That matters for panels with long DC runs or shared supplies where voltage drop eats into the headroom. It's rated for an I2t of 0.8 A²·s, which governs the thermal stress the device can handle during a start cycle; keep your motor's starting profile under that curve or you'll trip the overload before the motor gets up to speed. The part lives in an IP20 enclosure — fine for a clean control cabinet, but it won't survive washdown or outdoor dust.
Siemens 3RB2025-2SB0 SIRIUS Soft Starter, 24 V DC, MODBUS TC
MPN3RB2025-2SB0
Siemens SIRIUS 3RB2025-2SB0 soft starter, 24 V DC control supply, MODBUS TCP/IP, cULus, CE, IP20, 110 x 100 x 75 mm.
Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Width | 110 mm |
| Height | 100 mm |
| Depth | 75 mm |
Product details
Frequently asked questions
What compliance documentation does this part carry?
It carries cULus and CE mark approvals, which cover North American and European regulatory acceptance.
What is the DCP and FBD support on this part?
DCP (Data Communication Processor) and FBD (Function Block Diagram) are both supported, allowing onboard logic and direct Ethernet communication without a separate gateway.
MPN
3RB2025-2SB0