The type 8581 switching amplifier is used especially to amplify the switching voltage in railway power units. Technical data Dimensions WxHxD 60/70/110 mm Housing Polystyrene Attachment Two holes in accordance with DIN   43604 or a standard carrying rail in   accordance with DIN EN 50022 Type of protection Housing: IP 30; terminals: IP 20   (Electrical switching encapsulated up   to the terminals) Ambient temperature -20°C to +70°C Control voltage < DC 40 V (against minus = earthing   potential) no galvanic separation   from the operating voltage Control current approx. 30 mA DC Operating voltage DC 200 V - 900 V (max. limiting   value DC 1000 V) Power drawn approx. 3 W Operating voltage Light emitting diode (LED) green number   Switching state number Light emitting diode (LED) red Working current circuit Make-type  contact (zero-potential)   Switching voltage: max. DC 1000 V   Switching current: max. 3 A   Continuous current: max. 3 A   Switching rating: max. 50 W / VA Configuration Standard   extended   (for connection to operating hours   counter type 8001) Ordering information Type Part No. 8581 00 420100 8581 10 420101