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Safety Relays with Integrated Diagnostics and LFT

Safety Relays—Triple Protection

If there is an emergency situation in a process plant, a quick response is needed. Sirens, warning lights, or active cooling systems must be activated safely in line with the "energized to safe" (ETS) procedure, while motor controls or emergency shut-down valves are switched off according to "deenergized to safe" (DTS). To ensure safe signal transfer, Pepperl+Fuchs is setting a new level of reliability with newly developed safety relays. With triple redundant switching contacts, the interface module from the tried-and-tested K-System provides reliable and safety-related activation and deactivation for applications in accordance with IEC61508 up to SIL 3.


Intelligent safety relays with 1oo3 architecture, diagnosis, and line fault transparency
Certification in accordance with ATEX/IECEx Zone 2 as well as UL
Identical input circuits for all devices from the entire portfolio
Immunity against test pulses from all common control panels


Increased Availability

Increased Availability

The new safety relays are based on a 1oo3 architecture (one-out-of-three) with triple redundant contacts. This ensures reliable switching on or off—even with two faulty contacts. Rely on high availability of the safety functions in your plant!
Minimum Test Effort

Minimum Test Effort

Thanks to the integrated diagnostic function, one of the three contacts is automatically checked during each switching operation. Repeating this process annually means that the interface module will be fully tested after three years with no further testing effort required—so you can benefit from integrated diagnostics of the switching capability.
Continuous Monitoring

Continuous Monitoring

With the line fault transparency (LFT), the safety relays enable constant monitoring of the signal line. Locate possible line faults on the field side and on the controller side without the need for additional wiring.
Unrestricted Compatibility

Unrestricted Compatibility

The safety relays are immune to test pulses from the control panel, which means they no longer trigger unintentional switching processes. In this way, the new interface modules are compatible with all common output cards. You can rely on trouble-free operation in your plant.

Reliable Operation with Diagnostics and Line Fault Transparency (LFT)

The new safety relays are based on a 1oo3 architecture with triple-redundant relays. Together with integrated diagnostics and line fault transparency, the safety relays are very reliable and simplify testing. In this video, learn more about these functionalities …

Modules with line fault transparency require less wiring in the field and greatly increase the level of safety. They do not only monitor switching signals, they also provide seamless monitoring of the cables on the field and control sides. Learn more about LFT ... 

In emergencies such as a fire in the engine room of a ship, a fast response is required: Sprinkler systems must be switched on and the fuel supply to the source of the fireswitched off. In this video, see how the new safety relays from Pepperl+Fuchs set a new standard in terms of reliability and safety thanks to their 1oo3 architecture …

1oo3 Architecture for Maximum Safety

The 1oo3 architecture—connected in series in DTS applications and in parallel in ETS applications—ensures maximum availability of the safety function after failure of up to two contacts. This provides a safety-relevant advantage compared to force-guided contacts: If a contact on a force-guided relay fails, this can merely be detected and the actuator is not switched on or off. Additional wiring for evaluation channels in the control panel—with the associated effort and costs—is required to feed back information on the position of the switching contact. The new safety relay with 1oo3 architecture thus ensures higher reliability while also featuring easier handling.

Intelligent Safety Relays with 1oo3 architecture and LFT

Safety Integrity Level (SIL)

As technical equipment can pose a safety risk to people, it is important to identify, quantify and reduce the resulting risks. Based on risk analysis methods, necessary risk reduction is determined.
A low SIL requirement (SIL 1) means that only a comparably low risk reduction is necessary, whereas a higher Safety Integrity Level (for example SIL 3) requires a greater degree of risk reduction. An assessment of a safety relevant system is therefore performed easier if the risk of failure of the relevant components is already known. For that purpose, Pepperl+Fuchs offers a large number of products with a SIL/PL assessment.

Safety Integrity Level

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Do you have questions about the safety relays, or do you want to receive more information? We are happy to help! Simply fill out the contact form to send us a message.