The Siemens 3SE51220CE02 is a SIRIUS 3SE5 mechanical position switch designed for dependable machine position detection, limit monitoring, and industrial automation applications. It features a 56 mm wide metal enclosure, 3 × M20 × 1.5 device connections, and 1 NO + 1 NC quick-action contacts. The actuator is a metal roller lever with a 22 mm stainless steel roller, providing a durable mechanical interface for detecting movement and position in industrial machinery.
The combination of a robust metal enclosure, stainless steel roller, and quick-action contacts makes this configuration suitable for applications where the position switch is exposed to repeated mechanical actuation. It can be used for conveyor systems, machine tools, packaging equipment, production machinery, material-handling systems, and other industrial automation applications.
The Siemens 3SE51220CE02 position switch detects the position or movement of machine components.
When a moving component contacts the 22 mm stainless steel roller, the roller lever moves and operates the internal switching mechanism. The resulting electrical signal can be used for machine control, position indication, limit monitoring, sequencing, and suitable interlocking functions.
Typical applications include:
The 3SE51220CE02 provides one normally open (NO) and one normally closed (NC) quick-action contact.
This contact arrangement can be used to provide both switching and monitoring signals within a suitable machine-control circuit.
Possible applications include:
The quick-action mechanism provides a defined electrical switching response when the roller lever is actuated.
The contacts should be operated within their specified electrical ratings and according to the requirements of the complete control system.
A key feature of the 3SE51220CE02 is its 22 mm stainless steel roller.
The roller provides the mechanical contact surface between the moving machine component and the position switch.
The stainless steel construction is particularly useful where a durable roller surface is required for repeated mechanical contact.
The roller-lever configuration can be used when a machine component moves across the actuator rather than directly pressing against a fixed plunger.
Typical applications include:
Correct alignment is important to ensure smooth roller operation and avoid excessive mechanical loading.
The actuator uses a metal roller lever combined with the 22 mm stainless steel roller.
This provides a mechanical actuation arrangement suitable for industrial machinery where repeated operation is expected.
The roller lever allows a moving machine component to operate the position switch while passing across the roller.
This configuration can be especially useful for:
The 3SE51220CE02 has a 56 mm wide metal enclosure.
The metal housing provides a robust mechanical construction for industrial machine applications.
The wider enclosure accommodates the internal switching mechanism and the roller-lever actuator configuration.
This makes it suitable for machine installations where a larger industrial position-switch body is appropriate.
The position switch has 3 × M20 × 1.5 device connections.
Multiple connection points provide flexibility when routing cables into the position-switch enclosure.
Appropriate cable glands and wiring accessories should be selected according to the complete machine installation and environmental requirements.
Correct installation is important for maintaining reliable electrical connections and the intended environmental protection.
The 3SE51220CE02 uses quick-action contacts, providing a defined transition of the electrical contacts as the roller lever reaches the switching position.
This makes the switch suitable for repetitive mechanical position-monitoring applications.
The actuator should be operated within the specified mechanical travel range, and the electrical contacts should remain within their rated switching conditions.
The Siemens 3SE51220CE02 position switch can be used in:
For OEM machine manufacturers, the 3SE51220CE02 provides a durable mechanical position-detection solution.
The combination of a 56 mm metal enclosure, metal roller lever, 22 mm stainless steel roller, and 1 NO + 1 NC quick-action contacts provides a practical configuration for machinery requiring repeated mechanical actuation.
The roller design can simplify position detection where the moving machine component travels across the actuator.
For maintenance teams, the 3SE51220CE02 can be considered for replacement applications involving a metal-enclosure position switch with a roller lever.
Before replacing an existing position switch, verify:
Matching these characteristics helps ensure compatibility with the existing machine.
A mechanical position switch can form part of a machine safety system when appropriately selected and integrated. However, the 3SE51220CE02 is not a complete machine safety system by itself.
The complete safety function depends on the machine's overall safety architecture, including safety devices, safety relays or controllers, contactors, feedback circuits, protective measures, wiring, and risk assessment.
The complete safety function should be appropriately designed, verified, and validated before commissioning.
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Q1. What is Siemens 3SE51220CE02?
The 3SE51220CE02 is a Siemens SIRIUS 3SE5 mechanical position switch with a 56 mm wide metal enclosure, 3 × M20 × 1.5 connections, 1 NO + 1 NC quick-action contacts, and a metal roller lever with a 22 mm stainless steel roller.
Q2. What type of roller does it have?
It has a 22 mm stainless steel roller mounted on a metal roller lever.
Q3. How many contacts does it have?
It provides 1 NO + 1 NC quick-action contacts.
Q4. How wide is the enclosure?
The metal enclosure is 56 mm wide.
Q5. How many M20 × 1.5 connections are provided?
The switch has 3 × M20 × 1.5 device connections.
Q6. Where can it be used?
It can be used for machine position monitoring, conveyor systems, mechanical limit detection, packaging machinery, machine tools, production equipment, material handling, and industrial automation.
Q7. Why use a stainless steel roller?
A stainless steel roller provides a durable mechanical contact surface for repeated actuation in suitable industrial applications.
Q8. Is it suitable for replacement applications?
It can be considered for replacement applications when the enclosure, actuator, roller, contacts, connections, mounting arrangement, and electrical requirements match the existing switch.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SE5 |
| Model Number | 3SE5122-0CE02 |
| Variant | CE02 |
| Product Type | Safety Position Switch |
| Contact Configuration | 1NO + 1NC |
| Switching Function | Snap-Action |
| Positive Opening | Yes |
| Housing Material | Metal |
| Actuator Type | Roller Lever |
| Roller Material | Stainless Steel |
| Roller Diameter | 22 mm |
| Connection Type | Screw Terminals |
| Cable Entry | 3 × 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 | 100,000 Operations |
| Repeat Accuracy | 0.05 mm |
| Operating Temperature | -25°C to +85°C |
| Storage Temperature | -40°C to +90°C |
| Width | 56 mm |
| Length | 119 mm |
| Weight | Approx. 0.43 kg |
| Mounting Position | Any |
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