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Range of application
Ex position switches are used where moving parts of machines and industrial plants have to be positioned, controlled and monitored.
The Ex safety position switches are suitable for sliding and hinged safety guards, which need to be closed to ensure the necessary operational security. In combination with guard door monitors, all Ex switches shown in this chapter achieve PL "e" per EN ISO 13849-1 or up to SIL 3 per EN 62061, subject to suitable circuit arrangements.
Design and operating principle
Many of the Ex position switches fulfil the requirements of the IEC 60947-5-1 standard and can therefore also be used as Ex position switches with safety function. On the Ex safety position switches, the guard device and the positive break NC contact are positively linked. When the guard device is closed, the position switch is not actuated. 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. These products are identified by the symbol for positive break.
Some Ex position switches fulfil the requirements for standardised switches to DIN EN 50 047 or DIN EN 50 041.
The position switches are available with snap and slow action and are available with different contact configurations. A wide range of actuators completes the program. Most of the switches can be supplied with a metal roller on request.
The Ex position switches shown in this chapter bear the CE mark according to the Low Voltage Directive 2014/35/EU and to ATEX 2014/34/EU. The Ex position switches per equipment category 3D bear the CE mark without the number of the notified body and have received a EU declaration of manufacturer conformity.
All Ex position switches with safety function bear the CE mark according to the Machinery Directive 2006/42/EC and according to ATEX 2014/34/EU. The Ex position switches with safety function per equipment category 3D bear the CE mark without the number of the notified body and have received a EU declaration of manufacturer conformity.