sion MSC-DE, the electronic motor-protective circuit-breaker
PKE for motor currents up to 65 A offers an innovative alternative
to bimetal solutions (PKZM0). With its high-level of flexibility
and the same accessory components, the MSC-DE fulfils
the customer demands for exchangeable “standard“ devices.
Star-delta motor start
With a star-delta motor start, the start-up of the three-phase
asynchronous motor is implemented by a changeover of the
windings. The jumpers in the motor terminal box are omitted,
and all 6 winding connections are connected to the mains supply
using a so-called star-delta switch (manually actuated
switch or automatic contactor circuit).
During the operating connection, the windings of the motor are
connected in delta. The winding voltage (UW) must therefore be
equal to the phase voltage (ULN) of the three-phase system. For