#tharun electronics

4 Inch Fan 12038 – Complete Guide

When it comes to efficient cooling solutions for electronics, machinery, and enclosures, the 4 Inch Fan 12038 is one of the most popular choices. Known for its compact design, reliable performance, and versatile applications, this cooling fan ensures steady airflow where space is limited but effective cooling is essential.

What is a 4 Inch Fan 12038?

The term 12038 refers to the fan’s dimensions:

120 mm x 120 mm (4.7 inches x 4.7 inches) in length and width

38 mm thickness

This makes it slightly thicker than standard 12025 fans (25 mm thick), allowing for higher static pressure and stronger airflow.

Key Features

High Airflow: Designed to move a large volume of air, keeping components cool.

Durable Build: Usually made with ball bearings or sleeve bearings for long life.

Voltage Options: Available in AC (110V/220V) and DC (12V/24V/48V) versions.

Low Noise: Many models are optimized for quiet operation.

Compact Size: Fits into tight spaces without compromising cooling efficiency.

Applications

The 4 Inch 12038 fan is widely used in:

Electronics Cooling: Power supplies, control boards, inverters, and amplifiers.

Industrial Machines: CNC machines, welding equipment, 3D printers.

Enclosures & Cabinets: Electrical panels, server racks, and automation systems.

Home Appliances: Air purifiers, projectors, and cooling boxes.

Choosing the Right 12038 Fan

When selecting a 4 Inch Fan 12038, consider:

Power Type – AC or DC, based on your system.

Airflow (CFM) – Higher airflow = better cooling.

Noise Level (dBA) – Important for quiet environments.

Bearing Type – Ball bearings last longer, sleeve bearings are cheaper.

Durability – Check for dustproof and waterproof ratings (IP ratings).

Advantages

Compact yet powerful cooling solution

Long operational life

Easy installation with standard mounting holes

Wide availability in different voltages and speeds

Conclusion

Bridge Rectifier Component – S35VB100

Introduction The S35VB100 is a reliable and high-performance single-phase bridge rectifier designed for converting alternating current (AC) to direct current (DC). Known for its strong current-handling capacity and high reverse voltage tolerance, it is widely used in power supply circuits, industrial equipment, and electronic systems that demand stable DC output.

Key Features Maximum Repetitive Peak Reverse Voltage (VRRM): 1000V Average Forward Current (IF): 35A Peak Surge Current (IFSM): 500A Configuration: Single-phase full bridge Package Type: Compact square case with easy mounting Technology: Glass-passivated junction for durability and stability Working Principle The S35VB100 contains four diodes arranged in a bridge configuration. When AC voltage is applied: During the positive half cycle, two diodes conduct and allow current flow in one direction. During the negative half cycle, the other two diodes conduct, maintaining the same current direction through the load. This results in a pulsating DC output, which can be smoothed using capacitors or filters to achieve a more stable DC voltage.

Applications

The S35VB100 bridge rectifier is suitable for: Power supply units and converters Battery chargers and UPS systems Motor control circuits Welding machines and industrial controllers Home appliances and automation systems Design Considerations To ensure optimal performance, follow these design tips: Provide adequate cooling – Use a heat sink or proper ventilation to manage the heat generated during operation. Derate current – Operate below maximum ratings for longer device life and reliability. Use filter capacitors – Smooth out the ripple in DC output for stable performance. Prevent surge damage – Include inrush current limiters or fuses to handle power spikes safely. Ensure correct wiring – Verify AC and DC terminal polarity before powering up.

In this post, we’ll dive into the Arc 200 MOSFET Power Board configuration, focusing on its features, the significance of the 32D431K varistor, and key tips for troubleshooting and replacement.

If you're working with inverter welding machines, you've likely come across the ARC 200 model — a popular choice for light to medium-duty welding tasks. One of the most crucial components of this welder is its MOSFET Power Board, which plays a central role in power conversion and switching.

🔧 What is the ARC 200 MOSFET Power Board?

The MOSFET Power Board in the ARC 200 is essentially the heart of the inverter welding machine. It handles:

High-speed switching of DC current

Voltage and current regulation

Protection from over-voltage and over-current

Thermal and short circuit management

This board is designed to manage high input voltages and deliver a stable, controlled output for the welding arc.

🔎 How to Check 32D431K:

Visual inspection: Look for cracks, burns, or swelling

Continuity test: A shorted MOV will show low resistance

In-circuit testing: Monitor clamp voltage with an oscilloscope (advanced users)

🔁 Replacing the 32D431K and Power Board Maintenance

If you need to replace the 32D431K:

Discharge capacitors before touching the board

Use a high-wattage soldering iron to remove the old MOV

Replace with an exact model (32D431K or equivalent)

Check nearby components for collateral damage

Apply fresh thermal paste on MOSFETs if removed

Power up with a series bulb tester to avoid full current at first run

🧰 Pro Tips:

Always check for shorted MOSFETs when replacing the MOV

Use original rated components for safety and performance