3-Position Slide Switch, 30 V DC 0.5 A

Description

3-Position Slide Switch, 30 V DC, 0.5 A

This compact slide switch has three stable positions. It can select among modes, signals or circuit configurations. The slider stays in the selected position. It is a through-hole PCB component with manual slider operation.

Features

• Three stable positions
• Compact format
• For low-voltage circuits
• Announced service life: 10,000 cycles

Technical specifications stated in the source listing

• Maximum rated voltage: 30 V DC
• Maximum rated current: 0.5 A
• Contact resistance: ≤ 0.03 Ω
• Insulation resistance: ≥ 500 MΩ
• Insulation test voltage: 500 V AC for 1 minute
• Approximate service life: 10,000 cycles
• Mounting: through-hole PCB

The 500 V AC value is a short-duration insulation test, not the switch’s normal operating voltage. The source-listed maximum operating rating is 30 V DC, 0.5 A.

How it works

The slider moves an internal metal contact. Depending on its position, it connects the common terminal to another terminal or establishes a different contact combination. The exact connection diagram depends on the pinout of this version.

Identify the pinout

1. Set a multimeter to continuity mode before soldering the switch.
2. Place the slider in the first position.
3. Test combinations of pins and note which ones are electrically connected.
4. Move the slider to the middle position and repeat the measurement.
5. Repeat for the third position.
6. Identify the common terminal or terminals.
7. Draw a connection table before wiring the circuit.

This procedure helps avoid wiring errors when the pinout is not printed on the component.

Example: selecting among three signals

1. Identify the common terminal with a multimeter.
2. Connect it to the circuit input you want to control.
3. Connect the selected contacts to the different signals or functions.
4. Keep the voltage below 30 V DC and current at or below 0.5 A.
5. Test each position before final soldering.
6. Insulate exposed connections properly.

For loads above 0.5 A, use the switch only as a control signal for a suitably rated relay, transistor or MOSFET.

Example: selecting a level

Position 1 → Resistor R1 → Low level
Position 2 → Resistor R2 → Medium level
Position 3 → Resistor R3 → High level

With a suitable electronic circuit, this arrangement can select a speed, brightness, audio gain or reference value.

Safety precautions

• Stay within the source-listed limit of 30 V DC and 0.5 A.
• Do not connect this switch directly to 220–230 V mains.
• Disconnect power before changing wiring.
• Check the pinout with a multimeter before soldering.
• Do not directly switch a motor or a significant inductive load.
• Use suitable protection for relays, coils and small motors.
• Avoid heating the pins for too long while soldering.
• Do not force the slider beyond its three positions.

Typical applications

• Selecting one of three modes
• Audio circuits and input selection
• Lighting-level selection
• Speed control with a suitable circuit
• Arduino and robotics interfaces
• Battery-powered devices
• Electronic toys and controllers
• Prototypes and DIY circuits
• Small control panels
• Electronics training exercises

Keywords: slide switch, 3-position switch.