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  1. lembede

    630 Amp contactor with SIL 2 trip classification

    I have a classified trip request signal from the emergency shutdown system to trip the main contactor in the thyristor control panel for a heater (435kW). The contactor has to be classified to SIL 2 according to IEC 61508, which means it must not fail to trip more than once in 1000 requests to...

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