Casing made from sea water resistant aluminium. Base frame manufactured from galvanised steel with integrated inlet cone. Integrated bird guard manufactured from powder coated, galvanised steel.
Voltage controllable external rotor motors, suspended vibration-free.
Radial impeller with backward curved blades manufactured from high-performance composite material, with highlyefficient, profiled 3-D blade geometry.
3 phase motors speed controllable via transformer, 2 speed via star-delta switching. Frequency converter controllable by using an all-pole sinusoidal filter. The single phase motors can be controlled by transformer / thyristor or can
be operated in 2 speeds via a two speed switch.
Integrated thermal contacts, up to size 311 with manual reset; from size 355 integrated thermal contacts with cables for connection to a motor protection switching device.