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0685T4000-01

4A 63V slow blow SMD chip fuse, 1206 ceramic, AEC-Q200, 50A breaking, Bel Fuse C1T

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Manufacturer Part：

0685T4000-01

Package：

1206 (3216 Metric) (3.20 x 1.58 x 0.63 mm)

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Description

Product Overview

The 0685T4000-01 is a 4A, 63V surface mount slow blow chip fuse from Bel Fuse Inc.’s C1T series. Housed in a 1206 (3216 metric) ceramic package, this fuse provides overcurrent protection with a time-delay (slow blow) characteristic that tolerates inrush currents while protecting against sustained overloads. The -01 suffix indicates tape and reel packaging with 5000 pieces per 7-inch reel. The device is AEC-Q200 qualified, making it suitable for automotive and industrial applications.

Key Specifications

Current Rating 4 A
Voltage Rating 63 VAC / 63 VDC
Breaking Capacity 50 A @ 63VAC/DC
Fuse Characteristic Slow Blow (Time-Lag)
Nominal Cold Resistance 0.030 Ω
Maximum Voltage Drop @ 100% In 0.195 V
Nominal Melting I²t @ 10x In 2.56 A²s
Maximum Power Dissipation @ 100% In 0.78 W
Marking Code T4
Package 1206 (3.20 x 1.58 x 0.63 mm)
Operating Temperature -55°C to +125°C
Agency Approvals AEC-Q200, cURus, CE, TUV
Packaging Tape & Reel, 5000 pcs/reel (-01)

Features

  • Slow blow (time-lag) characteristic tolerates inrush currents from capacitive and inductive loads
  • AEC-Q200 automotive qualified for harsh environment applications
  • Ceramic 1206 surface mount package for automated PCB assembly
  • Low 30mΩ cold resistance minimizes voltage drop and power loss
  • 50A breaking capacity at rated voltage for safe fault interruption
  • Multiple agency approvals (cURus, CE, TUV) for global compliance
  • Rated for 4 hours minimum continuous operation at rated current

Applications

  • Automotive electronics power line protection
  • Industrial equipment overcurrent protection
  • Power supply input and output fuse protection
  • LCD monitor and medical equipment circuit protection
  • Notebook and office equipment DC bus fusing

The Bel Fuse 0685T4000-01 is a 4A rated slow blow (time-lag) surface mount chip fuse from the C1T series, designed for overcurrent protection in automotive, industrial, and consumer electronics applications. The C1T series uses a ceramic body construction that provides stable performance and reliable arc suppression during fault interruption. The slow blow characteristic allows the fuse to withstand short-duration inrush currents — such as those from capacitive input filters and motor startup — without nuisance tripping, while still protecting against sustained overloads. With a 63V AC/DC voltage rating and 50A breaking capacity, the fuse safely interrupts fault currents up to 50A. The 30mΩ cold resistance and 0.78W maximum power dissipation minimize voltage drop and self-heating during normal operation. The AEC-Q200 qualification ensures reliability under automotive thermal cycling and vibration conditions.

The 0685T4000-01 slow blow fuse uses a fusible element with a designed thermal mass that requires sustained overcurrent to melt. Unlike fast-acting fuses that open quickly at modest overloads, the slow blow element absorbs the I²t energy of transient inrush currents without opening. The fuse element is a specially shaped metal alloy (typically a low-melting-point alloy with a constriction or weak link) inside the ceramic 1206 body. During normal operation at or below the 4A rated current, the element stays below its melting temperature indefinitely (rated for minimum 4 hours at 100% In). When a sustained overcurrent exceeds the fuse’s time-current characteristic curve, the element heats to its melting point and opens the circuit. The ceramic body contains the arc that forms during interruption and channels it through the breaking capacity rating. The nominal melting I²t of 2.56 A²s at 10x rated current defines the thermal energy threshold for fuse opening.

Terminal Name Type Function
1 Terminal 1 Connection Fuse element terminal, solder pad 1
2 Terminal 2 Connection Fuse element terminal, solder pad 2
  • Automotive ECU and infotainment power rail overcurrent protection
  • Industrial power supply DC output fuse protection
  • Medical equipment and LCD monitor circuit protection
  • Notebook adapter and charger output fusing
  • Office electronics and distributed power bus fusing
Manufacturer Part Number Package Notes
Bel Fuse 0685T3000-01 1206 3A variant, same C1T series
Bel Fuse 0685T5000-01 1206 5A variant, same C1T series
Littelfuse 0435004.WR 1206 4A slow blow 63V, similar spec
Bourns MF-PSMF024-2 1206 2A slow blow, alternative rating
Schurter USF 1206-4A 1206 4A slow blow chip fuse
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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.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

Contact Us

If you have inquiries about our quality standards, inspection procedures or product certification documents, 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

 

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.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
  1. Accepted Payment Methods
  • T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
  • PayPal: Ideal for small orders, sample orders and quick payments.

  1. Settlement Currency

     

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

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

  3. Payment Requirements
  • Sample and small orders: Shipment will be arranged upon full payment.
  • In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.

2. Shipping & Delivery

We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
  1. Logistics Partners
  • International Express: DHL, FedEx, UPS, TNT
  • Economy Logistics: Air freight and sea freight for large-volume cargo
  • Domestic Delivery: SF Express, Yunda Express
  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
  1. Shipping Fee Rules
  • Shipping cost is calculated based on package weight, volume, destination and delivery method.
  • Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
  1. Shipment Tracking
     

    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

3. General Order Rules & Notes

  1. MOQ & Sample Service

     

    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.

  2. Packaging Standard

     

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

4. Customs & Liability Statement

  1. Import Duties & Taxes

     

    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

  2. Handling of Lost or Damaged Goods
  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

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.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

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.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

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.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

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

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

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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