Range of application
The position switches with a safety function are suitable for sliding and hinged guard devices, which must be closed in order to guarantee the necessary operational safety. In combination with an appropriate safety control module, all safety switches shown in this chapter achieve SIL 3 according to EN 62061 and
PL e according to EN ISO 13849-1.
Position switches are used where moving parts of machines and industrial plants have to be positioned, controlled and monitored.
The various application fields, ranging from fine mechanics to heavy-duty machinery, require different materials, electrical capacity and quality criteria regarding construction and design.
Design and operating principle
Many of the position switches fulfil the requirements of the EN 60947-5-1 standard and can therefore also be used as position switches with safety function. These products are identified by the symbol for positive break. Some position switches fulfil the requirements for standardised switches to EN 50041 or EN 50047. On the position switches with a safety function, the guard device and the positive break NC contact are positively linked. With the safety guard in closed condition, the position switch with safety function is not operated. On sliding guards one switch is actuated and one switch is not actuated so that there is a change when opening and closing the guard door.
The position switches are available with snap and slow action and can be supplied with a metal roller on request. A large variety of actuators complete the program.
All position switches with safety function shown in this chapter bear the CE mark according to the Machinery Directive 2006/42/EC. All position switches shown in this chapter bear the CE mark acccording to the low Voltage Directive 2014/35/EU.