Siemens 3RW3037-1BB14 SIRIUS Soft Starter S2 63A 30kW 200-480V AC

The Siemens 3RW3037-1BB14 is a SIRIUS soft starter, size S2, rated at 63 A and 30 kW at 400 V / 40°C. It delivers controlled voltage ramp-up during motor starting via integrated thyristors across a 200-480 V AC main circuit range. A built-in bypass contact system takes over after run-up, eliminating thyristor losses during steady-state operation.

Technical specifications:

• MLFB: 3RW3037-1BB14
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Soft starter
• Size: S2
• Rated current: 63 A at 40°C / 58 A at 50°C / 53 A at 60°C
• Rated power (standard circuit): 30 kW at 400 V, 40°C; 18.5 kW at 230 V, 40°C
• UL rated power: 20 hp at 220/230 V; 40 hp at 460/480 V (50°C)
• Main circuit voltage: 200-480 V AC (-15% / +10%)
• Control supply voltage: 110-230 V AC/DC
• Operating frequency: 50-60 Hz
• Poles (main circuit): 3
• Auxiliary contacts: 1 NO
• Insulation voltage: 600 V
• Thyristor blocking voltage: 1600 V max
• Power loss at 40°C: 12 W
• Continuous operating current at 40°C: 115% of Ie
• Minimum load: 10%
• IP rating (front): IP20, finger-safe acc. to IEC 60529
• Degree of pollution: 3
• Ambient temperature (operation): -25 to +60°C
• Derating temperature: 40°C
• Installation altitude: up to 5000 m
• Dimensions (W x H x D): 55 x 160 x 170 mm
• Mounting: screw and snap-on
• Terminals (main and control): screw-type
• Main conductor range: solid 2x(1.5-16 mm²); finely stranded 1.5-25 mm²; stranded 1.5-35 mm²
• Maximum wire length: 300 m

Features and benefits:

• Integrated bypass contact system removes thyristors from the circuit after run-up, reducing heat dissipation in continuous operation
• Built-in thyristors provide smooth, controlled acceleration without external components
• Current capacity automatically derated across 40-60°C, enabling use in elevated ambient temperatures
• Finger-safe IP20 front protection acc. to IEC 60529
• Screw and snap-on mounting flexibility; mounting position tiltable +/-10° front and back
• Suitable for installations up to 5000 m above sea level

Applications:

• Soft starting of 3-phase AC motors up to 30 kW in industrial machinery
• Pump and fan drives requiring controlled ramp-up to reduce mechanical and electrical stress
• Conveyor and compressor systems needing smooth motor acceleration
• Motor control panels supplied with 110-230 V AC/DC control circuits

Compliant with IEC 60947-4-2 and IEC 60529. Part of the Siemens SIRIUS range.

Also known as: Siemens 3RW3037-1BB14, SIRIUS 3RW30 soft starter 63A, Siemens soft starter S2 30kW.