Siemens 3RW3018-1BB04 Soft Starter

The Siemens 3RW3018-1BB04 soft starters reduce the motor voltage through variable phase control and increase it in ramp-like mode from a selectable starting voltage up to mains voltage. During starting, these devices limit the torque as well as the current and prevent the shocks which arise during direct starts or wye-delta starts. In this way, mechanical loads and mains voltage dips can be reliably reduced.Soft starting reduces the stress on the connected equipment and results in lower wear and therefore longer periods of trouble free production. The selectable start value means that the soft starters can be adjusted individually to the requirements of the application in question and unlike wye-delta starters are not restricted to two-stage starting with fixed voltage ratios.The Siemens 3RW3018-1BB04 soft starters are characterized above all by their small space requirements. Integrated bypass contacts mean that minimal power loss is used at the power semiconductors (thyristors) after the motor has started up. This cuts down on heat losses, enabling a more compact design and making external bypass circuits superfluous.

Model: 3RW3018-1BB04
Rated Operational Current (Ie): 18 A
Rated Voltage: 380–480 V AC, 3-phase
Control Voltage: 24–230 V AC/DC
Motor Power Range: Up to 5.5 kW
Overload Protection: Integrated thermal and electronic overload monitoring
Operating Temperature: -25°C to +60°C
Communication Capability: Can interface with Siemens PLCs via standard industrial protocols
Mounting Type: DIN rail or panel mounting

• Smooth start and stop to reduce mechanical stress on motors and drive systems
• Integrated overload and short-circuit protection to enhance safety and reliability
• Compact, space-saving design for easy integration into existing control panels
• Adjustable starting torque and ramp-up times for tailored motor control
• LED indicators for status monitoring and fault diagnostics

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