The Siemens 3SE52120LK60 is a SIRIUS 3SE5 position switch designed for reliable mechanical position detection, limit monitoring, and machine-control applications. It features a metal enclosure according to EN 50047, a 31 mm device width, 1 × M20 × 1.5 device connection, and 1 NO + 2 NC quick-action contacts. The actuator is an adjustable-length twist lever with positive-fit grid-hole adjustment, adjustable for right- or left-hand operation, and equipped with a 19 mm plastic roller.
This configuration makes the switch suitable for machinery where a rotating or moving component needs to actuate a mechanical limit switch. The adjustable twist lever provides installation flexibility, while the combination of NO and NC contacts allows the position signal to be integrated into control, monitoring, sequencing, and suitable safety-related circuits.
The Siemens 3SE52120LK60 position switch is used to detect the position or movement of machine components.
When a moving component contacts the 19 mm plastic roller, the twist lever rotates and operates the internal switching mechanism. This produces an electrical signal that can be used by an appropriate control system.
The switch can be considered for applications such as:
The exact electrical and safety function depends on the complete machine architecture and application design.
The 3SE52120LK60 provides one normally open (NO) and two normally closed (NC) contacts.
This contact arrangement gives flexibility for connecting the switch to control, monitoring, and signaling circuits.
Potential applications include:
The contact arrangement should be integrated according to the electrical design and the specified ratings of the switch.
A major feature of the 3SE52120LK60 is its adjustable-length twist lever.
The lever can be mechanically adjusted to suit the required actuation position. Its positive-fit adjustment uses grid holes, helping provide a secure mechanical setting.
This is particularly useful when the distance between the position switch and the moving machine component varies.
The adjustable lever can help simplify installation in machinery where the actuator needs to reach a specific position or follow a particular movement path.
The twist lever is adjustable for right- or left-hand operation.
This provides additional flexibility during machine installation. Depending on the mechanical arrangement, the actuator can be positioned to accommodate the direction from which the moving machine component approaches the roller.
This can be particularly useful for:
Correct adjustment is important to ensure the roller is operated within the intended mechanical travel range.
The actuator incorporates a 19 mm plastic roller.
The roller provides a contact surface for the moving machine component and allows the actuator to respond to mechanical movement.
A roller-type actuator can be useful when the machine component moves across the actuator rather than directly pressing against a fixed plunger.
Typical applications include detecting:
The roller and lever should be correctly aligned with the moving component to avoid excessive side loading or unnecessary mechanical stress.
The 3SE52120LK60 uses a metal enclosure according to EN 50047.
The metal construction provides a robust housing suitable for industrial machinery and demanding mechanical applications.
The 31 mm format follows the standardized dimensions associated with the relevant EN 50047 position-switch design.
This makes the switch suitable for machinery where a rugged mechanical position-monitoring component is required.
The position switch features 1 × M20 × 1.5 device connection.
This provides a standardized cable-entry arrangement for industrial installation.
Correct cable glands, wiring methods, and installation accessories should be selected according to the required environmental protection and the complete machine installation.
The switch uses quick-action contacts, providing a defined and rapid transition of the electrical contacts when the actuator is operated.
This type of switching mechanism is useful for applications where the machine-control system requires a clear electrical response to mechanical movement.
The quick-action mechanism can support repetitive position-monitoring operations when the switch is used within its specified mechanical and electrical limits.
The Siemens 3SE52120LK60 position switch can be considered for:
For OEM machine manufacturers, the 3SE52120LK60 offers flexibility in mechanical installation.
The combination of a metal enclosure, adjustable-length twist lever, right/left adjustment, and 19 mm plastic roller makes the switch adaptable to different machine layouts.
The 1 NO + 2 NC contact configuration also provides multiple switching possibilities for machine-control and monitoring circuits.
The standardized position-switch construction makes the product suitable for industrial machine-control applications and replacement requirements.
The adjustable actuator can be particularly useful when replacing a switch where the machine's mechanical actuation point requires precise positioning.
For replacement applications, always verify the complete Siemens order number, actuator configuration, contact arrangement, enclosure type, connection, and mounting dimensions before ordering.
Position switches can form part of machine safety systems when appropriately selected and installed. However, the 3SE52120LK60 should not be considered a complete safety system by itself.
The overall safety function depends on the complete architecture, including:
The complete safety function should be appropriately designed, verified, and validated before commissioning.
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The 3SE52120LK60 is a Siemens SIRIUS 3SE5 position switch with a metal EN 50047 enclosure, 1 NO + 2 NC quick-action contacts, and an adjustable-length twist lever with a 19 mm plastic roller.
It provides 1 NO and 2 NC quick-action contacts.
It uses an adjustable-length twist lever with a 19 mm plastic roller.
Yes. The actuator is adjustable for right- or left-hand operation.
It has 1 × M20 × 1.5 device connection.
The metal enclosure is designed according to EN 50047.
The actuator has a 19 mm plastic roller.
It can be used for machine position monitoring, mechanical limit detection, conveyor systems, packaging machinery, machine tools, production equipment, and industrial automation applications.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SE5 |
| Model Number | 3SE5212-0LK60 |
| Variant | LK60 |
| Product Type | Safety Position Switch |
| Contact Configuration | 1NO + 2NC |
| Switching Function | Snap-action |
| Actuator Type | Adjustable twist lever with roller |
| Housing Material | Metal |
| Enclosure Standard | EN 50047 |
| Cable Entry | 1 × M20 × 1.5 |
| Rated Insulation Voltage | 400 V |
| Thermal Current | 10 A |
| AC-15 Rating | ~6 A (typical) |
| DC-13 Rating | ~3 A (typical) |
| Protection Class | IP66 / IP67 |
| Mechanical Life | ~15 million operations |
| Electrical Life | ~100,000 operations |
| Operating Temperature | -25°C to +85°C |
| Shock Resistance | 30 g / 11 ms |
| Vibration Resistance | 0.35 mm / 5 g |
| Repeat Accuracy | ~0.05 mm |
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