Coupling Relays and Signal Converters

Coupling Relays

We offer a diverse range of coupling technology for electrical isolation, amplification and signal adjustment between the controller and I/O. Thanks to their wide voltage supply range, the coupling relays can be used worldwide without any problems.
With their new titanium gray design, the slim SIRIUS 3RQ3 devices present a uniform look that matches that of other SIEMENS switching devices in the control cabinet.


Power Relays

The 3TG10 power relays come as the ideal solution for all applications requiring small, low-noise relays or contactors at low costs. The power relays are suitable for basic controls and particularly for use in large-scale series devices and controls. They are ideal for applications which require only one auxiliary contact and no overload relay – and place increased requirements upon switching capacity, switching voltage and service life.


Interface Converters

3RS7 interface converters are mainly used to electrically isolate and convert analog signals. Sensors/actuators and controls generally have different power supply units, and therefore require electrical isolation in the signal circuit. This is either integrated in the control or is implemented using an interface converter. A signal has to be converted into another signal if, for instance, a voltage signal needs to be converted for transmission over a long distance into a current signal, or if the output of a sensor and the input of a control are not compatible with one another. The frequency outputs implemented offer a further application. In this case, the input signal is converted into a proportional frequency. This means that analog signals can be processed with digital inputs. This is important if the control does not have provision for an analog input, or if all of its analog inputs are already assigned, e.g. when devices are retrofitted.