When you press a button to start a machine, trigger a control function, or operate equipment, you may want the device to stop immediately once you release your hand. In this situation, a momentary push button switch is the ideal solution.
A momentary push button switch only remains active while the button is being pressed. Once the operator releases the button, the switch automatically returns to its original position and disconnects the circuit (returning to its normal electrical state). These switches are widely used in industrial equipment, control panels, power tools, and any application that requires temporary control.
If you are wondering “Which switch turns off when released?”, the answer is usually a momentary push button switch, especially a normally open (NO) type momentary switch.
What Is a Momentary Push Button Switch?
A momentary push button switch is a type of control switch that only activates while external pressure is applied. Unlike a latching push button switch, which stays in its switched position after being pressed, a momentary switch automatically returns to its original state when the pressing force is removed.
The working process is simple:
Press the button → Circuit is connected and activated
Release the button → Circuit returns to its original state
This simple operating principle makes momentary switches ideal for applications that require short-term control without continuous operation
Common applications include:
- Machine start buttons
- Doorbell buttons
- Power tool trigger switches
- Industrial control panels
- Reset buttons
- Testing switches
- Safety control systems
Which Type of Switch Turns Off When Released?
The most common switch that turns off after release is a normally open momentary push button switch (NO).
In its normal state, the contacts remain open and the circuit is disconnected. When the button is pressed, the contacts close and allow current to flow. Once the button is released, the contacts automatically open again.
Operating sequence:
Button released → Circuit disconnected
Button pressed → Circuit connected
Button released again → Circuit returns to open state
This type of switch is especially suitable for equipment that should only operate while the operator is actively pressing the button, providing both convenience and safety.
Momentary Push Button Switch vs Latching Push Button Switch
Many buyers confuse these two types of buttons because they may have similar appearances, but their operating methods are completely different.
| Comparison | Momentary Push Button Switch | Latching Push Button Switch |
| Working method | Works only while pressed | Maintains the switched position after pressing |
| After release | Automatically resets | Keeps the ON/OFF status |
| Operator action | Requires continuous pressing | One press changes the state |
| Typical applications | Start buttons, reset controls, temporary signals | Equipment power ON/OFF control |
For example, a machine start button usually uses a momentary push button switch because the operator only needs to send a temporary control signal. However, a main power switch often uses a latching switch because the equipment needs to remain powered after activation.
Related Article Links：Push Button Switches: Working Principles and Differences between Latching & Momentary
ONPOW Momentary Push Button Switches
For industrial projects requiring reliable and durable control components, ONPOW provides a complete range of momentary push button switches designed for various equipment requirements.
ONPOW momentary switches are available with multiple mounting sizes, contact configurations, LED illuminated options, and protection ratings to meet different industrial control applications. With years of manufacturing experience and comprehensive quality certifications, ONPOW provides suitable push button solutions for automation equipment, control cabinets, and electrical systems
Featured ONPOW Momentary Push Button Switch Series
GQ16 Series:
Short-body design with more flexible wiring space behind the panel, offering excellent vibration resistance, water and dust protection, and vandal resistance.
LCA Series:
Detachable design for easier switch maintenance and supporting a 20A heating current.
ONPOW61 Series:
Features a three-color LED structure and supports stepless color changing.
