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Home Articles Schaltbau snap-action switches – technical features

Schaltbau snap-action switches – technical features

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Schaltbau snap-action switches – technical features

Snap-action switches are designed with a snap mechanism that allows extremely fast switching, practically regardless of the duration of actuation. This makes the operating position precisely reproducible and controls the arc more efficiently.

Snap-action switches from Schaltbau are designed for industrial applications that place high demands on the reliability of both components and systems. They can switch both control currents and loads reliably and precisely. They are capable of doing so up to 10 million times, depending on the series.


Special features of Schaltbau snap-action switches:

  • Double interruption: distribution of the switching-off task to two contacts
  • High electrical switching capacity and long-term load
  • High changeover speed
  • Short bounce times (from 1.7 to 3.5 ms, depending on series)
  • Snap-action system and electrical contact system decoupled
  • Self-cleaning contact system
  • Mechanical working life of up to 10 million operating cycles
  • Reliable opening of the break contacts due to positive opening operation
  • Flat, compact design, lateral mounting possible
  • Versions with higher degree of protection up to IP 67
  • High vibration and shock resistance
  • Transparent housing for inspecting the contacts


Decoupling of mechanical and electrical elements
The mechanical snap-action system and the electrical contact system are constructed separately in many series: this keeps the current heat that arises from impairing the mechanical spring characteristics of the snap mechanism.

Self-cleaning contacts

We achieve high contact reliability by using V-shaped contacts and due to the friction motion between the contacts. Thanks to this self-cleaning feature, the contact resistance of the switch remains constant throughout its entire working life (important for low currents).

Double interruption

In the case of double interruption, as opposed to single interruption, the voltage is distributed between two fixed contacts. This makes it possible to connect higher voltages and power outputs with the same contact distance. Switches with the double interruption feature have a longer electrical working life and greater contact reliability at the same time.

Galvanic separation

In the case of double interruption with galvanic separation, the two electrical circuits are insulated from each other by the mechanical design. This enables break and make contacts to switch various electrical circuits at the same time (for example load and control current).

Two safety circuits can be opened synchronously with our S850 double break contact.

Positive opening operation

For an opening contact element, positive opening operation ensures that the closed circuit is opened reliably even if the contacts become welded together or the springs break.




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