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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RW3038-1BB04 |
| Alternative Part Number | 3RW30381BB04 |
| Manufacturer | Siemens |
| Type | Soft Starter |
| Phase | 3 Phase |
| Rated Current at 40 °C | 72 A |
| Operating Frequency | 50 … 60 Hz |
| Operating Voltage | 200 … 480 V AC |
| Control Voltage | 24 V AC/DC |
| Power Loss at 40 °C | Typical 15 W |
| Width | 55 mm |
| Height | 160 mm |
| Depth | 170 mm |
| Mounting Position | Vertical mounting capable of +/-10° rotation or inclination |
| Installation Altitude | Up to 5,000 m above sea level |
| Cable Length (max) | 300 m |
| Number of Poles | 3 for main circuit |
| Screw Terminal Connections | For both main and auxiliary/control circuits |
| Ambient Operating Temperature | -25 … +60 °C |
| Storage Temperature | -40 … +80 °C |
| Degree of Protection | IP00 |
| Mechanical Size | S2 |
The Siemens 3RW3038-1BB04 soft starter is a compact and efficient solution designed to mitigate the mechanical and electrical stress on motor startups. This soft starter is part of the SIRIUS product range and is engineered to handle three-phase motors with a rated operational current of 72 A at 40°C, making it suitable for a variety of industrial applications.
With a power rating of 37 kW at 400V, this device is capable of managing significant loads while maintaining a small footprint, measuring just 55 x 169 x 160 mm. The soft starter operates within a voltage range of 200-480V AC and is compatible with both AC and DC control supply voltages of 24V, providing flexibility in integration with existing systems.
The unit features an integrated bridging contact system and thyristors, which contribute to its reliable performance. However, it does not include intrinsic device protection, motor overload protection, or the ability to evaluate thermal resistor motor protection, which allows for a more straightforward and focused operation.
This soft starter is designed for straightforward screw terminal connections, ensuring ease of installation and maintenance. It is also characterised by its robust construction, capable of operating in a wide range of environmental temperatures from -25 to +60°C, making it a versatile choice for challenging industrial environments.
The Siemens 3RW3038-1BB04 is a practical choice for those seeking to enhance the startup performance of their motors, reduce electrical peaks, and extend the lifespan of their motor-driven equipment.
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Frequently Asked Questions
What is the purpose of a soft starter?
A soft starter is designed to reduce the inrush current and torque of electric motors during startup. This helps in reducing mechanical stress on the motor and the electrodynamic stresses on the power cables and electrical distribution network, extending the lifespan of the system.
Can this soft starter be used with three-phase motors?
Yes, the Siemens soft starter is suitable for use with three-phase motors, providing efficient control during the start and stop operation.
What are the voltage requirements for this soft starter?
The soft starter operates within a voltage range of 200 to 480 V AC, making it versatile for various industrial applications.
Is there an integrated bypass contact system in this soft starter?
Yes, the soft starter comes with an integrated bypass contact system, which helps to reduce power loss and heat generation once the motor reaches full speed.
What is the rated operational current of this soft starter?
The rated operational current of the soft starter is 72 A at 40°C, ensuring it can handle significant motor loads.
Does this soft starter offer motor overload protection?
No, intrinsic motor overload protection is not a feature of this soft starter. Separate protection devices should be used to safeguard the motor from overload conditions.
What are the dimensions of this soft starter?
The dimensions of the soft starter are 55 mm in width, 160 mm in height, and 170 mm in depth, which should be considered when planning installation space.
How can I control this soft starter?
The soft starter can be controlled using a 24 V AC/DC control voltage, providing flexibility in integration with control systems.
What is the frequency range for the operation of this soft starter?
The soft starter operates at a frequency range of 50 to 60 Hz, accommodating standard industrial power supply frequencies.
Can this soft starter be used at different altitudes?
Yes, it can be used at altitudes up to 5,000 meters above sea level, though derating factors may apply at higher altitudes.
Part conditions explained
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