Safety Relays

With the safety relays of the SR series, Zander offers a series for the protection of humans as well as machines. They monitor the function of the connected safety sensors along with the wiring and function as power amplifiers for shutting down the connected power contactors or drives in a safe manner.

Safety relays are primarily used for monitoring safety functions. Typical applications include emergency stop switches, safety interlocks, protective mats, safety rope switches and other safety-related control systems. They are designed to detect malfunctions in devices, sensors or actuators and, if necessary, to bring machines or systems to a safe standstill. By using safety relays in the control systems, the safety of the machines can be guaranteed and potential hazards for the operating personnel and damage to the systems can be prevented.

In contrast to conventional relays, safety relays have a positively driven contact structure consisting of two types of contacts: A and B contacts, which are isolated from each other and must operate independently.

A safety relay can be connected to an emergency stop switch, for example. In this case, the system provides a safety function in which, for example, a contactor opens or closes the motor circuit when the switch is actuated. If the emergency stop button is pressed during operation, the motor stops immediately.

All the safety relays of the SR series fulfill the requirements defined by the applicable standards, right from emergency stop and safety door monitoring to 2-hand applications to furnaces in continuous operations and are tested and certified by independent testing institutes such as TÜV-Rheinland, Underwriters Laboratories or DNV GL, RINA as well as CCC.

No matter in which industry they are needed: We have the right safety relays, safety controller, safety time relays, safe coupling relays and extension modules. 

The SR4C safe time relays are available in several combinations of delayed / undelayed contacts.