Solenoid Locking Safety Switches, Separate Acuator and Locking
Euchner TZ

Die cast aluminum, solenoid locking, up to 4 contacts, side actuator entry with 100 mm mounting.
This Safety Switch requires an actuator.

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Safety switches have the task of preventing the operation of a machine in the case of a potential hazard. This task is defined in EN 1088 (Safety of machinery. Interlocking devices associated with guards. Principles for design and selection). For this purpose the safety circuit must be opened by the safety switch. Safety switches are therefore key elements of an interlocking device. In general, a differentiation is made between safety switches with safety function (design type 1 safety switches) and safety switches with separate actuator (design type 2 safety switches).

For safety switches positively driven contacts are used in the switching elements. These are special switching elements that are designed to ensure the switching contacts are always reliably separated. Even if contacts welded together, the connection is opened by the actuating force. It is a common feature of all switching elements that at least one switching element is designed as a positively driven contact. Often two positively driven contacts are employed to increase safety using the principle of duplicated design (redundancy). This dual-channel design ensures that on the failure of one channel or on a fault in the control circuit (i.e. in the machine wiring), the interlocking can still be provided with the aid of the second channel.

EUCHNER Design Type 2 Safety Switches are used to protect personnel by monitoring and interrupting the safety circuit depending on the position of the machine guard. The locking solenoid holds the guard closed until a stored energy hazard has passed. It can also prevent damage to a part in process due to an inadvertent machine shutdown. To meet current worldwide standards, safety interlock components cannot be easily bypassed. These switches have positive opening contacts (in accordance to NFPA 79) and redundancy to guarantee that they fail to a safe state. The metal TZ switch has become a standard within the machining industries and is always evolving with each new innovation to safety switches.

You may also want to check out the TZ extended.

Note: Design type 2 safety switch has an actuator that is separate from the switch body. The two must be combined or separated for switch operation.