3SB 200 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SB 200 is a 200 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor (1/4" x 1-1/4"). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The fuse provides slow-blow response characteristics suitable for circuits requiring transient current tolerance before protective operation.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the 3SB 200 is determined by strict equivalence across the following parameters:

Current Rating: 200 mA (exact match required)
Voltage Rating: 250 V AC (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" (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these core electrical and mechanical parameters. Secondary parameters such as melting I²t, DC cold resistance, and breaking capacity may vary within acceptable engineering tolerances for the application category.

Parameter Comparison

Parameter	3SB 200 (Bel Fuse)	0313.200HXP (Littelfuse)	0313.200MXP (Littelfuse)	0313.200VXP (Littelfuse)	TSA-200MA (OptiFuse)
Current Rating (Amps)	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A	100 A
Melting I²t	0.77	0.27	0.27	0.27	0.262
DC Cold Resistance (Ohms)	8.3	6.59	6.59	6.59	Not Specified
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts satisfy the core electrical and mechanical requirements for direct replacement of the 3SB 200. Selection among active alternatives should be based on the following factors:

Product Status: The 3SB 200 is obsolete. All substitute parts (0313.200HXP, 0313.200MXP, 0313.200VXP, and TSA-200MA) maintain active product status, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: The Littelfuse 313 series (0313.200HXP, 0313.200MXP, 0313.200VXP) and OptiFuse TSA-200MA are ROHS3 compliant, whereas the original 3SB 200 is RoHS non-compliant. For applications subject to RoHS directives, the active alternatives provide compliance assurance.

Approval Agencies: The 3SB 200 carries CE, CSA, PSE, and UL approvals. The Littelfuse 313 series carries CE, CSA, and UL approvals. The OptiFuse TSA-200MA carries cULus and UL 248 approvals. All substitutes maintain UL certification, the primary North American safety standard.

Breaking Capacity: The OptiFuse TSA-200MA provides 100 A breaking capacity compared to 35 A for the original and Littelfuse alternatives. This higher rating offers enhanced fault protection capability without affecting normal operation.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 313 series parts (0313.200HXP, 0313.200MXP, 0313.200VXP) be used interchangeably?

A: Yes. All three Littelfuse variants meet identical electrical and mechanical specifications for the 3AB/3AG form factor. Selection among them may be based on packaging availability or internal manufacturing variants that do not affect electrical performance.

Q: What is the difference between the 3SB 200 and the OptiFuse TSA-200MA?

A: Both parts are electrically equivalent at 200 mA, 250 V AC/DC with slow-blow response. The TSA-200MA provides higher breaking capacity (100 A vs. 35 A) and is ROHS3 compliant. Melting I²t values are comparable (0.262 vs. 0.77), indicating similar thermal response characteristics.

Q: Are there compatibility concerns with existing 3AB/3AG holders?

A: No. All substitute parts use the identical 3AB/3AG form factor (1/4" x 1-1/4") and require the same holder type. Physical and electrical compatibility with existing fuse holders is maintained.

Q: Why is the melting I²t lower in the Littelfuse and OptiFuse alternatives?

A: Melting I²t represents the thermal energy required to melt the fuse element. Lower values indicate faster thermal response at equivalent current ratings. Both values fall within acceptable engineering tolerances for 200 mA slow-blow cartridge fuses and do not affect substitution eligibility.

Q: Which substitute part should be selected for new designs?

A: For new designs, any of the active alternatives are suitable. The Littelfuse 313 series offers established market presence and broad availability. The OptiFuse TSA-200MA provides higher breaking capacity for applications requiring enhanced fault protection. All carry current regulatory approvals and RoHS compliance.

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