Automatic Raise Arm Barriers offer l reliability, efficient operation and durability with a smooth consistent operation (single phase supply). Heavy duty roller plunger limit switches For use in residential & commercial applications, these barriers are controlled by a a Programmable Logic Controller, which can be programmed to suit any requirement. 100% duty cycle,Removable cast aluminium hood,Arm lengths up to 6.0 metres (plain pole), Single Phase 230V, 6amp supply, using inverter for 3 phase motor Motor & two stage gearbox direct drive, Inverter driven, Adjustable speed, acceleration and deceleration No springs required or counterweights, Manual override in case of power failure