EUCHNER – More than safety.
EUCHNER – More than safety.

Safety switch with guard locking CTA-BP

Your advantages

  • Communicating safety switch with guard locking and safe guard lock monitoring
  • Industry-4.0 ready safety category 4 and PL e according to EN ISO 13849-1 Mounting compatible with existing
  • safety switches Retrofittable escape release enables greater flexibility for conversions and retrofits.

Industry 4.0 ready

The switch can communicate in combination with an EUCHNER IO-Link Gateway, and sends process and device data to higher-level control systems. Comprehensive diagnostic messages enable rapid and targeted troubleshooting.


The safety switch CTA combines the proven principle of operation of electromechanical safety switches with guard locking and modern transponder-coded safety engineering. Thanks to the transponder technology, even a single CTA achieves category 4/PL e according to EN ISO 13849-1, without additional fault exclusion, and meets all the requirements of EN ISO 14119. It is ideally suited to applications in which a high Performance Level and a high locking force are required.
Safety switch with guard locking CTA-BP

Versatile use

The CTA reliably secures safety doors and flaps on machines and installations. The CTA is suitable even for harsh, dirty environments. Thanks to the integrated guard locking and guard lock monitoring, it can be used both for process protection and the protection of personnel. Its compact design permits space-saving mounting on the guard. With a guard locking force up to 8,000 N, the CTA effectively prevents the opening of safety doors. The very robust metal housing with metal head as well as the high degree of protection IP65/IP67/IP69/IP69K make the CTA the all-rounder for almost every industrial use.

Mounting and principle of operation

The CTA consists of two components, a safety switch and a separate actuator. The safety switch is mounted on the fixed part of the guard, the actuator on the movable part. The CTA can be approached from four directions. For improved insertion of the actuator, the head is equipped with an integrated funnel. This feature is particularly advantageous on unstable door designs as well as if the door is incorrectly adjusted. When the guard is closed, the actuator moves into the head on the safety switch. The safety outputs are switched on if the integrated transponder chip in the actuator is detected and the guard locking activated. Thanks to the integrated prevention of inadvertent locking position (faulty closure protection), unintentional activation of the safety outputs is prevented if the actuator is not completely inserted into the head.

Diagnostic information

The safety switches of series CTA allow comprehensive diagnostic information to be forwarded to the control system. The devices supply process-relevant parameters in real time. They even provide information on preventive maintenance. The sensors measure relevant parameters in the surroundings to indicate problems before a machine failure can occur. In combination with the IO-Link Gateways GWY-CB and ESM-CB, this information is polled from every switch and provided to the control system via IO-Link.

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Technical support

Technical support
Do you have technical questions about our products, their possible use or applications? Our experts will be happy to help.

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