How 0ZCG0300FF2B from Bel Fuse Prevents Overcurrent Damage in Automotive Circuits - Keep Booming Electronic Components Distributor

The 0ZCG0300FF2B from Bel Fuse delivers reliable active overcurrent protection for automotive circuits, utilizing advanced PTC resettable fuse technology. The 0ZCG0300FF2B features a compact, surface-mount design that integrates seamlessly into modern automotive electronics. Engineers trust the 0ZCG0300FF2B to safeguard 6V systems—including infotainment, sensors, and lighting—by preventing damage and enhancing safety. The table below outlines the key specifications that demonstrate the dependability of the 0ZCG0300FF2B from Bel Fuse:

Parameter	Value
Hold Current (Ih)	2.6 A
Trip Current (It)	5 A
Time to Trip	5 seconds
Maximum Current	100 A
Certification	AEC-Q200, cURus, TUV

Key Takeaways

The 0ZCG0300FF2B fuse protects automotive circuits by quickly limiting excess current to prevent damage.
Its resettable design allows the fuse to cool and restore normal operation without needing replacement.
The compact surface-mount package saves space and fits easily into modern vehicle electronics.
Certified to meet strict automotive standards, it ensures reliable and safe performance in tough conditions.
This fuse supports key automotive systems like infotainment, sensors, lighting, and power distribution.

What is 0ZCG0300FF2B?

Overview

The 0ZCG0300FF2B ，Bel Fuse stands out as a compact, surface-mount resettable fuse designed for modern automotive electronics. This component protects circuits by limiting excessive current, which helps prevent damage to sensitive devices. Bel Fuse manufactures this part to meet strict automotive standards, making it suitable for demanding environments. The 0ZCG0300FF2B ，Bel Fuse fits into a small 1812 (4.55 mm x 3.24 mm) package, allowing engineers to save space on crowded circuit boards.

Note: The 0ZCG0300FF2B ，Bel Fuse meets AEC-Q200 standards, which ensures reliability in automotive applications.

The following table summarizes the main specifications:

Attribute	Specification
Manufacturer	Bel Fuse Inc.
Part Number	0ZCG0300FF2B
Type	Polymeric PTC Resettable Fuse
Maximum Voltage	6 V
Trip Current (It)	3 A
Operating Temperature	-40°C to 85°C
Package / Case	1812 (4532 Metric), Concave
Mounting Type	Surface Mount
Size / Dimension	0.179″ L x 0.128″ W (4.55mm x 3.24mm)
Time to Trip	5 seconds
Resistance – Initial	15 mΩ
Resistance – Post Trip	50 mΩ
Approval Agency	AEC-Q200, cURus, TUV
Environmental Compliance	RoHS3 Compliant, REACH Unaffected

PTC Resettable Fuse Technology

A PTC (Positive Temperature Coefficient) resettable fuse uses a special polymer material that changes resistance with temperature. When the current in a circuit rises above a safe level, the fuse heats up. The polymer expands, which increases resistance and limits the current flow. This action protects the circuit from overcurrent damage.

Once the fault clears and the fuse cools down, the polymer returns to its original state. The fuse resets itself and allows normal current to flow again. This resettable feature means engineers do not need to replace the fuse after each event.

The table below highlights the key features and functions:

Feature/Specification	Description
Product Type	PTC Resettable Fuse (Polymeric Positive Temperature Coefficient)
Holding Current	3 A
Trip Current	5 A
Maximum Voltage	6 VDC
Package Size	SMD 1812 (4.55 mm x 3.24 mm)
Standards Compliance	AEC-Q200 (Automotive Grade), cURus, TUV
Operating Temperature Range	-40°C to +85°C
Function	Provides overcurrent protection with resettable functionality after thermal overload
Applications	Automotive electronics, power supplies, battery packs, circuits needing resettable protection
Key Features	Resettable after trip, low initial resistance (~12 mΩ), suitable for automotive environments
Certifications	AEC-Q200 ensures reliability and quality for automotive use

Engineers choose the 0ZCG0300FF2B ，Bel Fuse for its ability to protect circuits, reset automatically, and meet automotive industry standards.

How 0ZCG0300FF2B Works

Overcurrent Detection

The 0ZCG0300FF2B ，Bel Fuse uses advanced PTC technology to detect overcurrent events in automotive circuits. When the current in a circuit rises above a safe level, the fuse responds quickly. The device monitors the flow of electricity and reacts when the current exceeds its trip threshold. This action protects sensitive automotive electronics from damage.

