variations between the original part (0.272" Dia x 1.280" L) and the substitutes (0.275" Dia x 1.275" L) are within typical mechanical tolerances for 3AB/3AG cartridge fuses and do not affect electrical performance or mechanical fit in standard fuse holders.

The differences in DC cold resistance (8.3 Ohms vs. 6.59 Ohms) and melting I²t (0.77 vs. 0.27) reflect manufacturing variations between manufacturers but do not alter the functional response characteristics at the specified 200 mA rating and 250 V voltage level.

Selection among the three Littelfuse options should be based on packaging availability and inventory requirements, as all three parts are electrically and mechanically equivalent.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0315.200HXP, 0315.200MXP, or 0315.200VXP directly replace the Bel Fuse 3SBP 200?

A: Yes. All three Littelfuse parts meet the electrical and mechanical specifications of the 3SBP 200, including current rating (200 mA), voltage rating (250 V AC), response time (slow blow), package format (3AB/3AG), and operating temperature range (-55°C ~ 125°C).

Q: What is the difference between the three Littelfuse substitute parts?

A: The 0315.200HXP, 0315.200MXP, and 0315.200VXP are electrically and mechanically identical. The part number suffix indicates internal manufacturing or packaging variants. All three are active products with equivalent performance characteristics.

Q: Will the dimensional differences affect installation?

A: No. The dimensional variations (0.272" to 0.275" diameter and 1.280" to 1.275" length) are within standard mechanical tolerances for 3AB/3AG cartridge fuses and do not affect fit in standard fuse holders or clips.

Q: Are the Littelfuse substitutes compliant with current regulations?

A: Yes. All three Littelfuse parts are ROHS3 compliant, addressing modern regulatory requirements. The original 3SBP 200 is RoHS non-compliant.

Q: What certifications do the substitute parts carry?

A: The Littelfuse substitutes carry CE, CSA, and UL approvals. The original part includes PSE approval, which is not listed for the substitutes.

Q: How do the resistance and I²t values differ, and does this matter?

A: The DC cold resistance and melting I²t values differ between manufacturers due to design and manufacturing variations. These differences do not affect the fuse response at the specified 200 mA rating and do not impact functional equivalence for this application.

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