When it comes to controlling something on an industrial level, choosing the right switch becomes more important. Among all the different types of switches available in the market, the selector switches are preferred the most due to their multifunction feature that is controlled with a simple rotation. What is the best switch for you? For example, 2 position switch or 3 positions switch. This guide goes over every important detail you should consider, starting from types, wiring, applications, and more. So, just keep reading!

Selector switches

1) What are selector switches?

This is one of the switches available in the electricity system, that allows users to choose between two or more circuits. It is mostly employed in automation and machine industries where many program settings or functions can be activated. Unlike a simple switch with two positions, a selector switch has many positions like 3 pos switch and more. Thus, it can achieve greater control of multiple functioning levels within a certain machine or system.

What is selctor switch

A selector switch has both types; rotary and lever. The user indicates the desired position by turning the knob in a particular direction. Some of them are called momentary models which means they are spring-loaded. They will automatically go back to their home position when released, others are maintained models that will remain stationary until they are moved manually.

One of the best benefits that comes from using selector switches is the improved streamlining efficiency. Instead of employing different switches for different tasks, a single selector switch can easily control more than one task. Thanks to this, usability has improved and so have the rewiring problems.

Selector switches have various designs such as a key-operated type that is more secure and has a handle style that is easier to operate. Other more advanced styles include illuminated versions which can increase visibility. Selector switches have been designed for durability and reliability which makes them ideal for such harsh environments.

Ritesh C. G. an engineer shared a comprehensive definition of selector switches in comparison with push buttons. He said that the selector button is meant to open and close the contacts while contacts are interchangeable with push buttons. Read the comment below and you will be more clear!

2)  CDOE Selector Switches Key Features

CDOE’s selector switches are perfectly designed to meet the varying and dependable control switch requirements of different industries. Some essential features are:

CDOE selector switch features

+ Multiple Function Selections: Each of these switches has two or three positions which can be chosen accordingly.

+ User-Friendly Operation: The switches can be operated by anyone since they identify various positions or states that do not require specialist knowledge to operate.

+ Safety and Reliability: The design ensures that induction of an arc or a short circuit does not take place while the circuit is switched, which improves safety and reliability.

+ Certification: UL, Reach, CCC, and CE-certified CDOE switches have passed the quality and safety standards mark for their use internationally.

+ Waterproof Rating: The switches have either IP40 or IP65 ratings, for different models, which grant them different levels of protection from water and dust.

+ Mounting Hole Sizes: They come in various sizes such as 16mm, 19mm, 22mm, and 30mm so these switches can be mounted according to different needs.

+ LED Indicators: Certain models are equipped with LED lamps in red, green, and blue to serve as visual indicators of the status of the switch.

• Product Examples:

Metal Selector Switches (19mm, 5A): These switches are maintained in 3 positions for industrial use, have a mounting hole of 19mm, are capable of a 5A current, and have arrow LED indicators.

2-Position Selector Switch (22mm, 20A): This high-current switch has a mounting hole of 22mm and a current capability of 20A. This switch is available as normally open and normally closed.

3 Position Selector Switch (22mm, 10A): This LA38 model has a mounting hole dimension of ten millimetres with a current capability of 10A. It has a quick assembly feature with 3 rotary switches with 2 of them having normally open contacts.

With more than 20 years of industry experience, CDOE has developed and continuously develops selector switches to meet varying functional requirements with quality and performance across a range of applications.

3) Types of selector switches

Selector switches are categorized depending on the operating mechanism, design of the handle, and the number of positions. The application and particular control needs dictate which type is most suitable.

Based on Operating Mechanism

i) Maintained (Latching) Selector Switches

Latching selector switches can be set to a certain position and will remain there until manually changed. When a person turns the predetermined position of the switch, he does not have to keep on pressing it to make it stay there. In an industrial facility, these switches are often found because once a function is completed, it does not need to be switched off manually.

• Common Uses:

• Controls for machine start-up and shut-down
• Security systems in Electrical Panels
• Surveillance systems

ii) Momentary (Spring-Return) Selector Switches

Return momentary selector switches, which activate on the switch press, snap back to a previous position as soon as the finger is removed from the switch. This occurs because of a spring that is located inside the switch. This type of switch works best in applications that require temporary needs, like motors or signaling devices.

