3SBP 100 Equivalent & Substitute Parts

Part Overview

The 3SBP 100 is a 100 mA, 250 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG package format with through-hole mounting. Manufactured by Bel Fuse Inc., this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent substitute parts from active manufacturers is necessary for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CE, CSA, PSE, UL

Substitute Part Grouping Explanation

Substitute parts for the 3SBP 100 are qualified based on the following electrical and mechanical parameters:

Current Rating: 100 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (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. (0315.100HXP, 0315.100MXP, 0315.100VXP) meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	3SBP 100 (Bel Fuse)	0315.100HXP (Littelfuse)	0315.100MXP (Littelfuse)	0315.100VXP (Littelfuse)
Current Rating (Amps)	100 mA	100 mA	100 mA	100 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
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)
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
Product Status	Obsolete	Active	Active	Active
Approval Agency	CE, CSA, PSE, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315.100HXP, 0315.100MXP, 0315.100VXP) are functionally equivalent to the 3SBP 100 based on electrical and mechanical parameters. The substitute parts offer the following advantages:

Active product status with ongoing manufacturing support
ROHS3 compliance, compared to the non-compliant original part
Maintained certifications (CE, CSA, UL) covering primary regulatory requirements
Equivalent breaking capacity and operating temperature range
Identical package and mounting specifications for direct board-level replacement

Selection among the three substitute options may be based on packaging availability (all listed as Bulk) and inventory levels.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0315.100HXP, 0315.100MXP, or 0315.100VXP be used as direct replacements for the 3SBP 100?

A: Yes. All three Littelfuse parts match the required electrical parameters (100 mA, 250 V AC, slow-blow response) and mechanical specifications (3AB/3AG package, through-hole mounting, 1/4" x 1-1/4" dimensions). They are electrically and mechanically interchangeable.

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

A: The 0315.100HXP, 0315.100MXP, and 0315.100VXP are functionally identical in all provided electrical and mechanical parameters. Differences, if any, are not specified in the available technical data.

Q: Does the RoHS compliance difference affect substitution?

A: The original 3SBP 100 is RoHS non-compliant, while all Littelfuse substitutes are ROHS3 compliant. For new designs or systems requiring RoHS compliance, the Littelfuse parts are the appropriate choice. For legacy system maintenance, compliance requirements depend on application and regulatory context.

Q: Are the physical dimensions identical between the original and substitute parts?

A: The original 3SBP 100 has dimensions of 0.272" Dia x 1.280" L (6.90mm x 32.50mm). The Littelfuse substitutes have dimensions of 0.275" Dia x 1.275" L (6.99mm x 32.39mm). These minor dimensional variations remain within the 3AB/3AG package specification and do not affect through-hole mounting compatibility.

Q: What certifications do the substitute parts carry?

A: The Littelfuse substitutes carry CE, CSA, and UL certifications. The original part additionally carried PSE certification. For applications requiring PSE certification, this difference should be evaluated against specific regulatory requirements.

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