The following table shows the detection thresholds and key parameters:

Parameter	Value	Description
Hold Current	3A	Maximum current the fuse can carry without tripping
Trip Current	5A	Current threshold at which the fuse trips, indicating overcurrent
Operating Voltage	6VDC	Voltage range within which the fuse operates reliably
Resettable Function	Yes	Fuse resets after tripping once overload is cleared
Compliance	AEC-Q200	Automotive standard ensuring reliability and suitability

When the current stays below 3A, the fuse allows normal operation. If the current rises to 5A or more, the fuse trips. This trip action happens in about 4 seconds under rated conditions. The resistance of the fuse increases sharply, which limits the current flow and shields the circuit from harm.

The fuse holds current up to 3A before tripping.
The typical trip time at 5A is approximately 4 seconds.
After tripping, resistance increases to a maximum of 40 milliohms, restricting current flow.
The device operates safely within a maximum voltage of 6 VDC.

This quick response helps prevent overheating, short circuits, and potential fire hazards in automotive systems.

Reset and Recovery

After the overcurrent condition clears, the 0ZCG0300FF2B ，Bel Fuse begins its recovery process. The fuse cools down, and the polymer material inside returns to its original state. This change restores the fuse’s low resistance, allowing normal current to flow again.

The table below highlights the recovery characteristics:

Attribute	Value
Time to Trip	100 ms
Resistance – Initial (Ri) (Min)	300 mOhms
Resistance – Post Trip (R1) (Max)	1.2 Ohms
Current – Trip (It)	750 mA
Current – Hold (Ih) (Max)	350 mA

The fuse resets automatically without any manual intervention. This feature ensures that automotive circuits remain protected and operational, even after multiple overcurrent events. The device’s polymer construction supports reliable and repeatable operation, making it ideal for automotive environments.

Tip: The automatic reset function reduces maintenance needs and extends the lifespan of automotive electronics.

The 0ZCG0300FF2B ，Bel Fuse demonstrates a rapid return to normal operation. After tripping, the resistance drops back to its initial value once the device cools. This process allows the circuit to resume normal function quickly, minimizing downtime and ensuring continuous protection.

Key Features of 0ZCG0300FF2B from Bel Fuse

Compact Surface-Mount Design

The 0ZCG0300FF2B ，Bel Fuse features a compact surface-mount design that supports efficient use of space on printed circuit boards. Engineers can easily integrate this component into dense automotive electronics, thanks to its small SMD 1812 package. The device measures approximately 4.55 mm by 3.24 mm, making it suitable for modern, miniaturized systems.

Manufacturers benefit from several design and assembly advantages:

The compact size allows for space-efficient PCB layouts.
Tape and reel packaging supports automated assembly, which increases throughput and reduces manual labor.
Wraparound terminals improve soldering reliability, ensuring strong electrical connections.
The moisture sensitivity level of 2A (4 weeks) simplifies storage and handling.
Standardized case codes help streamline component selection and integration.
Dual-ended terminals and polymeric construction enable versatile mounting options.

These features help manufacturers achieve reliable, high-quality assembly while saving valuable board space. The table below highlights key performance metrics that set this device apart from other overcurrent protection solutions:

Performance Metric	0ZCG0300FF2B Value
Hold Current	3 A
Trip Current	5 A
Maximum Voltage	6 VDC
Initial Resistance	12 mΩ (low resistance)
Trip Time at 5A	4 seconds
Maximum Fault Current	100 A
Package Size	SMD 1812 (compact)
Operating Temperature	-40°C to +85°C
Standards Compliance	AEC-Q200, cURus, TUV certifications
Resettable Function	Yes (automatic reset after trip)

Tip: The compact surface-mount design not only saves space but also supports automated, reliable manufacturing processes.

AEC-Q200 Qualification

The 0ZCG0300FF2B ，Bel Fuse meets the rigorous AEC-Q200 standard, which is essential for automotive-grade components. This qualification confirms that the device has passed strict quality control and testing procedures. Approval agencies such as AEC-Q200, cURus, and TUV have certified this fuse for use in automotive and industrial environments.

Bel Fuse’s 0ZCG Series, including this model, is explicitly described as AEC-Q200 qualified. This status assures engineers that the fuse can withstand the demanding conditions found in automotive applications. The certification demonstrates the manufacturer’s commitment to reliability and safety. Automotive designers can trust this component to deliver consistent performance in critical systems.

Applications in Automotive Circuits

Infotainment and Sensors

Automotive infotainment systems require reliable circuit protection to ensure uninterrupted operation. The 0ZCG0300FF2B ，Bel Fuse helps protect audio units, navigation modules, and touchscreen displays from overcurrent events. Engineers often select this resettable fuse for its ability to automatically restore normal function after a fault. This feature reduces the need for manual maintenance and keeps entertainment and information systems running smoothly.

Sensors in vehicles monitor everything from tire pressure to cabin temperature. These sensors often operate on low-voltage rails and need consistent protection. The resettable fuse guards sensitive sensor circuits against short circuits and overloads. This protection helps maintain accurate readings and supports the safety features of modern vehicles.

