Siemens 3RW4038-2BB04 soft starter, SIRIUS soft starter S2 72 A, 37kW/400 V, 40 °C 200-480V AC, 24V AC/DC spring-type terminals.

General technical data 

Product brand name: SIRIUS 

Product designation: Soft starter 

Product feature 

● integrated bypass contact system Yes 

● thyristors Yes 

Product function 

● intrinsic device protection Yes 

● motor overload protection Yes

● evaluation of thermistor motor protection No

● external reset Yes 

● adjustable current limitation Yes 

● inside-delta circuit No 

Product component motor brake output No 

Insulation voltage rated value 600V  

Degree of pollution 3, acc. to IEC 60947-4-2 

Blocking voltage of the thyristor maximum 1600V  

Reference code according to EN 61346-2 Q 

Reference code according to DIN 40719 extended according to IEC 204-2 according to IEC 750 G

Power Electronics 

Operational current 

● at 40 °C rated value 72A  

● at 50 °C rated value 62A  

● at 60 °C rated value 60A  

Yielded mechanical performance for 3-phase motors 

● at 230 V 

— at standard circuit at 40 °C rated value 22kW  

● at 400 V 

— at standard circuit at 40 °C rated value 37kW

Yielded mechanical performance [hp] for 3-phase AC motor at 200/208 V at standard circuit at 50 °C rated value 20hp

Operating frequency rated value 50 ... 60Hz  

Relative negative tolerance of the operating frequency -10%  

Relative positive tolerance of the operating frequency 10% 

Operating voltage at standard circuit rated value 200 ... 480V 

Relative negative tolerance of the operating voltage at standard circuit -15%  

Relative positive tolerance of the operating voltage at standard circuit 10%  

Minimum load [%] 20% 

Adjustable motor current for motor overload protection minimum rated value 35A 

Continuous operating current [% of Ie] at 40 °C 115% 

Power loss [W] at operational current at 40 °C during operation typical 15W 

Control circuit/ Control

Type of voltage of the control supply voltage AC/DC

Control supply voltage frequency 1 rated value 50Hz 

Control supply voltage frequency 2 rated value 60Hz 

Relative negative tolerance of the control supply voltage frequency  -10%

Relative positive tolerance of the control supply voltage frequency 10% 

Control supply voltage 1 at AC at 50 Hz 24V

Control supply voltage 1 at AC at 60 Hz 24V 

Relative negative tolerance of the control supply voltage a AC at 50 Hz -15% 

Relative positive tolerance of the control supply voltage at AC at 50 Hz 10% 

Relative negative tolerance of the control supply voltage at AC at 60 Hz -15% 

Relative positive tolerance of the control supply voltage at AC at 60 Hz 10% 

Control supply voltage 1 at DC 24V

Relative negative tolerance of the control supply voltage at DC -20% 

Relative positive tolerance of the control supply voltage at DC 10% 

Display version for fault signal: red

Mechanical data

Size of engine control device: S2

Width: 55mm 

Height: 160mm 

Depth: 170mm 

Fastening method: screw and snap-on mounting

Mounting position: With additional fan: With vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back 

Without additional fan: With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° t

Required spacing with side-by-side mounting

● upwards: 60mm 

● at the side: 30mm 

● downwards: 40mm 

Wire length maximum: 300m 

Number of poles for main current circuit: 3

3RW40 soft starters product family:

3RW4024-1BB14

3RW4024-1BB15

3RW4024-1TB04

3RW4024-2BB05

3RW4024-1TB05 

3RW4024-2BB04

3RW4024-2TB05 

3RW4024-1BB04 

3RW4024-1BB05

3RW4026-1BB14

3RW4026-2BB15

3RW4026-2TB04

3RW4026-2TB05

3RW4026-1BB15

3RW4026-1TB04

3RW4026-1TB05

3RW4026-2BB04

3RW4026-2BB05

3RW4026-2BB14

3RW4026-1BB04

3RW4026-1BB05

3RW4038-1BB14

3RW4038-2BB04

3RW4038-1TB04

3RW4038-1TB05

3RW4038-2TB05

3RW4038-1BB04

3RW4038-2BB14

3RW4038-2BB15

3RW4038-2BB05

3RW4038-1BB15

3RW4038-2TB04

3RW4038-2BB04