The Siemens 3SE51120CA008K is a SIRIUS 3SE51 basic switch for position-switch applications, designed for reliable mechanical position detection, limit monitoring, and industrial machine-control applications. It features a metal enclosure according to EN 50041, 1 × M20 × 1.5 device connection, and 1 NO + 1 NC quick-action contacts. The product is supplied without an actuator head, allowing a compatible actuator to be selected separately according to the mechanical requirements of the machine. Siemens identifies the corresponding 3SE5112-0CA00 basic switch as an active SIRIUS product family component.
The modular design makes this basic switch suitable for OEM machine builders, panel builders, system integrators, and maintenance teams that require a flexible mechanical position-switch solution.
The 3SE51120CA008K acts as the switching base of a mechanical position-switch assembly. When a compatible actuator head is fitted and operated by a moving machine component, the internal contacts change state and provide an electrical signal for an appropriate control or monitoring circuit.
Typical applications include:
The corresponding Siemens 3SE5112-0CA00 configuration is specified with a 40 mm enclosure width according to EN 50041, and Siemens lists it as a basic switch with 1 NO/1 NC quick-action contacts without an actuator head.
The switch incorporates one normally open (NO) and one normally closed (NC) contact.
This arrangement can provide suitable switching and monitoring signals within machine-control circuits. The quick-action mechanism gives a defined contact transition when the compatible actuator operates the switch.
Potential uses include:
Siemens documentation for the corresponding basic switch identifies the switching principle as quick-action/snap-action contacts and confirms one NO and one NC contact.
A key feature of the 3SE51120CA008K is that it is supplied without an actuator head.
This gives machine builders flexibility to select an appropriate compatible actuator according to the mechanical arrangement.
Depending on the application, a suitable actuator may be configured for:
The actuator should be selected based on the required travel, actuation direction, mounting arrangement, and complete machine design. Compatibility with the specific 3SE51 basic switch should be confirmed before ordering.
The switch uses a metal enclosure designed according to EN 50041.
This standardized industrial design makes it suitable for position-switch assemblies used in machinery and automation systems. Siemens' product information identifies the enclosure family as 40 mm according to EN 50041 for the corresponding 3SE5112-0CA00 configuration.
The metal construction provides a robust housing for suitable industrial installations.
The 3SE51120CA008K has 1 × M20 × 1.5 device connection.
This provides a standard metric cable-entry arrangement for connecting the position-switch assembly to the machine's electrical wiring.
Suitable cable glands and wiring accessories should be selected according to the actual installation environment and required enclosure protection.
When combined with the correct compatible actuator, the basic switch can detect movement or position of machine components.
For example, an actuator may be mechanically operated when a conveyor reaches a particular point, when a machine component reaches an end position, or when a moving mechanism passes a defined location.
The switch can then provide an electrical signal to an appropriate control system.
This makes it suitable for:
The 3SE51 platform allows the basic switching component and mechanical actuator arrangement to be configured according to the application.
For OEM manufacturers, this modular approach can be useful when several machine variants require different actuator arrangements while retaining the same basic switching technology.
The 3SE51120CA008K therefore provides a flexible foundation for building a compatible position-switch assembly.
The Siemens basic switch can be considered for:
For OEM machine builders, the 3SE51120CA008K provides a standardized mechanical switching base that can be paired with a compatible actuator.
Its EN 50041 metal enclosure, M20 × 1.5 connection, and 1 NO + 1 NC quick-action contacts provide a practical configuration for industrial position-monitoring applications.
The absence of a fixed actuator also gives the machine designer more flexibility when developing the mechanical actuation arrangement.
The basic-switch format can be useful for replacement or maintenance where an existing 3SE51 position-switch assembly requires a compatible switching unit.
Before purchasing, check:
This is especially important when replacing only the basic switch rather than the complete position-switch assembly.
Siemens identifies the corresponding 3SE5112-0CA00 configuration as suitable for use as a safety switch and specifies positive opening for the relevant product configuration.
However, a position switch alone does not constitute a complete machine safety system. If it is used in a safety-related function, the complete safety architecture—including suitable safety controllers or relays, wiring, monitoring, protective devices, and risk assessment—must be appropriately designed and validated.
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The 3SE51120CA008K is a Siemens SIRIUS 3SE51 basic switch for position-switch applications, with an EN 50041 metal enclosure, 1 × M20 × 1.5 device connection, and 1 NO + 1 NC quick-action contacts.
No. It is supplied without an actuator head.
It has 1 NO + 1 NC quick-action contacts.
The basic switch is designed according to EN 50041.
It has 1 × M20 × 1.5 device connection.
Yes. Because the product is supplied without an actuator head, a compatible actuator can be selected according to the mechanical requirements of the 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.
Yes. Its modular basic-switch design is suitable for OEM machine builders and system integrators requiring a flexible position-switch configuration.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SE5 |
| Model Number | 3SE5112-0CA00-8K |
| Variant | CA008K |
| Product Type | Safety Position Switch |
| Contact Configuration | 1NO + 1NC |
| Switching Principle | Snap-Action |
| Positive Opening | Yes |
| Housing Material | Metal |
| Connection Type | Screw Terminals |
| Cable Entry | 1 × M20 × 1.5 |
| Rated Insulation Voltage | 400 V |
| Thermal Current | 10 A |
| Surge Voltage Resistance | 6 kV |
| Protection Rating | IP66 / IP67 |
| Mechanical Life | 15 Million Operations |
| Electrical Life (AC-15, 230V) | 100,000 Operations |
| Shock Resistance | 30 g / 11 ms |
| Vibration Resistance | 0.35 mm / 5 g |
| Repeat Accuracy | 0.05 mm |
| Operating Temperature | -25°C to +85°C |
| Storage Temperature | -40°C to +90°C |
| Width | 40 mm |
| Length | 85.7 mm |
| Mounting Position | Any |
| Brand | Siemens |
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