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The positive opening mechanism guarantees that these switches will always function even if the contacts have become welded due to a short-circuit or in the unlikely event of spring failure. This makes them also suitable for use in safety circuits.

Another characteristic is the fast motion of the contact bridge induced by the force of a pretensioned spring. This snap-action mechanism provides a maximum independence of contact making from operating speed - thus allowing for switching relatively high rated loads in spite of the small, compact design of the switches.

On the other hand they can also handle low currents and voltages due to their self-cleaning contacts as well as their protection against dust, moisture and pollutants, which results in high reliability even at low contact rating.

S847 series snap-action switches feature galvanically isolated, mechanically linked contact bridges which prevent circuit closing failures.

Standards:

• Performance according to IEC 60947-5-1, VDE 0660 part 200
• Positive opening operation. Mechanical form-locking feature according to IEC 60947-5-1 annex K, VDE 0660 part 200 annex K
• Protection degree IP 40, IP 60 and IP 67 according to IEC 60529, VDE 0470 part 1, DIN 40050-9
• Fire retardant according to UL 94V-0
• Dimensions according to DIN 41636-6, type F
• Flat quick-connect terminals according to DIN 46247-3

Applications:

• Limit switch for use on machines, door and plant controls
• Auxiliary switch in e.g. cam groups and control devices
• Electromechanical switching element for automation tasks with different electric loads
• Safety switch in control units and systems