The Siemens 3SE51220BA00 is a SIRIUS 3SE51 basic switch for position-switch applications, designed for industrial machinery, mechanical position detection, limit monitoring, and automation systems. It features a 56 mm wide metal enclosure, 3 × M20 × 1.5 device connections, and is supplied without an actuator head.
The basic-switch configuration provides flexibility for machine builders and system integrators who need to select a compatible actuator separately according to the mechanical movement and installation requirements of the application. It can be used as the switching base for a suitable 3SE51 position-switch assembly in industrial control and automation applications.
The 3SE51220BA00 is used as the basic switching element in a mechanical position-switch system. When combined with an appropriate compatible actuator head, it can detect the movement or position of a machine component and provide an electrical switching signal to a suitable control circuit.
Typical applications include:
The Siemens 3SE51220BA00 uses a 56 mm wide metal enclosure designed for industrial position-switch applications.
The metal housing provides a robust mechanical construction suitable for appropriate industrial machinery and equipment. The 56 mm format provides space for the switching mechanism and connection arrangement while maintaining a standardized position-switch design.
This makes the basic switch suitable for machine builders who require a durable metal switch body and intend to configure the actuator separately.
The switch provides 3 × M20 × 1.5 device connections.
Multiple connection points offer installation flexibility when routing cables into the position-switch enclosure.
Appropriate cable glands and wiring accessories should be selected according to the machine's wiring configuration and environmental requirements.
Correct cable entry and installation practices are important for maintaining reliable connections and the required protection of the installed assembly.
The 3SE51220BA00 is supplied without an actuator head.
This is an important feature for OEM machine builders because the actuator can be selected separately according to the mechanical requirements of the machine.
Depending on the application, a compatible actuator arrangement may be selected for:
The appropriate actuator should be selected based on the required direction of movement, mechanical travel, mounting arrangement, and machine design.
Always verify actuator compatibility with the exact Siemens 3SE51 basic switch before ordering or installation.
The basic-switch design provides flexibility compared with a complete position switch that already has a fixed actuator.
With the 3SE51220BA00, the switch body can be incorporated into a compatible position-switch assembly and paired with an appropriate actuator configuration.
This can be useful for OEMs that manufacture different machine variants requiring different mechanical actuator arrangements while maintaining a common switching platform.
For example, different machine designs may require:
The exact compatible actuator must be confirmed before assembly.
The Siemens 3SE51220BA00 basic switch can be used in:
For OEM machine manufacturers, the 3SE51220BA00 provides a flexible foundation for mechanical position-switch assemblies.
The combination of a 56 mm metal enclosure and 3 × M20 × 1.5 device connections provides a practical configuration for industrial machine installations.
Because it is supplied without an actuator head, the machine builder has greater freedom to choose an appropriate compatible actuator based on the machine's mechanical arrangement.
This can help standardize the basic switch across different machine models while allowing the actuator arrangement to change according to the application.
The 3SE51220BA00 can also be useful in maintenance applications where a compatible 3SE51 basic switch is required.
Before selecting it as a replacement, verify:
This is particularly important when replacing only the switch body rather than a complete position-switch assembly.
A mechanical position switch can be incorporated into a machine safety function when correctly selected and integrated, but the 3SE51220BA00 itself is not a complete safety system.
Where the switch forms part of a safety-related function, the complete machine safety architecture should include appropriate safety components, control devices, monitoring, wiring, and protective measures.
The complete safety function should be designed, verified, and validated according to the applicable machine-safety requirements.
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The 3SE51220BA00 is a Siemens SIRIUS 3SE51 basic switch for position-switch applications with a 56 mm wide metal enclosure and 3 × M20 × 1.5 device connections.
No. This model is supplied without an actuator head.
The switch has a 56 mm wide metal enclosure.
It has 3 × M20 × 1.5 device connections.
The actuator is supplied separately to provide configuration flexibility, allowing a suitable compatible actuator to be selected according to the machine's mechanical requirements.
It can be used for machine position monitoring, mechanical limit detection, conveyors, packaging machinery, machine tools, production equipment, material handling, and industrial automation.
Yes, the modular basic-switch design can be useful for OEM machine builders and system integrators that need flexibility in actuator selection.
Check the 3SE51 series compatibility, actuator type, mechanical travel, mounting arrangement, switching requirements, and the applicable Siemens product documentation.
| Specification | Details |
|---|---|
| Product Name | Safety Position Switch |
| Part Number | 3SE5122-0BA00 |
| SKU | 3SE5122-0BA00 |
| Brand | Siemens |
| Product Family | SIRIUS Safety Series |
| Product Type | Safety Position Switch |
| Variant | BA00 |
| Application | Machine Safety & Position Monitoring |
| Function | Position Detection and Safety Switching |
| Installation Environment | Industrial Automation Systems |
| Usage | Machine Guards, Doors, Gates & Moving Equipment |
| Safety Integration | Machine Protection Circuits |
| Industrial Applications | Manufacturing, Packaging, Conveying & Automation |
| Construction | Industrial Grade |
| Manufacturer | Siemens |
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