Phoenix Contact's PRS safety relay modules for process technology are among the first safety products to be certified to SIL 3/IEC 61508.
Conventional safety relay modules can often exhibit a sufficiently high start-up current that the control system interprets this as a short circuit. The PSR-ESP safety relays provide optimised start-up behaviour, offering two safely isolated, redundant closers and one 22,5 mm-wide opener that can switch up to 250 V a.c. at 6 A. These are used to electrically isolate field applications from the control system or to adjust the voltage or power.
The international IEC 61508 standard is particularly relevant to electronic applications in the chemical, mechanical and process engineering fields. These compact safety relays, together with the safety-related controls and master system, form an integral part of the safety chain.
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