The Siemens 3SE51120BA00 is a SIRIUS 3SE51 basic switch for position-switch applications, designed for industrial machinery, machine-position monitoring, mechanical limit detection, and position-dependent control systems. It features a metal enclosure according to EN 50041, 1 × M20 × 1.5 device connection, and 1 NO + 1 NC slow-action contacts. The product is supplied without an actuator head, allowing a suitable compatible actuator to be selected separately according to the machine's mechanical requirements. Siemens lists 3SE51120BA00 as an active product in its Industry Mall.
The modular construction of this Siemens 3SE51 basic switch makes it particularly useful for OEM machine builders, system integrators, panel builders, automation engineers, and maintenance teams looking for a configurable industrial position-switch solution.
The 3SE51120BA00 basic switch functions as the switching unit within a mechanical position-switch assembly. When a compatible actuator head is installed and operated by a moving machine component, the switch can provide an electrical signal to the relevant control or monitoring circuit.
It can be used for:
The Siemens product description specifically identifies this model as a basic switch for position switch 3SE51, with a metal enclosure, EN 50041 design, M20 × 1.5 connection, 1 NO/1 NC slow-action contacts, and no actuator head.
Siemens identifies the corresponding product family as having a 40 mm enclosure width according to EN 50041.
The 3SE51120BA00 provides one normally open (NO) and one normally closed (NC) contact using a slow-action switching principle.
The slow-action mechanism allows the contact movement to correspond more directly to the mechanical movement of the actuator. This can be useful where the machine-control circuit requires a predictable switching relationship with the physical movement of the monitored component.
The contacts can be used for applications such as:
The available product data confirms 1 NC and 1 NO contact, with a mechanical slow-action switching principle.
An important feature of the 3SE51120BA00 is that it is supplied without an actuator head.
This allows the machine designer to choose a compatible actuator according to the actual mechanical arrangement of the equipment.
Depending on the application, a suitable actuator configuration may be selected for:
The correct actuator should be selected according to the required direction of movement, mechanical travel, mounting arrangement, and switching requirements.
Always verify actuator compatibility with the exact Siemens 3SE51 basic switch before ordering or installation.
The 3SE51120BA00 uses a metal enclosure designed according to EN 50041.
The corresponding Siemens product information specifies the product family as a 40 mm enclosure according to EN 50041.
The metal construction provides a robust housing suitable for appropriate industrial machinery and position-switch installations.
The standardized enclosure design makes the product suitable for machine builders who need a compact industrial position-switch body with a modular actuator arrangement.
The switch incorporates 1 × M20 × 1.5 device connection.
This provides a standard metric cable-entry arrangement for connecting the switch to the machine's electrical wiring.
Suitable cable glands and wiring accessories should be selected according to the installation environment and required protection level.
For the corresponding product configuration, published product information identifies IP66/IP67 protection, a 400 V insulation voltage, and a 6 kV surge-voltage resistance.
The slow-action contact mechanism is designed so that the contact movement follows the mechanical movement of the actuator.
This makes the configuration suitable for applications where position detection needs to correspond closely with the mechanical movement of the machine component.
Typical applications include:
The complete switching behavior depends on the selected actuator and the mechanical arrangement of the position-switch assembly.
The 3SE51 position-switch system uses a modular approach that allows different components to be combined for different machine requirements.
The 3SE51120BA00 provides the basic switching unit, while the actuator head can be selected separately.
This approach can be particularly beneficial for OEMs because different machine variants may require different mechanical actuator arrangements while retaining the same basic switch.
For example, one machine may require a roller actuator while another may require a lever or plunger configuration.
The Siemens 3SE51120BA00 basic switch can be considered for:
The modular design is particularly useful where mechanical position detection needs to be integrated into a machine-control system.
For OEM machine manufacturers, the 3SE51120BA00 offers a flexible foundation for creating compatible position-switch assemblies.
The combination of a metal EN 50041 enclosure, 1 × M20 × 1.5 connection, and 1 NO + 1 NC slow-action contacts provides a practical configuration for industrial position-monitoring applications.
Because the product does not include a fixed actuator head, the machine builder can select an appropriate compatible actuator according to the machine's physical layout.
This can simplify standardization when several machine models use the same basic switch but require different actuator configurations.
The 3SE51120BA00 can also be useful for maintenance and replacement of compatible 3SE51 position-switch assemblies.
Before selecting this product as a replacement, verify:
This is especially important when replacing only the basic switch rather than the complete position-switch assembly.
The corresponding Siemens product data specifies an IP66/IP67 protection class, 30 g / 11 ms shock resistance, 0.35 mm / 5 g vibration resistance, and a typical mechanical service life of 15 million operating cycles. The published data also gives an operating temperature range of -25 °C to +85 °C.
These characteristics make the product suitable for appropriately designed industrial installations where mechanical position switching is required.
The corresponding Siemens documentation identifies the product as suitable for use as a safety switch and specifies a positive-opening function.
However, the 3SE51120BA00 alone does not constitute a complete machine safety system. If it is used as part of a safety-related function, the complete safety architecture—including suitable safety relays or controllers, wiring, monitoring, protective devices, and machine risk assessment—must be correctly designed, verified, and validated.
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The 3SE51120BA00 is a Siemens SIRIUS 3SE51 basic switch for position-switch applications with a metal EN 50041 enclosure, 1 × M20 × 1.5 connection, and 1 NO + 1 NC slow-action contacts.
No. The product is supplied without an actuator head.
It has 1 NO + 1 NC slow-action contacts.
It uses a metal enclosure according to EN 50041, with the corresponding product family specified as 40 mm wide.
It has 1 × M20 × 1.5 device connection.
With slow-action contacts, the contact movement follows the mechanical actuator movement more directly. A quick-action mechanism instead produces a defined snap-action transition.
Yes. Since the product is supplied without an actuator head, a compatible actuator can be selected according to the mechanical requirements of the complete position-switch application.
It can be used for machine position monitoring, mechanical limit detection, conveyors, packaging machinery, machine tools, production equipment, material handling, and industrial automation.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SE5 |
| Model Number | 3SE5112-0BA00 |
| Variant | BA00 |
| Product Type | Basic Position Switch |
| Housing Material | Metal |
| Contact Configuration | 1NO + 1NC |
| Switching Function | Slow-Action |
| Positive Opening | Yes |
| Connection Type | Screw Terminals |
| Cable Entry | 1 × M20 × 1.5 |
| Protection Class | IP66 / IP67 |
| Rated Insulation Voltage | 400 V |
| AC-15 Rating at 24 V | 6 A |
| AC-15 Rating at 125 V | 6 A |
| AC-15 Rating at 230 V | 3 A |
| DC-13 Rating at 24 V | 3 A |
| DC-13 Rating at 125 V | 0.55 A |
| Mechanical Life | 15 Million Operations |
| Electrical Life | 100,000 Operations |
| Operating Temperature | -25°C to +85°C |
| Storage Temperature | -40°C to +90°C |
| Shock Resistance | 30 g / 11 ms |
| Vibration Resistance | 0.35 mm / 5 g |
| Mounting Standard | EN 50041 |
| Weight | Approx. 0.25 kg |
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