A two way push button is a compact and versatile control device used in industrial machinery, automation systems, and electrical panels. It allows operators to control two functions—such as Forward/Reverse, Up/Down, or Start/Stop—from a single switch.
Correct wiring is essential to ensure safe, reliable, and efficient operation. Whether you’re an electrician, technician, or a beginner learning industrial controls, this step-by-step guide will help you wire a two way push button the right way.
What Is a Two Way Push Button?A two way push button integrates two separate operations in one unit. It typically includes:
Two terminals or contact blocks (often NO/NC combinations)
A momentary or latching actuator
A shared mounting base
Common uses include motor control, conveyors, hoists, and various automation systems.
Understanding the internal contact types is key before wiring:
NO (Normally Open) — Circuit closes when the button is pressed
NC (Normally Closed) — Circuit opens when the button is pressed
Two way push buttons may use either one or a combination of both.
Before you start wiring, prepare:
Two way push button switch
Electrical wires (appropriate gauge)
Screwdriver set
Control relay or contactor (if used for motor direction control)
Wire markers or labels
Multimeter (optional, for testing)
Most two way push buttons include:
Left side contacts (Function A)
Right side contacts (Function B)
Markings such as NO, NC, COM, or numbers
Check the wiring diagram provided by the manufacturer. This ensures you connect to the correct terminals.
Cut wires to required lengths and strip the ends.
Use different colors for clarity, such as:
Red for power
Black for common
Blue/Green for control output
Proper labeling helps during future maintenance.
Most two way push buttons share a COM (common) terminal for each side.
Connect your input power or control voltage (e.g., 24VDC or 220VAC) to the COM terminal on each function block.
Tighten terminal screws securely.
Depending on your application:
For Forward/Reverse Control
Connect NO (Function A) to the forward relay coil
Connect NO (Function B) to the reverse relay coil
Ensure interlock wiring exists to prevent both coils from energizing simultaneously
For Start/Stop Applications
STOP is usually NC
START is NO
For Up/Down or Open/Close
Output A → “Up/Open” device
Output B → “Down/Close” device
Always match terminal type (NO or NC) to your control logic.
Before powering the system:
Double-check all connections
Make sure screws are tightened
Ensure wires are not loose
Confirm no output wires are touching each other
Optional:
Use a multimeter to confirm continuity when pressing each direction.
Turn on the main power supply and test the button:
Press the left side → The intended function (A) should activate
Press the right side → The opposite function (B) should activate
Release → The button should return to neutral (for momentary types)
If any function behaves incorrectly, turn power off and re-check wiring.
Always disconnect power before wiring
Follow voltage/current ratings
Use proper interlocks when controlling motors
Keep wires organized and labeled
Use insulated tools for extra safety
Follow local electrical codes and standards
Wiring a two way push button is straightforward once you understand its contacts and intended functions. By following this step-by-step guide, you can install the switch safely and correctly for applications such as motor direction control, automation systems, and equipment operation.
Proper wiring not only improves system reliability but also enhances operator safety and long-term equipment performance.
Yes, in most cases.
Two way push buttons do not directly switch high-power loads. For motor direction control (Forward/Reverse) or heavy machinery, you must use relays or contactors to protect the system and ensure safe operation.
Yes.
Two way push buttons often share a common input power (COM) for both functions. Just ensure the current and voltage match the rating of the switch and control device.
Absolutely.
Forward and reverse relays must be electrically and mechanically interlocked to prevent both directions from energizing at the same time, which can damage the motor.
