Introduction
Welcome to the Braun Series 3 BT3520 Beard Trimmer user manual. This guide provides comprehensive instructions for the safe and effective use of your new beard trimmer. Designed for effortless styling, the Braun Series 3 BT3520 features ultra-sharp blades and a precision dial with 40 length settings, ensuring precise trimming and ultimate control for various beard styles.
Important Safety Information
Please read all instructions carefully before using the appliance.
- Water Safety: Keep the appliance away from water. Do not use it near bathtubs, showers, basins, or other vessels containing water.
- Children: This appliance is not intended for use by children or persons with reduced physical, sensory, or mental capabilities, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Do not use on infants or children.
- Eye and Nose Area: Exercise caution when trimming near the eyes and nose to prevent injury.
- Power Cord: Only use the power cord supplied with the appliance. Do not use if the cord is damaged.
- Maintenance: Do not attempt to repair the appliance yourself. Contact authorized service personnel for repairs.
Package Contents
Your Braun Series 3 BT3520 package includes the following items:
- 1x Braun Series 3 BT3520 Beard Trimmer
- 2x Precision Combs (0.5-10mm and 10.5-20mm)
- 1x Cleaning Brush
- 1x Charger

Image: The Braun Series 3 BT3520 Beard Trimmer shown with its included accessories: the trimmer unit, two precision comb attachments, and a cleaning brush.
Setup and Charging
Initial Charge
- Before first use, fully charge the trimmer for approximately 8 hours.
- Connect the charger to the trimmer and plug it into an electrical outlet.
- The charging indicator light will show the charging status.
Attaching Combs
Select the desired precision comb (0.5-10mm or 10.5-20mm) based on your preferred beard length.
- Align the comb with the trimmer head.
- Gently push the comb onto the trimmer head until it clicks into place.
- To remove, gently pull the comb away from the trimmer head.

Image: A detailed view of the trimmer's precision wheel for length adjustment, the ultra-sharp blade, and the two different sized comb attachments.
Operating Instructions
Adjusting Length Settings
The Braun Series 3 BT3520 features a precision dial with 40 length settings in 0.5 mm increments.
- Ensure a comb attachment is securely in place.
- Rotate the precision wheel to select your desired trimming length. The selected length will be indicated on the dial.
Trimming Your Beard
- Turn on the trimmer by pressing the power button.
- Hold the trimmer with the comb flat against your skin.
- Move the trimmer against the direction of hair growth, using slow and even strokes.
- For outlining and shaping, remove the comb attachment and use the bare blade carefully.
- After use, turn off the trimmer.

Image: A man demonstrating how to use the Braun Series 3 BT3520 beard trimmer for precise beard grooming.
Maintenance and Cleaning
Cleaning the Trimmer
- Ensure the trimmer is switched off and disconnected from the power supply.
- Remove the comb attachment.
- Use the provided cleaning brush to remove hair clippings from the trimmer head and comb.
- The trimmer head and combs can be rinsed under running water. Ensure they are completely dry before reattaching or storing.
- Do not immerse the entire trimmer unit in water unless specified as fully waterproof (check product specifications for details).
Blade Care
For optimal performance, regularly oil the blades with light machine oil (not included) after cleaning, especially if rinsing with water.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Trimmer does not turn on. | Battery is discharged. | Charge the trimmer for at least 50 minutes for a quick trim, or fully for 8 hours. |
| Trimmer pulls hair or cuts unevenly. | Blades are dull or clogged with hair. | Clean the trimmer head and blades thoroughly. Consider oiling the blades. If problem persists, blades may need replacement (contact support). |
| Comb attachment falls off. | Comb not securely attached. | Ensure the comb clicks firmly into place. Inspect for damage to the comb or trimmer head. |
Specifications
- Model: BT3520
- Brand: Braun
- Power Source: Battery powered
- Battery Life: Up to 50 minutes cordless trimming
- Length Settings: 40 precision length settings (0.5mm increments)
- Blade Material: Stainless Steel
- Dimensions (L x W x H): 10.5 x 6 x 25.2 cm
- Weight: 113 Grams
- Country of Origin: China
- Manufacturer: Procter & Gamble
Warranty and Support
For warranty information, product registration, or further support, please refer to the official Braun website or contact their customer service.
You can also scan the QR code below for essential tips and additional information:






