The Siemens 3RW4028-1BB04 soft starter is designed for motor power up to 18.5 kW at 400 V and nominal current of 38 A at 480 V. This device facilitates smooth motor start-ups and reduces mechanical stress in applications such as pumps, fans, and conveyors. Ideal for industrial settings, it enhances equipment lifespan by mitigating power surges and mechanical wear.
Type |
Soft starter |
Degree of protection (IP) |
IP20 |
Depth |
155mm |
Dim |
(W x H x D) 45 x 125 x 155 mm |
Function |
Single direction |
Height |
125mm |
Integrated motor overload protection |
TRUE |
Manufacturer part # |
3RW40281BB04 |
Max. temperature |
+60°C |
Min. temperature |
-25°C |
Misc Attribute 1 |
Screw connector |
Misc Attribute 2 |
3RW4028-1BB04 |
Motor power at 400 V |
18.5kW |
Nominal current |
38A |
Nominal current - rounded value |
38A |
Nominal voltage |
480V |
Rated operation current Ie at 40 °C Tu |
38A |
Rated power three-phase motor, inline, at 230 V |
11kW |
Rated power three-phase motor, inline, at 400 V |
18.5kW |
Rated surrounding temperature without derating |
40°C |
Release class |
Other |
Voltage type for actuating |
AC/DC |
Weight |
0.74 |
Width |
45mm |
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