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Safety relays PNOZsigma

Maximum functionality in minimum width

The safety relays PNOZsigma combine many years of experience with today's very latest safety technology: you can achieve maximum safety and cost-effectiveness with minimum effort.

With particularly narrow housing widths and multifunctionality compressed into each unit, PNOZsigma provides maximum functionality in minimum width. Use safety technology that

  • saves more space,
  • is more flexible,
  • quicker,
  • and therefore more efficient.



Use the PNOZsigma to monitor the following safety functions:

The sum of our experience

Selectable operating modes for maximum flexibility

Using operating mode selector switches you can set your PNOZsigma unit to suit your own process and safety requirements:

Selectable operating modes enable one PNOZsigma unit to be used for a whole range of applications

  • Selectable reset modes: manual, automatic, monitored, with start-up testing
  • Selectable operating mode: With or without detection of shorts across contacts
  • Selectable time delays between 0 ... 300 seconds
  • Selectable timer functions: delay-on energisation, delay-on de-energisation, pulsing

Widths from 12.5 mm

Smaller widths save space in the control cabinet

Multifunctionality compressed into minimum space: PNOZsigma units are up to 50% narrower than standard safety relays - saving you space in the control cabinet and also reducing costs.

6 LEDs for diagnostics in seconds

6 descriptive LEDs for diagnostics at a glance

Each PNOZsigma unit has 6 descriptive LEDs to display switch and fault conditions: Power, In1, In2, Out, Reset, Fault. So diagnostics are available quickly when servicing and there's no need to connect external measuring devices.

Just "click" to expand the contacts

Using connectors to expand the contacts reduces the amount of wiring involved

Jumpers can be used to connect contact expansion modules to the respective base unit. There's no wiring involved whatsoever!

New spring-loaded technology

New spring-loaded technology - Terminal points can be opened together or separately

PNOZsigma units are available with proven, screwless spring-loaded terminals as well as screw terminals. These ensure that the wiring work is completed quickly and that the wires are held securely via the cage clamp.

A special feature of the PNOZsigma is the new spring-loaded technology for opening specific terminal chambers: each terminal point - in other words each input or output - has two terminal chambers, which on the PNOZsigma can either be opened together or separately. So a fitter can specifically remove the relevant wire individually, without pulling out any of the other wires unintentionally.


Rapid assembly on to top hat rail

Simply clip on and off, no need for tools

The PNOZsigma housing is simply clipped on or off using spring clips - there's no need for tools. So top-hat rail assembly is particularly quick and easy.

Uniform functional setup makes engineering easier

Standardised functional setup

The layout of the functions and operator elements on each PNOZsigma is standardised. The terminals are labelled and positioned identically. So connections and devices can always be assigned quickly for configuration, installation and diagnostics.  

Protection from manipulation and contamination

Lockable cover

To protect against manipulation and contamination, all the setting elements are protected by a cover flap, which can also be sealed if necessary.

Convenient speed monitoring – PNOZ s30

As the new Machinery Directive becomes valid, a new requirement in the field of drive monitoring comes to the fore: When the drive is brought to a standstill, the operating status must be safely monitored and maintained.

PNOZ s30 fulfils all the requirements which provides safe monitoring of standstill, speed and direction of rotation. So the right speed monitoring solution is available for each application.

Your benefits at a glance

  • Increased productivity and safety for operating personnel thanks to safe monitoring of standstill, speed and direction of rotation
  • Save time during setup and when units are exchanged, thanks to convenient operation via rotary knob (push and turn)
  • Save time during commissioning and when units are exchanged, as parameters are saved on to chip card
  • Productivity is increased by avoiding unnecessary shutdown processes: advance warning is given when a defined warning threshold is reached
  • Suitable for all common motor feedback systems and proximity switches
Safe firing with PNOZ s4.1

Safe firing with PNOZ s4.1

Thanks to three safe, diverse safety contacts, the PNOZ s4.1 is approved for use in burner controls. It is approved in accordance with the standard EN 50156-1 for electrical equipment on furnaces, in particular with regard to the requirements for application design and installation.

Multiple expansion with PNOZ s7.1 and PNOZ s7.2

Multiple expansion with PNOZ s7.1 and PNOZ s7.2

With a base unit and a PNOZ s7.1, the number of safety contacts can be expanded almost without limit. Up to ten PNOZ s7.2 can be connected to a PNOZ s7.1. If you need more contacts, an additional PNOZ s7.1 can be added to the series. No wiring is involved – just a connector and one simple hand movement. At just 17.5 mm wide, the PNOZ s7.1 has three safety contacts, while the PNOZ s7.2 has four safety contacts plus one auxiliary contact. They can be combined with other PNOZsigma expansion units at any time.

Implement safety technology economically with PNOZsigma - from planning to service


The ideal solution – From planning to service

PNOZsigma is the ideal solution for monitoring safety-related functions such as

  • E-STOP
  • Safety gates
  • Light grids and
  • Two-hand control on stand-alone machines.

Economical application across all phases of a project was our particular priority when developing this modern safety relay.