Siemens SIRIUS Soft Starter 3RW3034-1AB14

Description

Siemens SIRIUS Soft Starter 3RW3034-1AB14

The Siemens 3RW3034-1AB14 is a compact, two-phase controlled SIRIUS Soft Starter designed for the smooth starting of three-phase asynchronous motors. This specific model is often used to replace traditional Direct-on-Line (DOL) or Star-Delta starters to reduce mechanical stress.

Operating Principle: Two-Phase Control

The 3RW30 series uses two-phase control. While three-phase motors typically require control on all three phases, Siemens optimizes this unit by controlling two phases and bypassing the third. This reduces the size and heat generation of the unit while still effectively limiting the inrush current and torque during the startup phase.

Typical Wiring and Installation

• Main Circuit: Terminals L1, L2, L3 (Input) and T1, T2, T3 (Output to Motor).
• Control Circuit: Terminals A1, A2 for the supply voltage and an input for the start command.
• The 3RW30 does not include integrated electronic motor overload protection. You must install a separate thermal or electronic overload relay (like a SIRIUS 3RU or 3RB) to protect the motor from burnout.