The Siemens 3SB5400-0B contact block is a compact industrial switching component designed for compatible Siemens 3SB5 pushbuttons, switches and operator-control devices. It features 1 normally open (NO) contact, a screw terminal connection, and front plate mounting, making it suitable for machine-control panels, automation systems, electrical cabinets and industrial operator stations. The product description and configuration are also listed in current Siemens-related product documentation as “Contact block, 1 NO, screw terminal, front plate mounting.”
The 3SB5400-0B is useful when an operator action needs to provide a normally open switching signal to a control circuit. It can be incorporated into compatible 3SB5 assemblies for applications such as machine commands, auxiliary control, signalling, PLC inputs and other industrial control functions.
The Siemens 3SB5400-0B provides one normally open contact. In its normal state, the contact is open and closes when the associated operating device is actuated.
This simple contact arrangement makes the component useful for a wide range of industrial control requirements. Depending on the overall circuit design, the 1NO contact can be used for:
For example, when paired with a suitable pushbutton, pressing the button can close the NO contact and send a control signal to the relevant relay, contactor, PLC input or other control component.
The screw terminal connection provides a practical wiring method for electrical control panels and operator stations. It allows conductors to be securely terminated and provides convenient access during installation, testing, troubleshooting and maintenance.
For electrical panel builders, OEM machine manufacturers and industrial electricians, this type of connection can simplify control-panel wiring and servicing.
When installing the 3SB5400-0B, the connected circuit, conductor selection and termination method should be checked against the complete electrical design and applicable installation requirements.
The front plate mounting configuration allows the contact block to be integrated into compatible operator-control assemblies. It works as part of the rear-side switching arrangement of a suitable Siemens 3SB5 pushbutton or control device.
This modular approach allows panel builders to configure operator stations according to the required contact arrangement. Depending on the application, compatible 3SB5 components can be combined to provide the required NO and NC control functions.
The 3SB5400-0B is therefore useful when a machine-control panel requires a dedicated 1NO contact block for front plate mounting.
The 3SB5400-0B belongs to the Siemens 3SB5 control and signalling range. It is listed as a push-button accessory and is suitable for compatible pushbutton applications.
Using compatible Siemens contact blocks allows OEMs and panel builders to create flexible operator interfaces. A suitable contact configuration can be selected depending on whether the machine requires a normally open signal, normally closed signal or a combination of contact functions.
Before installation or replacement, compatibility with the selected 3SB5 actuator or operator device should always be confirmed.
The Siemens 3SB5400-0B 1NO contact block can be used in various industrial applications, including:
It is particularly suitable when an operator device requires one normally open switching contact for transmitting a control or auxiliary signal.
The Siemens 3SB5400-0B contact block is suitable for OEM machine manufacturers, electrical panel builders, automation integrators, electricians and industrial maintenance professionals.
For new installations, the contact block can be integrated into a compatible Siemens 3SB5 operator device according to the required control architecture. For replacement and maintenance applications, it can be considered where a compatible 1NO screw-terminal contact block with front plate mounting is required.
Its compact configuration makes it a practical choice for control panels where reliable operator-device integration and organized wiring are important.
The Siemens 3SB5400-0B contact block provides a practical 1NO switching solution with screw terminal connection and front plate mounting for compatible Siemens 3SB5 control and signalling applications.
The normally open contact can be used for machine commands, auxiliary switching, PLC signalling and other control functions. The screw-terminal design provides a familiar wiring solution, while the front plate mounting configuration allows integration into suitable operator-control assemblies.
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Siemens 3SB5400-0B is a 1 normally open (1NO) contact block with screw terminal connection and front plate mounting.
It provides one normally open contact (1NO).
NO means normally open. The contact remains open in its normal state and closes when the associated operating device is actuated.
It can be used for machine commands, auxiliary switching, PLC input signalling, relay control and other industrial control applications.
The contact block uses a screw terminal connection.
It is designed for front plate mounting within a compatible operator-control assembly.
It belongs to the Siemens 3SB5 control and signalling family.
Yes. It is designed for compatible Siemens 3SB5 pushbutton and control-device applications.
It can be used in machine-control panels, automation systems, motor-control panels, operator stations, PLC circuits and electrical cabinets.
You can explore the Siemens product range at SB Smart for compatible contact blocks, pushbuttons, switches and industrial automation products.
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Series | SIRIUS 3SB5 |
| Model Number | 3SB5400-0B |
| Product Type | Contact Block |
| Contact Configuration | 1 NO (Normally Open) |
| Mounting Type | Front Plate Mounting |
| Terminal Type | Screw Terminal |
| Suitable For | Push Buttons, Selector Switches, Key Actuators |
| Rated Operational Voltage | Up to 690 V AC |
| Rated Current | 10 A |
| Standard | IEC 60947-5-1 |
| Mechanical Life | High durability |
| Electrical Life | Long service life |
| Degree of Protection | IP20 (Terminal Side) |
| Mounting | Front Mounted |
| Application | Industrial Control & Automation |
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