This Product Selection Guide contains information to help select products in the Limit Switches category on DigiKey.com

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Snap action limit switches are mechanical devices that make or break an electrical connection by closing or opening electrical contacts or solid-state circuitry when actuated by human or mechanical interaction most commonly at a travel limit position. Limit switches are selected by actuator types such as an adjustable plunger or rod, toggle, arm lever, roller, cone, leaf, rotary actuator, spring, whisker, or cable.

SelectionCharacteristics

Circuit: Describes device function in terms of a number of poles and throws, as is typical for mechanical switches. For more information please see: Switch Basics, Examples of Pole and Throw

Switch Function: Refers to the specific operation or behavior of a switch, indicating the primary purpose or mode of operation. For more information please see: Switch Basics, Examples of Pole and Throw

Current Rating (Amps): Typically this represents the maximum current to which a device will meet its given specifications. Exceeding this current may damage the device and/or other system components.

Voltage Rating - AC: Typically this represents the maximum AC voltage rating to which a device will meet its given specifications. Exceeding this voltage rating may damage the device and other system components.

Voltage Rating - DC: Typically this represents the maximum DC voltage rating to which a device will meet its given specifications. Exceeding this voltage rating may damage the device and other system components.

Actuator Type: The specific design or style of the mechanism used to change the switch position.

Mounting Type: Indicates how the device is attached.

Termination Style: Selection of termination style used to connect the device to a system, such as cable leads, PC pins, or wireless.

Ingress Protection: IP (Ingress Protection) Ratings (IP20, IP65, IP67, etc.) - Define how likely it is that water and dirt will get into the system. The first number is for dirt and solid contaminants and the second number is for water.

IP Ratings Protection Level Solids Liquids 1 Protected against solids larger than 50mm. Protected against vertically falling drops of water. Limited Ingress permitted. 2 Protected against solids larger than 12.5mm. Protected against vertically falling drops of water with the enclosure tilted up to 15 degrees from vertical. Limited ingress permitted. 3 Protected against solids larger than 2.5mm. Protected against spraying water up to 60 degrees from vertical. Limited ingress permitted for 3 minutes. 4 Protected against solids larger than 1mm. Protected against water splashing from any direction. Limited ingress permitted. 5 Protected against dust. Limited ingress of dust permitted. Will not affect the operation of equipment for 2-8 hours. Protected against jets of water. Limited ingress permitted. 6 Dust tight. No ingress of dust 2-8 hours. Protected against powerful jets of water. Limited ingress permitted. 7 ______________________ Protected against the effects of immersion in 15cm-1m for 30 minutes. 8 ______________________ Continuous immersion in water up to 3m for long periods of time. 9 ______________________ Protected against high-pressure jets of hot water. (30 seconds) 9K ______________________ Protected against high-pressure jets of hot water. (2 minutes)

Features: These are different capabilities or properties of the device such as LEDs, corrosion proof, or explosion proof.

Operating Force: Refers to the amount of force required to actuate or trigger the switch.

Release Force: The amount to which the force on a switch actuator must be reduced to allow an actuated switch to return to its rest position.

Operating Position: The specific position at which the switch is intended to change its state.

Pretravel: The typical amount of actuator travel between the rest position and the actuation point of a switch.

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Differential Travel: The actuator travel distance between the switch&#;s operation and release points; its mechanical hysteresis.

Overtravel: The amount of switch actuator movement between the operating point and mechanical travel limit.

Operating Temperature: Recommended operating temperature, typically given in a range or as a maximum. Exceeding these temperatures may affect performance or damage the device and other system components.

ProductExamples

MFR PART # DS-080-C PA DIGI-KEY PART # CKN-ND MANUFACTURER C&K DESCRIPTION Switch SPDT Through Hole DATASHEET Click Here

MFR PART # V7-1Z10E9-263 DIGI-KEY PART # 480--ND MANUFACTURER Honeywell Sensing and Productivity Solutions DESCRIPTION Switch SPDT Chassis Mount DATASHEET Click Here

MFR PART # D3D-111 DIGI-KEY PART # SW745-ND MANUFACTURER Omron Electronics Inc-EMC Div DESCRIPTION Switch SPDT Panel Mount, Snap-In DATASHEET Click Here

MFR PART # D2FW-G271M(D) DIGI-KEY PART # SW-ND MANUFACTURER Omron Electronics Inc-EMC Div DESCRIPTION Switch SPDT Chassis Mount DATASHEET Click Here

MFR PART # ZMA00A080S06PC DIGI-KEY PART # CKN-ND MANUFACTURER C&K DESCRIPTION Switch SPDT Through Hole DATASHEET Click Here

MediaLinks

Videos
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Product Training Modules
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If you have any general questions on the specifications for selecting Limit Switches, please reply using the button below. If you have questions on specific Limit Switches please post those questions in the Electromechanical Switches category.

How to Select a Limit Switch?

Limit switch is a device that makes use of the collision of the machine moving parts to make the contacts operating to realize the control circuit is turned on or off, so as to achieve a certain control purpose. It cooperates with other devices to form more complex automation equipments in industry. Therefore, selecting more suitable limit switches will make the entire automatic control system becomes more reasonable and efficient.

There are some key points for chooseing limit switch:

1. Select the limit switches according to the application scenarios and control object.
   When the movement speed of machine is not fast, the limit switches with the general application are usually used. When the path through which the machine travels is not appropriate for the installation of the roller plunger limit switches, the roller lever limit switches should be used.
   Besides, when there are very high requirements on the working efficiency, reliability and accuracy, another kind of switch - proximity sensor should be selected.
2. Select the appropriate actuator form according to the transmission force between the machine and limit switch, as well as the corresponding displacement relationship, that is, select the structural form of the limit switch according to the movement characteristics of the machine.
   Shell: According to the load of the limit switch, for light loads and medium loads, the shell material is mostly plastic. For heavy loads and super heavy loads, the shell material is mostly metal. Therefore, it is required to choose the appropriate shell.
   Actuator: Different acturatos are selected according to the shape and movement direction of the detection target. The types of actuators include roller plunger, top plunger, roller lever, adjustable roller lever, adjustable rod lever, fork lever, and coil spring.
   
3. Select the limit switches series according to the rated voltage and rated current of the control circuit.
4. According to the installation environment to choose the protection mode: open type or protection type.
5. According to the environmental factors such as ambient temperature, vibration and shock resistance, and protection class to select a appropriate limit switch. For example, the waterproof limit switch can be used in the industrial occasions required for waterproof, oil-resistant and dustproof.

In addition to above key points, the following details should also be taken to:

• Contact module: According to the different needs, select different number of contacts, slow-moving contacts or quick-moving contacts.
• Operating speed: It means the maximum allowed triggering speed. If this speed is exceeded, the limit switch may have malfunction or be damaged due to excessive force.
• Cable inlet module: There are several cable inlet that comply with different standards. In addition to the direct wire type of common model, ISO, DIN, NPT and other standard cable types are frequently used. The difference is only the different inside diameter of the thread of the limit switch inlet and the thread pitch caused by different braking types.
• Minimum force: The minimum force required for triggering. There are usually two types of minimum force (N) and minimum moment (Nm).
• The working life: The working life can be divided into machinery working life and electric working life.

Of course, if there is anything you feel unclear about limit switch selection, you can consult online or us. ATO has professional engineers who will patiently solve all the problems related to the limit switch for you.

If you are looking for more details, kindly visit Sealed Limit Switch.