Momentary Push Button Switch

A momentary push button switch is a type of switch which is only activated while it is being pressed. As soon as the button is released the electrical circuit returns to its original state.  The actuator is spring loaded so returns to its original position when the force is removed.  The buttons on your keyboard are typical examples of momentary push button switches.

Momentary push button switch circuit diagrams
On a circuit diagram, a momentary push switch is represented with small triangles as shown below:

Normally Open verses Normally Closed switches

A push-to-make or normally open switch is the most common type of switch. This means that an electrical circuit is connected when the switch is pressed.  When the button is released, the circuit is broken and the machine or process is turned off.

A push-to-break or normally closed switch works in the opposite way. When the actuator is pressed the circuit is deactivated and when released the circuit returns to its live state.  A normally closed momentary push switch is used in many fridge door applications.  When the fridge door is closed the switch is pressed, breaking the circuit.  When the door opens the button is released and the circuit is activated allowing the internal light to come on.

Our momentary push button switches
Alan Butcher Components has a wide range of momentary pushbutton switches. The majority are panel mount, so easy to fit using the recommended panel cut-outs.  We also supply through hole and surface mount tactile switches which fit on to PCB boards.

Outlined below is an overview of our key momentary push button switch series:

SP momentary push button circuit diagramThis shows a single pole, (on)-off push button switch. When written, the momentary action is depicted by the use of brackets.
DP momentary push button circuit diagramThis diagram illustrates a double pole (on)-off momentary push switch. The term “Pole” refers to the number of circuits a switch is able to operate.
16mm Square Push Button Switch - D16LMS1-1ABD16LM series – The D16 series is manufactured by Deca SwitchLab, based in Taiwan. They are 16mm, modular, illuminated momentary push button switches.  The customer can select for example the number of connections, lamp voltage, lens design and colour.  The lens shape can be round, square or rectangular.
16mm momentary push button switch - P12731128000P1 series – manufactured by Everel Italy under the Molveo brand, the P1 series is a small 16mm push button switch available in SP or DP. It can be fitted with a splash proof cap for IP65 protection.  Connection is via 2.8mm solder terminals and the switch can be illuminated momentary or non-illuminated.  We show a couple of options on our website and the full range can be viewed by downloading the data sheet from the Everel website –
Red momentary push switch - SP6014C1R0000SP60 series – the momentary push button switches within this series are versatile and robust. They are used within a variety of applications including steam cleaners, security and alarms, load monitoring equipment, dryers and washroom products.  Indeed, the SP6014C100000 is one of our most popular switches.  Coloured caps are available to snap fit on to the switch button –  They can also be fitted with the SP60PRT1 splash proof cap to offer IP65 protection –
Illuminated 240V Push Button Switch - SXL4126H1E0000WSXL41 – This Signalux switch is also manufactured by Everel.   It is a rectangular switch with 13mmx19mm cutout.  The momentary version is available SP and DP.  Supplied with 4.8mm faston terminals, these switches are 16A/250VAC rated.  The SXL44 series is IP65 rated.  Please click on the following link to the Everel website where you can download the product data –
Push Pull Door Switch - HY69-2HY69 – The Kedu HY69 door override switch is widely used within gaming and vending machine applications. The switch enables a maintenance engineer to work on the internal panels of a machine, with the machine on or off.

Anti-Vandal Push Button Switch - AB-AV-1602
AB-AV Series – We offer a wide range of IP65 momentary push button switches. They come in various cutouts – 12mm, 16mm, 19mm and can be found on our Anti-vandal switch page – of the switches are illuminated momentary push button switches. They are available with ring or dot illumination, 12V or 24V LED in a variety of colours – green, red, blue, orange or white.   The majority are fitted with internal resistors.  Our AB-AV-1611 and AB-AV-937 momentary switches are produced with a yellow ring, designed specifically to assist the visually impaired.  Our momentary anti-vandal push switches are designed for use in harsh environments and are recognized for their high quality and durability.
Surface Mount Tactile Switch 6x6mm - AB-TS-007AB-TS Series – this is a range of 6x6mm and 12x12mm tactile switches. They are on-off switches with momentary operation.  Available with a variety of button heights and operating forces, our website shows a selection of the most popular items.  If you can’t identify a product with the specification you require, please contact us and we will do our best to source the version you need.

Waterproof Push Button Switch Momentary
As mentioned our P1 Series and SP60 series push switches can be fitted with a splash proof cap to achieve IP65 rating.  If you require a slightly more robust solution, then our stainless steel anti vandal switches are specifically designed for demanding environments.

Illuminated Momentary Push Button Switch
When it comes to illuminated momentary push button switches from Alan Butcher Components it is a choice between the Deca SwitchLab products and the anti vandal switches.  As mentioned, the Deca switches are modular enabling the customer to select the lens shape, colour, lamp (LED, Neon or Incandescent) and connections.   The anti vandal push buttons are available with LED illumination – 12V, 24V and 240V.  Colours range from red, green, blue, orange, yellow or white in ring or dot illumination styles.

Momentary Switch Applications:

The momentary push switch is particularly suitable for applications which require power for a specific time. For example, nurse call systems can use this type of switch to activate an alarm which is pressed by a patient.  The alarm goes off when the button is released so that it isn’t continually activated.  These switches are also widely used in domestic and industrial applications:

  • Intercoms
  • Control panels
  • HVAC equipment
  • Lighting products
  • Domestic appliances
  • Test equipment
  • Security systems and alarms

Our Popular Products

Find Out More
As mentioned, we offer a wide range of momentary switch products. You can download data sheets from individual product pages on our website and also complete a “product enquiry” form to request a quotation or sample.  If you would like us to call you back, please provide your company name and telephone number.

Every application is different and we do our best to identify the most appropriate switch solution for our customers. The strong relationships we have with our customers and suppliers enable us to work together to understand the technical and aesthetic aspects of a design. We ensure there is a person at the end of the phone to answer your call.  We also have area sales representatives who will be happy to visit to discuss your application in person.

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