3SB 500-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SB 500-R is a 500 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. This component is designed for use in 3AB and 3AG fuse holders with a 1/4" x 1-1/4" form factor. The part maintains active product status with 1,898 units in current inventory. Equivalent and substitute parts are identified for applications requiring alternative sourcing, inventory management, or design flexibility while maintaining electrical and mechanical compatibility.

Substiute Parts

3SB 500-R

Bel Fuse Inc.In Stock: 20043SB 500-R Datasheet

Current PartRFQ

0313.500HXP

Littelfuse Inc.In Stock: 23640313.500HXP Datasheet

DirectRFQ

0313.500MXP

Littelfuse Inc.In Stock: 49370313.500MXP Datasheet

DirectRFQ

0313.500VXP

Littelfuse Inc.In Stock: 10450313.500VXP Datasheet

DirectRFQ

TSA-500MA

OptiFuseIn Stock: 885TSA-500MA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SB 500-R are classified into two categories based on substitution type:

Direct Manufacturer Substitutes (Littelfuse Inc. 313 Series): The parts 0314.600HXP, 0314.600MXP, and 0314.600VXP are direct substitutes manufactured by Littelfuse Inc. These parts share identical electrical specifications: 500 mA current rating, 250 V AC voltage rating, slow-blow response time, and 3AB/3AG package compatibility. All three maintain the same operating temperature range (-55°C ~ 125°C) and RoHS3 compliance. Mechanical dimensions are equivalent (0.250" Dia x 1.250" L vs. 0.250" Dia x 1.252" L for the main part), with negligible tolerance differences. These substitutes differ in breaking capacity (35A vs. 200A) and melting I²t values (2.55 vs. 4.43), but these variations remain within acceptable parameters for the 3AB/3AG holder application.

Parametric Equivalent (OptiFuse TSA Series): The TSA-500MA is a parametric equivalent that matches all critical electrical and mechanical specifications: 500 mA current rating, 250 V AC voltage rating, slow-blow response time, and identical package dimensions (0.250" Dia x 1.252" L). This part maintains the same operating temperature range and RoHS3 compliance. The TSA-500MA carries UL 248 and cULus certifications, providing regulatory equivalence to the main part.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active product status and comply with RoHS3 requirements. Selection between substitutes depends on regulatory certification requirements and application context.

The Littelfuse 313 series (0314.600HXP, 0314.600MXP, 0314.600VXP) are direct substitutes with CE, CSA, and UL certifications. These parts are functionally equivalent for applications requiring these specific regulatory approvals. The three variants differ only in internal construction characteristics; electrical and mechanical performance are identical.

The OptiFuse TSA-500MA provides an alternative with cULus and UL 248 certifications. This part is suitable for applications where UL 248 compliance is specified or preferred.

All substitute parts are compatible with 3AB and 3AG fuse holders and maintain the required operating temperature range for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 313 series parts be used interchangeably with the 3SB 500-R?

A: Yes. The 0314.600HXP, 0314.600MXP, and 0314.600VXP share identical electrical ratings (500 mA, 250 V AC), response time (slow-blow), and package specifications (3AB/3AG, 1/4" x 1-1/4"). All three are mechanically compatible with existing fuse holders designed for the 3SB 500-R.

Q: What is the difference between the three Littelfuse 313 variants?

A: The 0314.600HXP, 0314.600MXP, and 0314.600VXP are electrically and mechanically identical. Differences exist in internal construction and breaking capacity ratings (all rated at 35A), but these do not affect compatibility or performance in standard 3AB/3AG holder applications.

Q: Is the OptiFuse TSA-500MA a direct substitute?

A: The TSA-500MA is a parametric equivalent. It matches all critical electrical specifications (500 mA, 250 V AC, slow-blow) and mechanical dimensions (0.250" Dia x 1.252" L). It is physically compatible with 3AB/3AG fuse holders. Regulatory certifications differ (UL 248 vs. cULus), so application requirements should be verified.

Q: Are there any dimensional differences between these parts?

A: The Littelfuse 313 series parts measure 0.250" Dia x 1.250" L, while the 3SB 500-R and TSA-500MA measure 0.250" Dia x 1.252" L. These differences (0.002" in length) are within standard manufacturing tolerances and do not affect holder compatibility.

Q: Do all substitute parts meet the same regulatory standards?

A: All parts are RoHS3 compliant. Certification agencies differ: the 3SB 500-R carries CE, CSA, and cULus; the Littelfuse 313 series carries CE, CSA, and UL; the TSA-500MA carries cULus and UL 248. Application requirements should determine which certifications are necessary.

Q: What is the inventory status of these substitute parts?

A: Current inventory levels are: 0314.600MXP (4,917 units), 0314.600HXP (2,295 units), 0314.600VXP (976 units), and TSA-500MA (827 units). All parts are available as new original stock.