The Siemens 3SE51220CA00 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 56 mm wide metal enclosure, 3 × M20 × 1.5 device connections, and 1 NO + 1 NC quick-action contacts. This version is supplied without an actuator head, providing flexibility to select a compatible actuator separately according to the mechanical requirements of the machine.
The Siemens 3SE51220CA00 is particularly suitable for OEM machine builders, panel builders, system integrators, and maintenance teams that require a modular mechanical position-switch solution. The basic switch provides the electrical switching mechanism, while a suitable compatible actuator can be selected based on the machine's movement, travel, and installation arrangement.
The 3SE51220CA00 basic switch forms the switching component of a mechanical position-switch assembly.
It is designed to detect mechanical movement or position when used with a compatible actuator head. Depending on the selected actuator, the complete position-switch arrangement can be adapted to different machine configurations.
The electrical switching signal can be used for:
The 3SE51220CA00 provides one normally open (NO) and one normally closed (NC) quick-action contact.
This configuration can provide suitable switching and monitoring signals within a machine-control circuit.
The contacts may be used for:
The quick-action contact mechanism provides a defined transition when the compatible actuator operates the switching mechanism.
The electrical contacts should be used within their specified ratings and in accordance with the complete control-system design.
A defining characteristic of the 3SE51220CA00 is that it is supplied without an actuator head.
This gives machine builders flexibility to select a suitable compatible actuator separately.
Depending on the mechanical application, an appropriate actuator configuration may be required for:
This modular arrangement can be useful for OEMs designing different machine configurations around a common basic switch.
Actuator compatibility should always be verified using the applicable Siemens product documentation before assembly or ordering.
The basic switch uses a 56 mm wide metal enclosure.
The metal housing provides a robust mechanical construction for suitable industrial machinery and machine-control applications.
The 56 mm format accommodates the switching mechanism and the associated connection arrangement.
This makes the product suitable where a larger and durable metal position-switch body is required.
The 3SE51220CA00 provides 3 × M20 × 1.5 device connections.
Multiple cable-entry points can provide flexibility for wiring and installation.
Suitable cable glands and connection accessories should be selected based on the machine installation and environmental requirements.
Proper installation is essential for maintaining reliable electrical connections and the intended environmental protection.
The quick-action contacts provide a defined electrical switching response when the compatible actuator operates the basic switch.
This makes the 3SE51 basic switch suitable for repetitive position-detection and limit-monitoring applications.
The actuator and switching mechanism should be operated within the specified mechanical travel and electrical limits.
The 3SE51220CA00 is useful when a modular position-switch configuration is required.
Instead of purchasing a complete position switch with a fixed actuator, the basic switch can be combined with an appropriate compatible actuator according to the machine design.
This provides flexibility for applications involving different:
For OEM machine manufacturers, this can help standardize the electrical switching platform while allowing the mechanical actuator arrangement to vary.
The Siemens 3SE51220CA00 basic switch can be used in:
For OEM machine builders, the 3SE51220CA00 provides a flexible basic switching platform.
The combination of a 56 mm metal enclosure, 1 NO + 1 NC quick-action contacts, and 3 × M20 × 1.5 connections provides a practical foundation for position-switch assemblies.
Because the product is supplied without an actuator head, the machine builder can select the compatible actuator that best suits the machine's mechanical arrangement.
This is useful when multiple machine models require different actuator configurations while using the same basic switching unit.
The basic-switch configuration can also be useful for maintenance and replacement requirements where compatible 3SE51 components are already installed.
Before ordering a replacement, check:
This helps ensure that the selected component matches the existing position-switch system.
A mechanical position switch can form part of a machine safety system when correctly selected and integrated. However, the 3SE51220CA00 is not a complete machine safety system by itself.
The overall safety function depends on the complete safety architecture, including suitable safety switches, safety relays or controllers, contactors, feedback circuits, protective devices, wiring, and the machine risk assessment.
The complete safety function should be appropriately designed, verified, and validated before commissioning.
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The 3SE51220CA00 is a Siemens SIRIUS 3SE51 basic switch for position-switch applications with a 56 mm metal enclosure, 3 × M20 × 1.5 device connections, and 1 NO + 1 NC quick-action contacts.
No. The 3SE51220CA00 is supplied without an actuator head.
It has 1 NO + 1 NC quick-action contacts.
The metal enclosure is 56 mm wide.
It has 3 × M20 × 1.5 device connections.
Yes, the basic-switch concept allows an appropriate compatible actuator head to be selected for the required position-switch configuration. Compatibility should be verified before installation.
It can be used for machine position monitoring, mechanical limit detection, conveyors, packaging machines, machine tools, production equipment, material handling, and industrial automation.
A basic switch without an actuator provides greater configuration flexibility, allowing the compatible actuator arrangement to be selected according to the machine's mechanical requirements.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SE5 |
| Model Number | 3SE5122-0CA00 |
| Variant | CA00 |
| Product Type | Safety Position Switch |
| Contact Configuration | 1NO + 1NC |
| Switching Principle | Snap-Action |
| Positive Opening Contact | Yes |
| Housing Material | Die-Cast Metal |
| Connection Type | Screw Terminals |
| Cable Entry | M20 × 1.5 |
| Rated Insulation Voltage | 400 V |
| Rated Thermal Current | 10 A |
| Protection Rating | IP66 / IP67 |
| Mechanical Life | Up to 15 Million Operations |
| Electrical Life | Up to 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. 0.30 kg |
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