3RA6400-2CB42

The Siemens SIRIUS 3RA6400-2CB42 compact direct starter integrates a starter protector, contactor, and electronic overload relay. It features 690V withstand voltage, 1 to 4A adjustable overload, 1.5kW motor power at 400V, IO-Link communication support, spring-clamp wiring, IP20 protection, and is suitable for applications with limited control panel space.

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Siemens 3RA6400-2CB42 SIRIUS 3RA6 Compact Direct Starter IO-Link Spring Terminal

Product Positioning

The 3RA6400-2CB42 is a compact load-regenerative starter from the Siemens SIRIUS 3RA6 series. It integrates motor start protection, contactor switching, and electronic overload protection into a single module and supports IO-Link communication, making it suitable for direct start applications that require digital monitoring.

Core Product Advantages and Features

Three-in-one integrated design

A single module integrates a motor starter protector, contactor, and electronic overload relay, replacing the traditional multi-component configuration and saving panel space and wiring time.

IO-Link digital communication

It supports the IO-Link communication protocol, which can transmit operating current and diagnostic information to the upper control system in real time, thereby improving the visual management of the equipment.

Spring clip terminal

Both the main circuit and the control circuit use spring clip wiring, eliminating the need for screw fastening, improving wiring efficiency and reducing the risk of loosening.

Wide current adjustment range

Adjustable overload current setting from 1 to 4A covers motor power requirements for various voltage levels from 400V to 690V.

project	Specification
Product Type	SIRIUS 3RA6 Compact Direct Starter (DOL)
Rated insulation voltage	690 V AC
Current setting range	1–4 A
Motor power (400V)	1.5 kW
Motor power (690V)	3 kW
Control voltage	24 V DC
Wiring method	Spring clip (Push-in) terminal
Communication function	Supports IO-Link (COM2 protocol)
Protection level	IP20
Ambient temperature	-20°C to 60°C
Mechanical life	10 million operation cycles
Integrated functions	Motor starter protector + contactor + electronic overload relay

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