◆  Optional with the function as follows:

→  Full-wave speed control

→  Half-wave speed control

→  On-Off version

→  On-Off with Passive linear potentiometer

→  Speed limited in forward or reverse

◆  Optional with Following lock types:

→  No Lock

→  Lock-on

◆  Optional with the accessor as follows:

→  Knob for adjusting start voltage

→  Dial wheel of Trigger

→  Rubberized Trigger (overmolding)

→  Triac or SCR connected to PCB externally, optional with heat-sink

◆ The electronics in the switches had to be tested together with the corresponding appliances, so the switches are suitable for appliance of class II.

◆  Input side:

→  Pillar teminal Φ=3mm

◆  Output side and Eeversing box side:

→   Push-in terminals for soldered strands, strands with end sleeves or strands with end claws

Power Tool Switch AT Series AT02: Advanced Trigger Switch for Multi-Speed Control

1. Product Introduction

The AT02 Series power tool switch is a general-purpose, multi-speed trigger switch designed for a wide array of handheld power tools. This series integrates dustproof construction and features a by-pass contact design, enabling efficient power delivery and reliable switching for variable-speed applications. Built to accommodate both professional-grade and consumer-level tools, the AT02 series stands out for its customizability, compact form factor, and safety compliance.

Target applications include 6mm and 10mm electric drills, impact drills, impact screwdrivers, rotary hammers, jig saws, electric mixers, orbital sanders, and foot switches for hanging carving machines.

2. Key Features

• Multi-Speed Functionality:

• Full-wave speed control for smooth power delivery.

• Half-wave speed control for more economical tool designs.

• Basic on-off switching for simple operations.

• On-off with integrated passive linear potentiometer for smoother ramp-up and ramp-down performance.

• Forward and reverse directional speed limiting for added control and safety.

• Locking Mechanisms:

• No-lock version for maximum control and safety.

• Lock-on version to reduce user fatigue during long periods of operation.

• Accessory Compatibility:

• Adjustable start-voltage knob for precise control over activation sensitivity.

• Dial wheel for easy speed pre-selection.

• Rubberized (overmolded) trigger for better grip and ergonomic comfort.

• External Triac or SCR connection for higher current demands, with optional heat-sink.

• Dustproof Construction:

• Built with durable materials and a sealed design to prevent dust ingress, ensuring long-term stability and reliability in harsh workshop or jobsite environments.

• Class II Appliance Compatibility:

• The AT02 series is designed for Class II double-insulated tools. All electronics are tested with the host appliances for seamless certification.

3. Technical Specifications

4. Application Scenarios

a) Electric Drills (6mm and 10mm)

Compact and mid-sized electric drills benefit from the AT02's adjustable speed controls. The by-pass contact enables maximum torque when needed, while half-wave control allows for cost-effective speed modulation.

b) Impact Drills and Impact Screwdrivers

These high-torque tools often require speed-limiting features to protect users and materials. The lock-on option provides comfort during repetitive or high-resistance drilling tasks.

c) Rotary Hammers

Combining directional control and dust protection, the AT02 is ideal for rotary hammers used in masonry or heavy-duty applications.

d) Jig Saws and Electric Mixers

Saws benefit from dial-based speed tuning for clean cuts, while mixers take advantage of the trigger's smooth potentiometer-driven acceleration.

e) Orbital Sanders

Operators can control abrasion intensity using full- or half-wave modes, with overmolded triggers providing enhanced comfort during prolonged use.

f) Foot Switches for Hanging Carving Machines

The AT02's flexibility makes it a top choice for non-handheld applications like foot switches, where hands-free speed modulation is essential.

5. Common Questions (FAQ)

Q1: Can I switch between speed control modes within the same unit?
No, each AT02 unit is configured during manufacturing to support a specific control mode (full-wave, half-wave, etc.). Choose the right version based on your application's requirements.

Q2: How does the by-pass contact work?
When the trigger reaches its maximum travel, the by-pass contact engages, allowing full current from the power source to flow directly to the motor. This maximizes output performance.

Q3: Can I add the external Triac/SCR setup myself?
The Triac or SCR integration must be done at the design stage by engineers. Heat-sink sizing and PCB layout must be matched to tool voltage and load current.

Q4: Is IP40 protection enough for jobsite use?
IP40 is sufficient for most indoor and dry workshop environments. For extreme conditions (dust clouds, outdoor use), additional external protection is recommended.

Q5: Is the AT02 compatible with both brushed and brushless motors?
The AT02 is primarily designed for brushed motors. For brushless DC motors, other series like DT may be more suitable depending on your control architecture.

6. Integration Advice

• Choose the correct speed control logic for your tool class and target audience.

• If user comfort is critical, include the rubberized trigger and dial wheel accessories.

• Lock-on switches are ideal for pro-grade tools used in long, continuous tasks.

• Ensure electronic compatibility by testing the switch with your motor driver and safety system.

• Use external Triac/SCR only when high current levels demand better thermal handling.

• Plan cable routing and connection terminals based on φ3 mm pillar and push-in layout.

7. Conclusion

The AT02 Series is a reliable, adaptable trigger switch platform tailored for high-performance power tools. Its robust construction, versatile configuration options, and application-tested compatibility make it a top choice for manufacturers designing drills, sanders, jigsaws, mixers, and more. With customization available from speed control type to lock mechanism and accessories, the AT02 balances cost, quality, and functionality to meet a wide variety of industrial and consumer demands.

Whether your goal is comfort, control, or safety, the AT02 delivers in full.