3SB 160 Equivalent & Substitute Parts

Part Overview

The 3SB 160 is a 160 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. This component is classified as obsolete, requiring identification of functionally equivalent alternatives for continued system support and procurement planning. The 3SB 160 operates within the 3AB/3AG holder standard and is designed for applications requiring slow-blow response characteristics with a 35A breaking capacity at rated voltage.

Substiute Parts

3SB 160

Bel Fuse Inc.In Stock: 10493SB 160 Datasheet

Current PartRFQ

0034.5209

SCHURTER Inc.In Stock: 10480034.5209 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3SB 160 is determined by the following critical parameters:

• Current Rating: 160 mA nominal
• Voltage Rating: 250 V AC minimum
• Response Time: Slow Blow characteristic
• Package Compatibility: 3AB/3AG holder standard, 1/4" x 1-1/4" form factor
• Breaking Capacity: 35 A at rated voltage
• Operating Temperature: -55°C to 125°C range
• Fuse Type: Glass cartridge construction

The substitute part 0034.5209 (SCHURTER Inc., FST 6.3x32 series) meets the mechanical and electrical envelope requirements for direct substitution, with the exception of current rating variance and compliance profile differences noted in the parameter comparison.

Parameter Comparison

Engineering Selection Recommendations

The 0034.5209 (SCHURTER Inc.) fuse provides mechanical and thermal compatibility with the 3SB 160 within the 3AB/3AG holder standard. Selection between these parts requires evaluation of the following factors:

Current Rating Variance: The SCHURTER part operates at 150 mA versus the original 160 mA specification. This 10 mA reduction results in a lower trip threshold and should be verified against circuit protection requirements.

Compliance Profile: The SCHURTER part achieves ROHS3 compliance, whereas the original 3SB 160 is RoHS non-compliant. Regulatory requirements for the end application determine whether this compliance advantage is necessary.

Certification Coverage: The original part carries CE, CSA, PSE, and UL certifications. The SCHURTER substitute carries CSA and UL certifications only. Applications requiring CE or PSE certification must account for this limitation.

Thermal Characteristics: The SCHURTER part exhibits a melting I²t value of 0.44 compared to 0.5 for the original, indicating a lower thermal energy tolerance. Circuit inrush current profiles must be evaluated to ensure compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 0034.5209 be used as a direct replacement for the 3SB 160?

A: The 0034.5209 is mechanically compatible with the 3AB/3AG holder standard and shares identical voltage rating, response time, and breaking capacity. However, the 10 mA current rating difference and lower melting I²t value require circuit-level verification before substitution.

Q: What is the significance of the current rating difference between 160 mA and 150 mA?

A: The 150 mA rating of the SCHURTER part will trip at a lower sustained current level than the original 160 mA specification. Applications operating near the 160 mA threshold may experience nuisance trips with the substitute part.

Q: Are there certification implications for using the SCHURTER substitute?

A: The SCHURTER part does not carry CE or PSE certifications present on the original 3SB 160. Applications requiring these certifications must either source an alternative substitute or maintain the original part specification.

Q: How do the dimensional differences affect installation?

A: The 0.002" length variance (1.252" versus 1.250") is negligible and does not affect mechanical fit within standard 3AB/3AG holders.

Q: What does the melting I²t parameter indicate?

A: Melting I²t represents the thermal energy required to melt the fuse element. The SCHURTER part's lower value (0.44 versus 0.5) means it will respond to thermal stress more quickly, potentially affecting circuit behavior during transient inrush conditions.

Q: Is RoHS3 compliance a requirement for substitution?

A: RoHS3 compliance is application-dependent. If the end product requires RoHS3 certification, the SCHURTER substitute provides this advantage over the non-compliant original part.