Stahl - Catalog - STAHL - #451

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5 Fieldbus Technology 5/1 Automation 17.04.2008 10922E00 Ex i Field Device Coupler (4 Spurs) Series 9411/21 �œ For FOUNDATIONTM fieldbus H1 and Profibus PA, acc. to IEC 61158-2 �œ Connects up to 4 intrinsically safe FISCO field devices to a non-intrinsically safe / Ex e fieldbus �œ Isolation between intrinsically safe field devices and non-intrinsically safe fieldbus �œ 40 mA current each spur; spur protection �œ Low starting and low fault current by power management �œ Capacitive or direct earthing of cable screens �œ LED indication for status and faults on each spur �œ Switchable termination on board �œ Screw or cage clamp terminals �œ Customer specific enclosures available in different versions �œ Installation in – Zone 1 and Zone 2 – Zone 21 and Zone 22 – Class I Zones 1, 2 and Division 2 Zones 0 1 2 20 21 22 Ex i interfaces X X X X X X Installation in X X X X The Ex i Field Device Couplers connect intrinsically safe FOUNDATIONTM fieldbus H1 or Profibus PA field devices to a non-intrinsically safe / Ex e trunk. Up to four intrinsically safe FISCO spurs are powered with 40 mA each, adequate for one field device and an additional hand-held terminal. A feedback effect from the spurs on the trunk is prevented in the case of short-circuits current limiting (spur protection). The intrinsically safe spurs comply with FISCO specifications and are electrically isolated from the trunk. The Field Device Couplers feature a power management to minimise current from the trunk. The couplers are mounted on DIN rail or directly in enclosures made of glass fibre reinforced polyester or stainless steel. The cable shields can be connected to earth capacitively at the terminals or directly at the cable screen bus bar. An IP 30 cover protects the non-intrinsically safe connections of the trunk so that work can be carried out at any time on the intrinsically safe spurs.