• Common Uses:

• Controls for jogging the machine  
• Systems granting access through a door  
• Activation of a temporary signal  

Based on Handle or Actuator Design

i) Short Handle Selector Switches  

Short handle selector switches

Short handle selector switches use a short lever for operation. These switches are perfect for small areas and applications that require rapid changes. They limit the chances of being bumped accidentally as a result of having a shorter handle.  

• Common Uses:

• Small control systems  
• Automation systems in industries  
• Appliance products  

ii) Long Handle Selector Switches  

Long handle selector switches

They have a longer handle which makes it easier to operate. The length makes it easier to grasp when trying to turn the knob, especially with gloves on. They are ideal for situations with low visibility and high usage.  

• Common Uses:

• Controls in heavy-duty machines  
• Electrical panels exposed outdoors  
• Automation in factories  

iii) Key Operated Selector Switches  

Requires a key for a position to be changed. It enhances security by preventing unauthorized changes. Often used in systems where access is restricted.

• Common Uses: 

• Security systems  
• Power distribution panels  
• Control of ignition for vehicles  

iv) Illuminated Selector Switches

Illuminated selector switches

The lights improve visibility during the switch’s position indicator and also serve as instant feedback.

• Common Uses: 

• Control stations  
• Emergency shutdown panels.    
• Electrical control boards    

v) Non- Illuminated Selector Switches

Non Illuminated selector switches

These do not feature any accompanying light. They are less sophisticated in form and function in instances where an indication is not essential.  

• Common Uses: 

• Control consoles.  
• Uncomplicated on/off functions.  
• Manual and mechanical control operations.  

Based on the Number of Positions & Electrical Configuration

i) 2 Position Selector Switches

2 Position switch

Users can switch between two options with ease using 2 position rotary selector switche, which include, but are not limited to, ON/OFF and START/STOP. They are frequently used in tasks that need a straightforward choice between two actions.  

• Common Uses: 

• Power switches.  
• Safety cut-off systems.  
• Equipment selection.  

ii) Multi-position selector switches

Providing more than two selection possibilities includes multi-positions. They are employed in tasks where numerous modes or functions need to be operated with sole control. These may be 3 position switches or 4 positions.

3 position switch

• Common Uses: 

• Fan speed control.  
• Machine function selection.  
• Multi-speed motor-control.  

4) Selector switch symbol

In electric diagrams, they are represented with certain functions and operations, where unit blocks of functions are executed by electric switches which are easily manipulated. Below is one of the commonly used multi-function switches.

• SPDT toggle switch: It is a symbol of a single pole double throw switch. This switch can connect either of two circuits to a single output or vice versa.

• SPST Toggle Switch: Represents a single-pole, single-throw switch a.k.a disconnector or two-position switch; An electrical switch that is used to disconnect current when opened.  

• Pushbutton Switch (N.O): Denotes a momentary open switch that closes when it is pressed on.  

• Pushbutton Switch (N.C): Denotes a normally closed switch that is momentary and opens when pressed.  

• DIP Switch: Diagram interface uses a Dual In-line Package (DIP) switch for onboard configuration.  

• Limit Switch: Denotes a switch put on an object machinery to stop an over-travel limit. It is operated manually and set by a user limit.  

• Time Switch: Denotes a switch to work with time after a set period or set timer.

• Thermal Switch: Denotes a provided switch for overheating protection that reacts to heating or cooling temperature changes.

• Pressure Switch: Denotes a switch that sets on an action state and responds upon reaching the level of pressure fluid and is regularly used in fluid systems.

These designs ensure and maintain global site functionality for linking and distinguishing the different types of electric switches in circuit diagrams, which allows optimal interaction between designers and communicators of electric control systems and devices.

5)  Which Applications Use Selector Switches?

Such control devices can be integrated into many branches of industry and have distinctive characteristics differing precisely in the pitch of the controller. Here are of importance the number of seven sectors where such control devices can be understood:

• Automation: In industries and production amenities, these types of switches are important to alternate on State like functioning or manual or maintenance switches while having control of conveyor belt robotic arm and assembling machines.

