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Limit switches are the most common sensing devices in industrial controls, providing an electric signal when an object physically contacts and moves the actuator. They are suitable for a wide range of applications and harsh environments due to their ease of installation, reliability, and rugged design.
Limit Switches
Category Selection
Limit switches are useful in a wide range of presence sensing applications including those in harsh environments due to their ease of installation, reliable operation, and rugged design. Limit switches are typically used in physical contact applications that can cause wear and tear on the switch actuator and electrical contacts, so exceeding two operations per second should be avoided. When selecting a limit switch, consider the application and actuation method first, as often they are the clearer determining factors. Limit switches are available in a variety of configurations, including the style of the actuator, type of movement, and object travel orientation.
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Plunger Actuator
Limit switches with a plunger actuator activate when an object or mechanism depresses the plunger. These actuators work well to detect minuscule machine motion, available in types ranging from high-precision touch to heavy-duty IEC and NEMA-rated switches.
Plunger with Roller Actuator
Limit switches with a plunger plus roller actuator activate when an object depresses the plunger; the roller is useful for contour following or to allow objects to pass easily. They are available in types ranging from micro-sized to heavy-duty IEC and NEMA-rated switches.
One-Way Lever with Roller Actuator
Limit switches with a one-way lever plus roller actuator activate when an object depresses the top-mounted lever that in turn activates a plunger. The lever angle is designed for one-way travel; the roller allows objects to pass easily. Available models include micro-sized and IEC-rated switches.
Lever Actuator
Micro limit switches with a lever actuator activate when an object depresses the top-mounted lever that is used to activate a plunger. Available with fixed or hinged levers, these small-dimension models offer reliable, repeatable contact closure and provide extremely long service life.
Lever with Roller Actuator
Micro limit switches with a lever plus roller actuator activate when an object depresses the top-mounted lever that is used to activate a plunger. The roller end of the lever allows for objects to pass freely. Available with fixed or hinge levers, these small-dimension models offer reliable, repeatable contact closure and provide extremely long service life.
Side Rotary Lever with Roller Actuator
Limit switches with a side rotary lever plus roller actuator activate when the side-mounted lever is pushed past a certain angle; the roller allows objects to pass easily. In types ranging from compact-sized to heavy-duty IEC and NEMA-rated switches, models include fixed or adjustable lever, and adjustable head styles.
Side Rotary Rod Actuator
Limit switches with a side rotary rod actuator activate when the side-mounted rod is pushed past a certain angle. In types ranging from compact-sized to heavy-duty IEC and NEMA-rated switches, models include fixed or adjustable rod length and resting angle, adjustable head, and nylon loop styles.
360 Degree Rod & Spring
Limit switches with 360 degree rod and spring actuators activate when the top-mounted actuator is pushed past a certain angle in any direction. The incorporated spring allows the actuator to return to the original position once the object is no longer detected. Available in types ranging from compact-sized to heavy-duty IEC and NEMA-rated switches, select models offer a non-marring polyamide tip that slides easily over most surfaces.
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