Models PSR-FSP/2x1 and PSR–FSP2/2x1 are safe interposing relays designed to operate with fail-safe controls in process applications. The former can be used in applications up to Safety Integrity Level (SIL) 3, and the latter can be used for up to a SIL 2 requirement, according to IEC 61508. The process safety relays have two normally open safe outputs. Both have a normally closed status contact that can be wired to a SIL-rated controller to perform an automated proof test.

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