• Power Systems: Electric peculiar panels by used splitter devices change the power supply from an electric main to a generator.

• Machinery Manufacturing: In a manufacturing plant, machines require quick mode selection for quite a number of operations. With the help of selector switches, operators can alter speeds, as well as start and stop operations or functions like forward and reverse movements.

• HVAC Systems: Heating, ventilation, and air conditioning systems require selector switches to control fan speed and toggle between heating and cooling modes. They can also change the ventilation settings in commercial and residential units.

• Control of Elevators and Escalators: Within lift systems, selector switches allow maintenance staff to switch from normal operation to service mode in a controlled manner for effective and safe maintenance.

• Medical Equipment: Hospitals have incorporated diagnostic machines, X-ray systems and medical treatment devices with selected switches so that medical practitioners can use them to pick different modes and set them accordingly.

These types of switches are required almost universally as they enable the control and operation of processes in many different fields and industries seamlessly.

6) How to wire a selector switch?

Wiring a selector switch is dependent on the type of switch, the relevant function, and the circuit it is connected to. Below is a rough guideline for wiring a normal 2 or 3-position selector switch into an electrical circuit and its primary components.

• Required Tools And Materials:

• Selector switch
• Electrical wires
• Screwdriver
• Wire stripper
• Multimeter (for testing)

• Step-by-Step Wiring Guide:

Step 1) Turn Off Power: Disconnection of the power line should be done to avoid any electric shocks during the switching process.

Step 2) Identify Terminal Connections: A majority of selector switches will come with Normally Open (NO) and Normally Closed (NC) terminals. You have to refer to the switch diagram supplied alongside the switch to check its terminals.

Step 3) Connecting wire: First, one NO terminal of the switch with the load and the other NO terminal of the switch with the positive terminal of the battery. Now Connect the negative terminal of the battery with the remaining wire of the load. That’s all!

Selector switch method of wiring

Step 4) Secure Connections: Make sure tight connections were made using the terminal screws so all wires are in position.

Step 5) Test the Wiring: Rotate the switch, and the load will be on. When you spin it again, the load will be disconnected.

Step 6) Final Check: All limbs must have the cable reduced to make contact with each other so there aren’t any short circuits. Once all the tests are done, the selector switch is ready to be used in the control circuit.

7) How do you choose a selector switch?

Different factors influence the choice of a selector switch, such as application needs, electrical parameters, and the surrounding environment. The following is an organized process that aids in deciding the most suitable selector switch:

Choose the best selector switch

a) Know the Application Needs

Know what the function of the switch is. For instance, is it used for motor control, power selection, or mode switching? Think of the nature of the operation (momentary or maintained) required.

b) Choose a Handle or Actuator Style

• Short Handles: Best for narrow areas.
• Long Handles: Easier to grip and use.
• Key Operated: Restricts unwanted access.
• Illuminated: Useful in poorly lit areas.

c) Number of Positions

• 2-Position Switches: Simple ON/OFF operation.
• Multi-Position Switches (3, 4, or more): Used for the selection of various operations/modes.  

d) Electrical Ratings

Make sure that the desired and provided ratings for the switch are voltage and current for interaction at safe limits.

e) Safeguard Measure Verification

For extreme conditions, use switches rated IP65 or higher to provide adequate protection against water and dust ingress.

Considering all these factors will help you in selecting the right type of selector switch for your needs while ensuring the switch provides the needed durability.

Lastly, the most important thing is to select a reliable supplier of switches like CDOE. Our high-quality switches will serve appreciably in every sector. You can contact CDOE just by clicking here.

8) FAQ

1. What is a selector switch used for?

A selector switch is mainly used to change circuits by selecting a particular function, mode, or power source for automation devices, control consoles, and industrial machines.

2. What is the difference between a rotary switch and a selector switch?

A rotary switch has several circuits, turning in steps, while a selector switch employs a number of positions, usually maintained or momentary functions, in specialized applications.

3. What is the difference between a push button and a selector switch?

The push button switch engages or disengages a circuit within the limits of time, while the selector switch can remain in a given position until it is manually turned. For that reason, they are controlled continuously for different modes or functions.