SIRIUS 3SK Safety Relays - Safety is a SIRIUS business

Safety is a SIRIUS business: The Siemens SIRIUS 3SK clearly proves that safety applications can be impemented quickly, efficiently, and easily. This flexible family of safety relays with modular design has been enlarged with the addition of the new SIRIUS 3SK2 safety relays. They are logical development of the 3SK1. When safety concepts that require multiple safe disconnection

Fail-safe motor starters in the 3SK1 system - at the SPS IPC Drives 2013

Classic control technology meet safety technology with the SIRIUS 3RM1 Failsafe motor starters. This saves wiring and space in the control cabinet. You can also boost your plant productivity thanks to integrated overload protection.

Trade fair video: SIRIUS 3SK1 Safety Relays

In the following film, you can find out how flexible the new safety relays are, and where safety relays can be used.

Safety-relevant switch-off

Safety applications like protective door monitoring can be easily implemented with the SIRIUS 3SK1 safety relays. You can see here precisely how this works. The safety chain - sensing, evaluating and responding - is shown in detail.


System overview

Find out how easy it is to achieve a safe plant with the new SIRIUS 3SK1 safety relays. Without cutting back on productivity. Protect your personnel quickly and easily with simple safety applications such as protective door monitoring and EMERGENCY STOP pushbuttons.


System expansion

The SIRIUS 3SK1 Safety Relays give you flexibility in configuring and commissioning, and even when expanding or adapting plants. This animation shows how easy it is to expand when the productivity of the plant is to be increased with a second conveyor belt. Simple adaptation is possible thanks to the modularity of the 3SK1 system.


Power supply

With the Advanced range of safety relays, you save on wiring. The devices can be simply clicked onto the device connector - and you're ready to go. All the devices can then be supplied with power via the device connector.


Signal exchange

The functional principle of the safety chain - sensing, evaluating and responding - is shown here. Signal exchange between the input expansion, the basic units and the output expansion using the device connector is shown in detail. Even time-delayed shutdown is possible with the safety relays.


Exchanging terminals

No more replacing devices when a terminal is defective! The innovative housing design for the SIRIUS 3SK1 Safety Relays makes it possible to replace a defective terminal individually: just open the cover flap, detach the wiring of the terminal, push up the terminal fastener and remove the defective terminal. Then snap the new terminal into the fastener, reconnect the wires and close the cover flap. Done! The rest of the wiring stays just as it is, saving both time and effort.


Covering and labeling terminals

The cover flaps of the terminals are inscribed on the inner side to simplify the assignment of the wires to the correction connection. The flaps are opened for wiring, so that the information is easily visible before and during insertion of the wires. Afterwards, the flaps are closed again.


Screw connection

Something good is now even better: All SIRIUS 3SK1 Safety Relays and SIRIUS 3RM1 Motor Starters are available with optimized screw connections. The insertion angles for wiring and screwing have been adjusted so that wires and screwdrivers can be inserted into the terminals from the same direction - everything is easily visible.


Spring-loaded connection

There's a new way to make wiring easier: All SIRIUS 3SK1 Safety Relays and SIRIUS 3RM1 Motor Starters are also optionally available with spring-loaded connections that can be wired to the sensors and actuators without a tool. Simply insert the wire by hand at an easy-to-see angle in the terminal and you're done. The terminal operation for detaching the wiring is performed at the same angle.



Here's how to protect your device settings and system against unwanted access: SIRIUS 3SK1 Safety Relays can be secured with a lead seal covering and a lead seal wire on the front side. This prevents a displacement of the rotary coded switch setting and changes to the DIP switch position on the safety devices.