Safety Switches with Plastic Housing
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Safety Switches with Plastic Housing

Internationally successful – the EUCHNER company EUCHNER GmbH + Co. KG is a world-leading company in the area of industrial safety technology. EUCHNER has been developing and producing high-quality switching systems for mechanical and systems engineering for more than 60 years. The medium-sized family-operated company based in Leinfelden, Germany, employs Headquarters in Leinfelden-Echterdingen around 750 people around the world. 18 subsidiaries and other sales partners in Germany and abroad work for our international success on the market. Quality and innovation – the EUCHNER products A...

About this catalog 4 How can I find the right switch? 4 Function and technology used in safety switches 5 Safety switches type 1, plastic housing 13 Safety switches type 2, plastic housing 21 Safety switches NM..VZ 21 Safety switches SGA, metal housing 39 Safety switches TP with guard locking and guard locking monitoring 43 Safety switches STP with guard locking and guard locking monitoring 61 Safety switches STA with guard locking and guard locking monitoring, metal housing 75 Safety switches STM with guard locking and guard locking monitoring 83 Safety...

General About this catalog The Safety Switches with Plastic Housing catalog gives you an overview of our safety switches and our rope pull switches. For numerous applications these switches are the right choice due to their economy and flexibility. You will find the technical data after the product overview. There is a reference to the page with the related technical data on the pages listing the products. At the front of the catalog you will find useful information on the topic of safety switches. We have prepared an overview of the standards and a glossary on this topic in the appendix....

General EUCHNER Standards and approvals Standards Safety switches must meet the requirements for safety components as per the Machinery Directive. The Machinery Directive has been implemented in national law in the EU member states and, as a result, is binding for all manufacturers. Detailed requirements for the switches are defined in DIN EN 60947-5-1 (Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching elements. Electromechanical control circuit devices). If the requirements of this standard are met, conformity with the applicable laws and therefore...

General Switching elements Different switching elements are available for the switches offered in the catalog: Single switching element Double switching element with two independent switching contacts Triple switching element with three independent switching contacts Quadruple switching element with four independent switching contacts Safety switch type 1 with rounded plunger Switching contact 2 Safety switches type 2 On safety switches type 2, the actuating element for the switch is coded. The actuating elements are available in various versions to suit the guard that is to be monitored....

General Monitoring contacts On snap-action switching elements, the change from the completely closed state to the completely open state is made at a defined point. As a result the operating point is at a defined position, unlike on slow-action contact elements. Snap-action switching elements typically have a switching hysteresis. No snap-action switching elements are available for the safety switches in this catalog. Door monitoring contact and interlocking solenoid monitoring contact In addition to the safety contacts, monitoring contacts are also required, for example, to indicate the...

General This feature guarantees protection for anyone (e.g. maintenance or service personnel, or cleaning staff) who needs to enter potentially hazardous areas. The switches cannot signal a safe (closed) state with a lockout bar fitted. As a result unintentional starting of the machine is not possible. Guard locking Safety switches type 2 are available both with and without guard locking. Guard locking is a feature that prevents the unintentional opening of a door as long as there is a hazard. The door is locked by preventing the removal of the actuator from the safety switch. The series...

General Changing the switching direction Switch head Actuator Guard locking solenoid In addition, in the case of the NM.HB series, the actuating direction can be adjusted such that the actuator only switches in one direction. Rotate the actuating element Simultaneously press and rotate the washer Principle of operation of STM The sectional drawings show the safety switch STM in its three switch states: ᕡ Door open and not locked -90° Left switching Left / right switching (default setting) In the initial state (actuator removed/guard open) all positively driven contacts (SK and ÜK) are open....

General ᕣ Door closed and locked After the actuator has been inserted, it is possible to activate the switch’s guard locking. If the guard locking solenoid is activated, the locking arm locks the plunger and actuates the switching element ÜK. The contacts 11-12 are closed on this switching element. The contacts 11-12 on the switching element SK continue to remain closed. In this position the positively driven contacts 11-12 on the two switching elements SK and ÜK are safely locked, the monitoring contact 23-24 is open. The actuator and the guard are locked. This means that the machine...

General ᕣ Door closed and locked After the actuator has been inserted, it is possible to activate the switch’s guard locking. When the guard locking solenoid is activated, NO contact 33-34 is opened and signals the condition Locked. The NO contact 1314 signals the condition Door closed as before. The positively driven contacts 21-22 and 41-42 were closed when the guard locking solenoid was activated. The actuator and the guard are locked. This means that the machine connected to the safety circuit can be started. Door closed and locked The first guard locking pin is released by inserting...