C1S 3 Equivalent & Substitute Parts

Part Overview

The C1S 3 is a 3A surface mount board fuse manufactured by Bel Fuse Inc., rated for 63V AC/DC operation in a 1206 (3216 Metric) package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The slow blow response characteristic and board mount configuration make this fuse suitable for general circuit protection applications requiring moderate current ratings and voltage tolerance.

Substiute Parts

C1S 3

Bel Fuse Inc.In Stock: 929C1S 3 Datasheet

Current PartRFQ

0468003.NR

Littelfuse Inc.In Stock: 210280468003.NR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the C1S 3 is determined by the following critical parameters:

• Current Rating: Must be 3 A (exact match required)
• Mounting Type: Must be Surface Mount
• Package / Case: Must be 1206 (3216 Metric)
• Response Time: Must be Slow Blow
• Fuse Type: Must be Board Mount (Cartridge Style Excluded)

The substitute part 0468003.NR (Littelfuse Inc. SlimLine™ 468 series) meets all mandatory electrical and mechanical compatibility criteria. However, the voltage rating differential (32V AC/DC vs. 63V AC/DC) represents a functional limitation that must be evaluated within the specific circuit application context.

Parameter Comparison

Engineering Selection Recommendations

The 0468003.NR (Littelfuse SlimLine™ 468) is electrically and mechanically compatible with the C1S 3 for applications operating at or below 32V AC/DC. Both components share identical current ratings, response characteristics, and package specifications, with equivalent breaking capacity and RoHS3 compliance status.

The C1S 3 operates across a broader voltage range (63V) and higher temperature ceiling (125°C maximum), while the 0468003.NR is limited to 32V operation and 90°C maximum temperature. The 0468003.NR exhibits lower DC cold resistance (0.0195 Ohms vs. 0.05 Ohms) and higher melting I²t (1.27 vs. 0.83), indicating different thermal response characteristics.

Selection between these components depends on circuit voltage requirements. For circuits operating above 32V, the C1S 3 voltage rating is mandatory. For circuits at or below 32V, the 0468003.NR provides an active-status alternative with current UL and CSA certifications.

Frequently Asked Questions (FAQ)

Q: Can the 0468003.NR replace the C1S 3 in all applications?

A: No. The 0468003.NR is rated for maximum 32V AC/DC operation, while the C1S 3 is rated for 63V. Substitution is valid only for circuits operating at or below 32V. Exceeding this voltage rating voids the fuse's protective function and certification.

Q: What is the significance of the different melting I²t values?

A: The melting I²t parameter defines the thermal energy required to melt the fuse element. The C1S 3 (0.83) melts faster than the 0468003.NR (1.27) under identical overcurrent conditions. This difference affects trip time and must be evaluated against circuit protection requirements.

Q: Are both components RoHS3 compliant?

A: Yes. Both the C1S 3 and 0468003.NR are ROHS3 compliant and REACH unaffected, meeting current environmental regulatory requirements.

Q: Why does the C1S 3 have a higher operating temperature maximum?

A: The C1S 3 operates to -55°C ~ 125°C, while the 0468003.NR operates to -55°C ~ 90°C. Applications requiring operation above 90°C require the C1S 3 or equivalent high-temperature rated alternatives.

Q: What certifications apply to each component?

A: The C1S 3 carries CE and cURus approvals. The 0468003.NR carries CSA and UL approvals. Both certifications are recognized for industrial and commercial applications; selection depends on regional regulatory requirements.

Q: Are the physical dimensions identical?

A: Dimensions are nearly identical. C1S 3: 0.126" L x 0.062" W x 0.023" H (3.20mm x 1.58mm x 0.58mm). 0468003.NR: 0.125" L x 0.060" W x 0.023" H (3.18mm x 1.52mm x 0.58mm). Both fit the 1206 (3216 Metric) package footprint.