IEC 61511 - suitability of a contactor for a SIF
IEC 61511 - suitability of a contactor for a SIF
(OP)
Hi All
Basic question - what is the basis under which a power contactor is permitted to be used in a SIF to IEC 61508/IEC 61511
The standards require that all components used in the SIS are either certified to IEC 61508 or are determined to be proven in use.
Surely everyone who uses a power contactor in their SIS isn't making a proven in use justification?
Thanks
Michael
Basic question - what is the basis under which a power contactor is permitted to be used in a SIF to IEC 61508/IEC 61511
The standards require that all components used in the SIS are either certified to IEC 61508 or are determined to be proven in use.
Surely everyone who uses a power contactor in their SIS isn't making a proven in use justification?
Thanks
Michael
RE: IEC 61511 - suitability of a contactor for a SIF
But I think these contactors are very small...and maybe repurposed relays.
I would think you'd be able to calculate the reduction rate by using the MTBF of the contactor.
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This is normally the space where people post something insightful.
RE: IEC 61511 - suitability of a contactor for a SIF
Unfortunately it refers you to the awful IEC 13849 standard which replaced the altogther more usable EN 954 machinery safety standard.