Conventional Operating Mechanism - Siemens SIRIUS 3RT Manual

Configuration
6.3 Operating mechanism system / coil selection 3RT contactors and 3RH2 contactor relays
6.3.2.1

Conventional operating mechanism

The conventional operating mechanism
The control supply voltage is run direct to the solenoid coil via terminals A1/A2, and the
contactor is switched on and off. After switching on, the solenoid operating mechanism is
switched from pick-up excitation to holder excitation (DC economy circuit) by an in-built
change-over contact.
Control supply voltage
The contactors are equipped with wide-range operating mechanisms and can thus cover a
wide range of control supply voltages, for example rated operating range (U
110 V ... 127 V or 220 V ... 240 V. In addition, both voltage types, AC as well as DC, are
covered by the same operating mechanism.
Operating range
The operating range is 0.8 x U
1.1 x 240 V.
72
- 1.1 x U , for the example, this means: 0.8 x 220 V -
s min s max
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
- U ) of
smin smax