The Siemens 3RH2431-1BB40 is a latched contactor relay from the Siemens SIRIUS 3RH2 series, designed for industrial control, automation, switching, interlocking and signalling applications. It features 3 normally open (NO) and 1 normally closed (NC) contacts, a 24 V DC control coil, and screw-terminal connections. Siemens identifies this article as a Size S00 latched contactor relay.
Note: The product specification provided says “AC Coil,” but the exact Siemens article 3RH2431-1BB40 is a 24 V DC coil version, not an AC-coil version.
The 3RH2431-1BB40 is part of the Siemens SIRIUS 3RH2 contactor relay family, used for switching auxiliary and control circuits in industrial electrical systems.
Its compact design and multiple auxiliary contacts make it suitable for control panels where relay-based switching and maintained operating states are required.
Typical applications include:
Industrial automation
Machine-control panels
Motor-control circuits
Electrical interlocking
Process-control systems
Auxiliary switching
Production machinery
OEM control panels
Industrial signalling systems
The key characteristic of the 3RH2431-1BB40 is its latched operation.
A latched contactor relay maintains its switching state through its latching mechanism rather than requiring continuous energization of the coil simply to maintain the contact position.
This can be useful for:
Maintained control functions
Sequential machine control
Switching-memory applications
Electrical control systems
Auxiliary circuits
Automation sequences
The exact latching and release operation should be implemented according to the Siemens wiring instructions and the requirements of the complete control system.
The 3RH2431-1BB40 provides 3 normally open contacts and 1 normally closed contact.
The 3 NO + 1 NC arrangement provides multiple switching paths for control and signalling applications.
These contacts can be used for:
Auxiliary switching
Contactor-status feedback
PLC inputs
Electrical interlocking
Machine sequencing
Control logic
Alarm and status signalling
Relay-control circuits
Siemens identifies the 3RH2431 configuration as a 31E contact arrangement, corresponding to three NO and one NC contact.
The exact 3RH2431-1BB40 article uses a 24 V DC control supply. Siemens' current product data specifies DC control voltage with a rated value of 24 V.
This makes the relay suitable for compatible 24 V DC control circuits used in industrial automation and control panels.
The control voltage should always be matched with the product marking and the electrical requirements of the installation.
The 3RH2431-1BB40 uses screw-terminal connections, providing a conventional and familiar method for industrial control-panel wiring.
Screw terminals are suitable for panel builders and maintenance teams and support practical installation and servicing when connected according to the manufacturer's requirements.
The 3RH2431-1BB40 is a Size S00 contactor relay.
Its compact form factor is suitable for electrical cabinets and machine-control panels where space-efficient installation is important.
It can be incorporated into:
Control cabinets
Automation panels
Machine-control stations
OEM equipment
Relay-control assemblies
The Siemens 3RH2431-1BB40 can be integrated into industrial control systems where a maintained switching state and multiple auxiliary contacts are required.
The latched relay can support maintained control functions and machine sequences.
Its auxiliary contacts can be used for motor-control logic, feedback and interlocking.
The contacts can be connected to suitable PLC inputs and control circuits where the electrical ratings are compatible.
The maintained contact state can be useful in control sequences where a condition needs to remain active until a subsequent switching action occurs.
Its compact S00 design and 3 NO + 1 NC contact configuration make it suitable for standardized OEM control-panel layouts.
The 3RH2431-1BB40 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its combination of latched operation, 3 NO + 1 NC contacts, 24 V DC coil and screw terminals makes it suitable for industrial control applications requiring a maintained switching state.
Siemens SIRIUS 3RH2 contactor relay
Article number 3RH2431-1BB40
Latched contactor relay
Size S00
3 NO + 1 NC contacts
24 V DC control coil
Screw terminals
Suitable for auxiliary switching
Suitable for electrical interlocking
Suitable for PLC feedback
Suitable for machine-control applications
Suitable for industrial automation
Suitable for OEM control panels
Latched operation: Maintains the selected contact state according to the relay's latching mechanism.
3 NO + 1 NC contacts: Provides multiple control and signalling paths.
24 V DC coil: Suitable for compatible DC control systems.
Screw terminals: Provides a familiar industrial wiring method.
Compact S00 design: Helps optimize control-panel space.
Flexible control logic: Supports switching, feedback, signalling and interlocking.
Automation integration: Suitable for PLC and relay-control architectures.
OEM-friendly: Suitable for industrial machine-control and panel-building applications.
The Siemens 3RH2431-1BB40 combines latched contactor-relay operation, 3 NO + 1 NC contacts, 24 V DC control and screw-terminal connections in a compact S00 device.
It is suitable for applications where a maintained switching state is required for control logic, sequencing, interlocking or automation functions.
For OEMs, panel builders and automation integrators, it provides a practical solution for auxiliary control, signalling and maintained switching applications.
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It is a Siemens SIRIUS 3RH2 latched contactor relay with 3 NO + 1 NC contacts, a 24 V DC coil and screw terminals.
The exact 3RH2431-1BB40 uses a 24 V DC coil. It is not an AC-coil version.
It provides 3 normally open and 1 normally closed contacts.
The specified control voltage is 24 V DC.
It is a Size S00 device.
Yes. The product is specified with screw-terminal connections.
It is used where a maintained switching state is required for control, sequencing, interlocking or automation functions.
Yes. Its auxiliary contacts can be incorporated into suitable PLC feedback and control circuits, provided the electrical ratings are compatible.
It can be used in industrial automation, machine-control systems, process equipment, OEM control panels and auxiliary switching applications.
You can explore the Siemens product range at SB Smart for Siemens contactor relays, auxiliary contact blocks, contactors and other industrial automation products.
| Specification | Details |
|---|---|
| Product Name | Latched Contactor Relay |
| Manufacturer | Siemens |
| Brand | Siemens |
| Series | SIRIUS 3RH2 |
| Model Number | 3RH2431-1BB40 |
| SKU | 3RH2431-1BB40 |
| Product Type | Auxiliary Contactor Relay |
| Relay Type | Latched Contactor Relay |
| Frame Size | S00 |
| Contact Configuration | 3NO + 1NC |
| Number of Normally Open Contacts | 3 |
| Number of Normally Closed Contacts | 1 |
| Coil Type | AC Coil |
| Connection Technology | Screw Terminals |
| Mounting Type | DIN Rail / Panel Mount |
| Rated Insulation Voltage (Ui) | 690 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Protection Class | IP20 |
| Mechanical Durability | Up to 10 Million Operations |
| Electrical Durability | Industrial Duty Rated |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -55°C to +80°C |
| Standards Compliance | IEC 60947-4-1, IEC 60947-5-1 |
| Expandable with Auxiliary Contacts | Yes |
| Compatible Accessories | Auxiliary Contact Blocks, Surge Suppressors |
| Applications | Control, Signaling, Interlocking & Automation |
| Product Family | Siemens SIRIUS Control Relays |
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