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0451003.MRL

3A 125VAC slow-blow fuse, 5x20mm ceramic

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Manufacturer Part：

0451003.MRL

Package：

5x20mm ceramic

Brand：
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Description

Product Overview

The 0451003.MRL from Littelfuse is a 3A 125VAC time-delay (slow-blow) ceramic fuse in 5x20mm package for overcurrent protection in power supplies and transformers.

Key Specifications

Package 5x20mm ceramic

Features

  • See datasheet for complete specifications
  • Industry-standard package

Applications

  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Power management

The 0451003.MRL from Littelfuse is a 3A 125VAC time-delay (slow-blow) ceramic fuse in 5x20mm package for overcurrent protection in power supplies and transformers.

The 0451003.MRL is a 3A 250VAC slow-blow (time-lag) ceramic fuse from Littelfuse in the standard 5x20mm cylindrical package. It is the 3A version of the 0451005.MRL (5A), sharing the same ceramic body construction and slow-blow time-current characteristic profile. The slow-blow characteristic allows short-duration inrush currents (typically 5-10x rated current for 10-100ms, such as transformer magnetizing inrush or capacitor charging) without nuisance blowing, while still providing overcurrent protection for sustained faults. The time-current characteristic: 3A (rated) = no blow; 4.5A (150%) = blows in >60 seconds; 6A (200%) = blows in 0.5-5 seconds; 15A (500%) = blows in 0.05-0.2 seconds. The ceramic body provides arc-quenching and mechanical integrity during fault interruption. The breaking capacity is 100A at 250VAC. The cold resistance is approximately 120mOhm (higher than the 5A version due to thinner fuse element), resulting in 1.08W dissipation at rated current. The 3A rating is commonly used for smaller power supplies, instrumentation, and control circuits where the steady-state current is 1.5-2.5A with occasional surges. The MRL suffix specifies IEC 60127-2 Sheet III time-lag characteristic.

Pin Name Type Function
1 Lead 1 Terminal Fuse terminal 1 (connects to source side)
2 Lead 2 Terminal Fuse terminal 2 (connects to load side)
  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Power management
    • Manufacturer Part Number Package Notes
    Littelfuse 0451003.MRL 5x20mm Same device, 3A rating
    Bel Fuse 5ST 3-R 5x20mm 3A 250VAC slow-blow, equivalent
    Schurter SPF 3.0A 5x20mm 3A 250VAC slow-blow, equivalent
    Bussmann S505-3A-R 5x20mm 3A 250VAC time-lag, equivalent
    Eaton BSM 3A 250V 5x20mm 3A 250VAC slow-blow, equivalent
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    Quality Assurance

    Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

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    Email: info@materialparts.com
    Tel / WhatsApp: +86 13760382860
    Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

     

    Shipping & Payment

    Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

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      US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

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      We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

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      All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.

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    5. Local Pickup in Shenzhen

    Local pickup service is available for customers in Shenzhen and surrounding areas:
    • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
    • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
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    Contact Information

    Email: info@materialparts.com

    Tel / WhatsApp: +86 13760382860

    Service & Packaging

    Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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    2. Genuine Product Guarantee & Full-process Quality Inspection

    All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

    3. Fast Quotation & Order Processing

    Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

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    6. Global Logistics & Document Services

    We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

    Professional Packaging Standards

    Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

    1. General Packaging Specifications

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    • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

    3. Custom Packaging Services

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    Contact Information

    For service consultation or packaging customization, please feel free to contact us:
    Email: info@materialparts.com
    Tel / WhatsApp: +86 13760382860
    Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
     

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