What Is the Difference Between Momentary and Latching Control?
PA control boxes support two switch modes. Understanding the difference helps you choose the right option for your application's safety and usability requirements.
Comparison
| Feature | Momentary | Latching (Non-Momentary) |
|---|---|---|
| Motor runs when… | Button is held | Button pressed once to start, once to stop |
| Releases when… | Button released | Next button press or end of stroke |
| Best for… | Applications needing operator presence (safety) | Hands-free or automated positioning |
| Example | Medical/industrial where uncontrolled motion is hazardous | Stage lifts, furniture, solar trackers |
| PA Control Boxes | PA-20, PA-22, PA-24 (configurable) | PA-20, PA-22, PA-24 (configurable) |
Switching Modes on PA Control Boxes
On the PA-20, PA-22, and PA-24, the default mode is latching. To switch to momentary mode:
1. Locate the DIP switch block
Open the control box cover (or access the rear panel). Find the small DIP switch bank, typically 4 switches labelled SW1–SW4.
2. Toggle SW1 to ON
Moving SW1 to the ON position selects momentary mode. Toggle SW1 to OFF for latching mode. Refer to the datasheet for your specific control box as switch assignments vary by model.
3. Test the new mode
Press and release the button quickly. In momentary mode, the actuator should stop immediately on release. In latching mode, it should continue to the end of stroke.
Not sure which mode to use? If the application involves any risk of pinching, crushing, or unexpected movement (medical, automotive, industrial), use momentary so the operator must maintain intentional contact with the control.