The Siemens 3RH2431-1BM40 is a latched contactor relay from the Siemens SIRIUS 3RH2 series, designed for industrial control, switching, interlocking and automation applications. It features 3 normally open (NO) and 1 normally closed (NC) contacts, a 220 V DC coil and screw-terminal connections. Siemens documentation identifies this model as a Size S00 latched contactor relay.
The 3RH2431-1BM40 is designed for switching and controlling auxiliary and control circuits in industrial electrical systems.
Unlike a standard contactor relay, the latched design allows the relay to maintain its switching position without requiring continuous coil energization, making it useful in applications where the maintained switching state is important.
Typical applications include:
Industrial automation
Machine-control panels
Motor-control circuits
Electrical interlocking
Process-control systems
Production machinery
Auxiliary switching
OEM control panels
Industrial signalling systems
The complete control circuit should be designed according to the required latching and release operation.
The key characteristic of the 3RH2431-1BM40 is its latched operation.
A latched contactor relay is useful where the contact position needs to remain mechanically maintained after the initiating control action. This can help reduce the need for continuous coil energization for maintaining the contact state.
This type of relay can be useful in:
Maintained control functions
Sequential control
Switching applications
Industrial automation
Control-memory functions
Electrical control systems
Machine interlocking
The exact latch and release sequence must follow the manufacturer's control requirements.
The 3RH2431-1BM40 provides 3 normally open contacts and 1 normally closed contact.
This 3 NO + 1 NC arrangement provides flexibility for control and signalling circuits.
The contacts can be used for:
Auxiliary switching
Contactor status feedback
PLC inputs
Electrical interlocking
Control logic
Machine sequencing
Alarm and status signalling
Relay-control circuits
Siemens identifies this model as the 31E contact configuration, corresponding to three NO and one NC contact.
The 3RH2431-1BM40 uses a 220 V DC control coil. Siemens product documentation identifies the DC-rated control supply as 220 V for this article.
This makes the relay suitable for compatible DC control systems where the specified coil voltage is available.
The control supply must always be matched with the product marking before installation.
The product uses screw terminals, providing a conventional connection method for industrial control-panel wiring.
Screw terminals are familiar to panel builders and maintenance teams and can support practical wiring, commissioning and servicing when installed according to the applicable Siemens requirements.
The 3RH2431-1BM40 is a Size S00 contactor relay.
The compact S00 format is suitable for organized electrical control panels where space efficiency is important.
It can be integrated into:
Control cabinets
Automation panels
Machine-control stations
OEM equipment
Industrial relay panels
The Siemens 3RH2431-1BM40 can be integrated into industrial control systems where a maintained relay state and multiple auxiliary contacts are required.
The relay can be used for maintained control functions and machine sequencing.
Its auxiliary contacts can be incorporated into motor-control logic, interlocking and feedback circuits.
The contacts can provide suitable digital signals to PLC inputs or receive control signals through compatible interface circuits.
The latched operation can be useful where a switching state needs to remain maintained until a subsequent release action occurs.
Its compact S00 format and multiple auxiliary contacts make it suitable for standardized OEM control-panel designs.
The 3RH2431-1BM40 is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its combination of latched operation, 3 NO + 1 NC contact arrangement, 220 V DC coil and screw-terminal connections makes it suitable for industrial control applications requiring maintained switching states.
Siemens SIRIUS 3RH2 contactor relay
Article number 3RH2431-1BM40
Latched contactor relay
Size S00
3 NO + 1 NC contacts
220 V DC 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 contact state according to the relay's latching mechanism.
3 NO + 1 NC contacts: Provides multiple control and signalling paths.
220 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 and interlocking functions.
Automation integration: Suitable for industrial PLC and relay-control architectures.
OEM-friendly: Suitable for machine-control and panel-building applications.
The Siemens 3RH2431-1BM40 combines latched contactor-relay operation, 3 NO + 1 NC auxiliary contacts, 220 V DC control and screw-terminal connections in a compact S00 device.
It is particularly useful for industrial control systems where a maintained relay state is required without relying on continuous coil energization to hold that state.
For OEMs, panel builders and automation integrators, it provides a compact solution for control logic, interlocking, signalling and maintained switching applications.
SB Smart supplies Siemens industrial electrical and automation products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and all major cities across India.
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It is a Siemens SIRIUS 3RH2 latched contactor relay with 3 NO + 1 NC contacts, a 220 V DC coil and screw terminals.
It is a latched contactor relay.
It provides 3 normally open and 1 normally closed contacts.
The specified coil voltage is 220 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, control panels, machine-control systems, process equipment, OEM machinery 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 | 3RH2431-1BM40 |
| SKU | 3RH2431-1BM40 |
| 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 Voltage | 220V DC |
| Control Voltage Type | DC |
| Terminal Type | Screw Terminals |
| Rated Insulation Voltage (Ui) | 690 V |
| Rated Impulse Withstand Voltage (Uimp) | 6 kV |
| Operational Current AC-15 at 230V | 10 A |
| Operational Current AC-15 at 400V | 3 A |
| Maximum Operating Frequency | 10,000 Operations/Hour |
| Mechanical Endurance | Up to 5 Million Operations |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -55°C to +80°C |
| Mounting Type | DIN Rail / Panel Mount |
| Standards | IEC 60947-1, IEC 60947-4-1, IEC 60947-5-1 |
| Application | Control, Signaling, Automation & Interlocking |
| Product Family | Siemens SIRIUS Control Relays |
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