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OptiFuse FMS4A Micro Fuse

This fast-acting micro fuse features a round thermoplastic body with short radial leads, designed for quick installation and reliable overcurrent protection. Rated at 4A and 250V, it uses a silver alloy element and copper alloy tin-plated pins, meeting UL/CSA standards for circuit protection. Suitable for electronic devices requiring quick response to overcurrent conditions, it is constructed to provide durability and safety in various electrical applications. Proper use within specified ratings prevents damage, electrical arcing, and potential fire hazards, ensuring system integrity and efficiency.

Authorized Distributors
Source:DigiKey
Part No:FMS-4A
Stock:825
Inv Date:06-05-2026
Price: Unit price: $1.6
Buy/RFQ:
Part No:FMS-4A
Stock:0
Inv Date:06-05-2026
Price: Unit price: $1.6
Buy/RFQ:
Part No:FMS-4A
Stock:0
Inv Date:06-05-2026
Price: Unit price: $0.9673
Buy/RFQ:
Part No:FMS-4A
Stock:0
Inv Date:06-05-2026
Price: Unit price: $0.9673
Buy/RFQ:

OptiFuse FMS4A Micro Fuse Specifications:

  • Body Material: Thermoplastic UL94V0
  • Pin Material: Copper Alloy, Tin plated
  • Element: Silver Alloy
  • Rated Current: 4A
  • Voltage Rating: 250V
  • Interrupt Rating: 50A at 250 VAC
  • Mounting Holes: Yes
  • Lead Type: Radial, Short Leads
  • Size: Standard North American round body
  • Compliance: UL and CSA Certified
  • Operation: Fast-acting, designed for single overcurrent event
  • Operating Conditions: Avoid contact with chemicals or prolonged overcurrent
  • Contact Resistance: Low for reliable conductivity
  • Dimensions (Approximate): Diameter: 0.3 inches, Length: 0.6 inches
  • Temperature Range: -55°C to +85°C
  • Certifications: UL Listed, CSA Certified

Buy the Optifuse Series Micro Fuse: FMS4A

Purchase the Optifuse FMS4A micro fuse online today—designed for fast-acting, reliable overcurrent protection in electronic circuits. Featuring radial leads for easy installation, UL/CSA compliance, and high durability, this fuse ensures safety and efficiency. Perfect for sensitive electronic devices requiring precise overcurrent interruption, it withstands typical circuit conditions, providing dependable performance. Order now to secure a component crafted for safety and longevity, ensuring your projects run smoothly and safely with optimal circuit protection.

Get Optifuse FMS4A micro fuse today—engineered for quick response and long-lasting reliability in electronic safety systems.

Frequently Asked Questions

Where can I buy OptiFuse FMS4A?

You can click on the BUY or RFQ button to purchase FMS4A from an authorized OptiFuse distributor.

How do I troubleshoot issues or seek technical support for part FMS4A?

You can download the FMS4A datasheet or visit the OptiFuse website for support.

Who is the manufacturer of FMS4A?

OptiFuse

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