The Siemens 3SE52500BC058K is a SIRIUS 3SE5 mechanical position switch designed for reliable mechanical position detection, limit monitoring, and machine-control applications. It features a 30 mm plastic open-type enclosure, metal plunger, and 1 NO + 1 NC slow-action contacts, with an IP20 degree of protection. Siemens identifies the corresponding market-facing article as 3SE5250-0BC05.
This type of position switch converts mechanical movement into an electrical switching signal. It can be installed at a defined machine position so that a moving component actuates the metal plunger and changes the state of the connected contacts. The switch is suitable for applications involving machine sequencing, position confirmation, limit detection, and control interlocking.
The Siemens 3SE52500BC058K position switch is designed to detect the position or movement of mechanical machine components.
When a machine component reaches the specified position, it mechanically operates the metal plunger. The switch then changes the state of its 1 NO and 1 NC contacts, allowing the resulting signal to be incorporated into a suitable control or monitoring circuit.
Typical applications include:
The switch is also identified by Siemens as suitable for use as a safety switch, with positive opening functionality; however, the complete safety function must be designed and validated as a system.
Siemens documentation specifies the 30 mm enclosure width, plastic open-type construction, rounded metal plunger, and slow-action 1 NO + 1 NC configuration for this product.
The 3SE52500BC058K provides one normally open (NO) and one normally closed (NC) contact.
This combination gives the position switch flexibility for different machine-control and monitoring circuits.
The contacts can be incorporated into applications such as:
The electrical circuit should be designed according to the contact ratings and requirements of the complete control system.
The product uses a slow-action contact mechanism. Siemens documentation identifies the circuit principle as slow-action contacts.
With slow-action switching, the contact movement is directly related to the mechanical movement of the actuator. This makes the configuration suitable for applications where a straightforward mechanical relationship between machine movement and contact operation is required.
The slow-action design is available in Siemens' 3SE5 open-type position-switch range, which includes different contact configurations and actuator options.
The metal plunger provides direct mechanical actuation.
When the moving machine component contacts the plunger, the internal switching contacts change state. The metal plunger is designed for industrial mechanical actuation and can support applications where the switch is approached by a moving machine component.
Siemens documentation identifies the actuator as a rounded metal plunger and states that the switch head is designed according to EN 50047, design B.
The 3SE52500BC058K uses a 30 mm plastic open-type enclosure.
The compact design makes this type of switch useful where installation space is limited. Siemens' configuration documentation lists the 3SE5250 open-type design with a 30 × 48.5 × 20 mm overall dimensional format and identifies IP10/IP20 protection options within the range.
The product is specified with IP20 protection, with the applicable protection condition depending on proper conductor connection and terminal installation.
Therefore, the switch should be installed in an appropriately protected industrial environment. For applications involving direct water exposure, washdown, heavy dust, or other harsh environmental conditions, a position switch with an appropriate higher IP rating should be considered.
The Siemens 3SE52500BC058K position switch can be considered for:
For OEM machine manufacturers, the 3SE52500BC058K provides a compact mechanical position-monitoring solution.
Its metal plunger allows direct mechanical actuation, while the 1 NO + 1 NC slow-action contact configuration provides flexibility for connecting control and monitoring circuits.
The compact 30 mm open-type design can also be useful in machinery where installation space is restricted.
The conventional mechanical switching principle makes the device suitable for industrial control and replacement applications.
For replacement purposes, users should verify the complete product designation, actuator configuration, contact arrangement, enclosure design, protection rating, and mounting dimensions before ordering.
Siemens lists the corresponding 3SE5250-0BC05 product as an active product in its Industry Mall catalog.
Although Siemens documentation identifies this position switch as suitable for safety-switch applications and specifies positive opening, the switch itself should not be treated as a complete safety system.
The complete safety function depends on the overall machine architecture, including:
The complete safety function should be appropriately designed, verified, and validated before commissioning.
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The 3SE52500BC058K is a Siemens SIRIUS 3SE5 mechanical position switch with a 30 mm plastic open-type enclosure, metal plunger, and 1 NO + 1 NC slow-action contacts.
It has a rounded metal plunger actuator.
It provides 1 NO and 1 NC contact.
It uses slow-action contacts.
The specified protection rating is IP20.
The enclosure width is 30 mm.
It can be used for machine position monitoring, mechanical limit detection, machine sequencing, conveyor systems, packaging machinery, manufacturing equipment, and industrial automation applications.
Siemens identifies the product as suitable for use as a safety switch with positive-opening functionality. The complete safety function must nevertheless be designed and validated as part of the complete machine safety system.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SE5 |
| Model Number | 3SE5250-0BC05 |
| Variant | BC058K |
| Product Type | Safety Hinge Switch |
| Contact Configuration | 1NO + 1NC |
| Switching Function | Snap-action |
| Actuation Type | Hinge / rotary door movement |
| Housing Material | Plastic |
| Width | ~30 mm |
| Length | ~59 mm |
| Height | ~27 mm |
| Connection Type | Screw terminals |
| Cable Entry | M20 × 1.5 |
| Rated Insulation Voltage | 400 V |
| Thermal Current | 10 A |
| AC-15 Rating (230V) | ~1.5–6 A (depending configuration) |
| DC-13 Rating | Up to 3 A (24 V typical) |
| Protection Rating | IP20 |
| 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 |
| Safety Function | Positive opening (IEC 60947-5-1) |
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