Siemens SIRIUS 3RW44 soft starter electronic motor control device

Product Item : 3RW44
Product Brand : Siemens
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Product Description
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The SIRIUS 3RW44 soft starter is an electronic motor control device for optimized starting and stopping of 3-phase asynchronous motors.The 3RW44 soft starter has two antiparallel thyristors in each of the phases.

There is one thyristor for the positive and one thyristor for the negative half wave.3RW44 soft starters are an alternative to star-delta starters and frequency converters.

The electronic 3RW44 soft starters are designed for normal starting. A model with a higher output may be necessary for heavy starting or for a higher starting frequency.

The technical parameters of Siemens SIRIUS 3RW44 soft starter are as follows:

Electrical parameters

Main circuit power voltage: 200V-690V, 50Hz-60Hz.

Applicable motor power: up to 710kW (400V) under standard wiring; up to 1200kW (400V) under internal delta wiring.

Rated current: varies with different models, e.g. 3RW4453-6BC44 has a rated current of 551A.

Control voltage: generally 230V AC.

Functional parameters

Starting mode: soft starting can be carried out by sudden pulse, torque control, voltage ramp, adjustable torque or current limiting function, and any combination of these functions.

Stopping mode: there are various soft stop modes such as free stop, soft stop, torque control pump soft stop, combined DC braking and so on.

Protection function: with electronic motor overload protection, equipment self-protection function, can prevent thermal overload of power unit thyristor; provide adjustable release level, and thermistor motor protection function; thyristor can be SITOR semiconductor fuse to provide short circuit protection.

Communication function: the optional PROFIBUS DP module allows the integration of the soft starter into the controller with the aid of communication functions, programmable control inputs and relay outputs.

Environmental parameters

Temperature: up to 60ºC (capacity reduction from 40ºC).

Relative humidity: 10% - 95%.

Installation altitude: up to 5000m, capacity reduction from 1000m.

Other parameters

Protection class: generally IP00.

Built-in bypass contactor: Built-in bypass contactor, after detecting the completion of motor soft start, the bypass contact will bypass the thyristor to reduce heat loss.