Contact Sensors

Contact sensors are used to determine the position, movement, opening, closing, or when an object reaches a specified point. They activate upon direct contact with a mechanical element or when the state of an electrical contact changes, transmitting a signal to the control, alarm, or protection system.

Such sensors are used in industrial automation, machine tools, conveyors, packaging equipment, elevators, door systems, control cabinets, transport mechanisms, security, and access control systems. A contact sensor allows precise detection of equipment status: open or closed position, end point of movement, presence of an object, or mechanism actuation.

Main Types of Contact Sensors

Depending on their design and purpose, contact sensors are divided into several main types.

Limit Switches
Limit switches are used to monitor the extreme position of moving mechanisms. They activate when pressing a lever, roller, plunger, or another actuator element. Such sensors are often used in machine tools, lifting equipment, conveyors, automatic gates, and production lines.

Mechanical Contact Sensors
These are simple and reliable devices that change the state of an electrical circuit upon physical pressing or movement of an operational element. They are suitable for controlling the position of parts, units, covers, valves, doors, and moving parts of equipment.

Magnetic Contact Sensors
These sensors operate together with a magnet and are often used to monitor opening or closing of doors, hatches, windows, protective covers, and cabinets. They are compact, easy to install, and can be used in both industrial systems and security automation.

Micro Switches
Micro switches have a short actuation travel and high repeatability. They are used in devices, automatic mechanisms, control systems, household appliances, electrical panel equipment, and industrial nodes where precise position change detection is required.

Safety Contact Sensors
Used to monitor protective doors, enclosures, covers, and emergency positions of equipment. They help stop the mechanism when a hazardous zone is opened or safe operating conditions are violated.

Position Sensors with Contact Output
These models transmit a discrete signal when a set position is reached. They can be used in drives, cylinders, valves, shutters, actuators, and automatic control systems.

Where Contact Sensors Are Used

Contact sensors are used where it is necessary to reliably determine the mechanical state of an object or the position of a moving element.

Main application areas:

• industrial automation;
• machine tools and production lines;
• conveyor systems;
• packaging equipment;
• elevators and lifting mechanisms;
• automatic doors, gates, and barriers;
• access control systems;
• security alarm systems;
• electrical cabinets and distribution panels;
• pneumatic and hydraulic mechanisms;
• transport equipment;
• machine safety systems;
• position control of valves, shutters, and covers.

In industry, contact sensors allow monitoring of end positions of mechanisms, synchronizing equipment operation, and preventing accident situations. In safety systems, they detect opening of doors, hatches, or protective covers and send signals to controllers or relays.

Types of Output Contacts

Contact sensors may have various connection schemes depending on the task and system logic.

Most common options:

• normally open contact — NO;
• normally closed contact — NC;
• changeover contact — NO/NC;
• relay output;
• reed contact;
• contact with or without latching;
• cable connection;
• plug-in connector connection.

A normally open contact closes upon sensor actuation. A normally closed contact, on the contrary, opens at the set state. A changeover contact allows using both logic options within one system.

How to Choose a Contact Sensor

When choosing a contact sensor, it is important to consider operating conditions, type of mechanism, and signal requirements.

Key selection parameters:

• sensor type: limit switch, micro switch, magnetic contact, or safety sensor;
• contact scheme: NO, NC, or changeover contact;
• allowable switching voltage and current;
• type of actuator element: roller, lever, plunger, button, pusher;
• mechanical life;
• actuation speed and frequency;
• degree of enclosure protection;
• housing material;
• mounting method;
• type of electrical connection;
• operating temperature;
• resistance to dust, moisture, vibration, and mechanical loads;
• requirement for use in safety systems.

For simple mechanism position control, a limit switch or micro switch is usually suitable. For doors, hatches, and cabinets, magnetic contact sensors are convenient. For equipment with increased safety requirements, it is advisable to choose special safety contact sensors with corresponding characteristics.

Advantages of Contact Sensors

Contact sensors remain a popular solution due to their simple design, clear operating logic, and high reliability.

Main advantages:

• precise determination of object position;
• easy integration into control systems;
• clear discrete signal;
• affordable cost;
• wide range of designs;
• ability to work with different types of equipment;
• high repeatability of actuation;
• compatibility with relays, controllers, and alarm systems;
• reliable operation in industrial environments.

A properly selected contact sensor helps increase equipment safety, automate mechanism position monitoring, and reduce the risk of errors in production system operation.

Buy Contact Sensors

Our catalog features contact sensors for industrial automation, safety systems, position control, electrical panel equipment, door systems, and production mechanisms. Available are limit switches, micro switches, magnetic contact sensors, safety sensors, and models with different contact types.

We will help you select a contact sensor according to installation conditions, equipment type, connection scheme, switching voltage, and reliability requirements.