Note: Reliable overcurrent protection in infotainment and sensor circuits helps prevent costly repairs and system downtime.

Lighting and Power Distribution

Modern vehicles use advanced lighting systems, including LED headlights, taillights, and interior illumination. These lighting circuits benefit from the fast-acting response of the resettable fuse. When a fault occurs, the fuse limits current flow and prevents damage to expensive lighting modules.

Power distribution units in vehicles manage the flow of electricity to various subsystems. The fuse provides a safeguard for these units, ensuring that a single fault does not disrupt the entire electrical system. This protection extends to USB hubs, battery packs, and embedded devices that operate under 6V. The fuse’s compact size allows engineers to integrate it into tight spaces within power management modules.

Application Area	Example Devices	Benefit of Resettable Fuse
Infotainment	Audio, navigation, displays	Maintains uptime, auto-reset
Sensors	Pressure, temperature, motion	Protects sensitive electronics
Lighting	LED headlights, interior	Prevents module damage
Power Distribution	USB hubs, battery packs	Isolates faults, saves space

Tip: Using resettable fuses in automotive circuits increases reliability and reduces maintenance costs.

Benefits for Automotive Electronics

Protection and Safety

Automotive circuits face many risks, including short circuits and overloads. The 0ZCG0300FF2B ，Bel Fuse helps protect sensitive electronics by acting quickly during overcurrent events. When a fault occurs, the fuse increases its resistance and limits the flow of electricity. This action prevents damage to important components like sensors, infotainment systems, and lighting modules.

The product holds several important safety and quality certifications. It meets the AEC-Q200 standard, which confirms its ability to perform in tough automotive environments. The cURus and TUV certifications show that the fuse has passed strict quality checks. RoHS3 compliance means the fuse also meets environmental safety standards. These certifications give engineers confidence that the fuse will protect circuits and meet industry requirements.

Note: Certified protection devices help reduce the risk of costly repairs and improve overall vehicle safety.

Reliability and Longevity

Automotive electronics must work reliably for many years. The 0ZCG0300FF2B fuse supports this goal by offering a resettable design. After an overcurrent event, the fuse cools down and returns to its normal state. This feature allows the circuit to resume operation without replacing the fuse. The automatic reset function reduces maintenance and keeps systems running smoothly.

The fuse’s robust construction and surface-mount design help it withstand vibration and temperature changes found in vehicles. Its consistent performance ensures that automotive systems stay protected over time. The table below highlights key benefits for long-term reliability:

Benefit	Description
Resettable Function	Allows repeated protection cycles
Certified Quality	Meets AEC-Q200, cURus, TUV, RoHS3 standards
Durable Construction	Handles harsh automotive conditions
Low Maintenance	Reduces need for manual fuse replacement

Reliable circuit protection extends the life of automotive electronics and supports safe, dependable vehicle operation.

The 0ZCG0300FF2B ，Bel Fuse delivers dependable, resettable overcurrent protection for automotive circuits. Its compact SMD 1812 package, AEC-Q200 qualification, and automatic reset feature help safeguard sensitive electronics in modern vehicles. The table below highlights its proven performance and quality:

Feature/Aspect	Details
Product Type	Polymeric PTC resettable fuse
Automotive Standard	AEC-Q200 qualified
Hold Current	3A (typical)
Trip Current	5A at 6VDC
Certifications	AEC-Q200, cURus, TUV
Key Features	Resettable, low resistance, auto reset

Engineers seeking robust, compact circuit protection for automotive systems can rely on this solution.

What makes the 0ZCG0300FF2B suitable for automotive circuits?

The 0ZCG0300FF2B meets AEC-Q200 standards. Its compact surface-mount design fits tight spaces. The fuse resets automatically after an overcurrent event. Engineers use it to protect sensitive electronics in 6V automotive systems.

How does the resettable function work?

The fuse increases resistance when it detects too much current. This action limits the flow and protects the circuit. After the fault clears, the fuse cools and returns to normal operation. No replacement is needed.

Can the 0ZCG0300FF2B protect USB hubs and battery packs?

Yes. The fuse works well in USB hubs, battery packs, and other low-voltage devices under 6V. It prevents damage from short circuits and overloads, making it ideal for many automotive and industrial applications.

What certifications does the 0ZCG0300FF2B have?

Certification	Description
AEC-Q200	Automotive-grade quality
cURus	North American safety
TUV	International safety
RoHS3	Environmental compliance

These certifications show the fuse meets strict industry standards.

Why choose a PTC resettable fuse over a traditional fuse?

A PTC resettable fuse, like the 0ZCG0300FF2B, resets itself after an overcurrent event. Traditional fuses need replacement. This feature saves time, reduces maintenance, and keeps automotive systems running longer.