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What are the advantages of the ZBPA, ZBP0 and ZBP0A clear pushbutton covers for the Harmony XB4 and XB5 range pushbutton switches?

The use of a clear pushbutton cover offers IP69K degree of protection, which provides resistance to:
  • Water ingress from high pressure washers (Karcher)
  • Salt spray 

Here is the list of cover part numbers:
  • ZBPA:    covers for flush pushbuttons with circular head
  • ZBP0:    covers for projecting pushbuttons with circular head
  • ZBP0A:  covers for flush or projecting pushbuttons with circular head for food & beverage applications
Caution:
A cover cannot be used with a legend holder.
Clear, round, self-adhesive legends are required (type ZBY1101).
Resistance to salt spray

Notes on IP69K

German standard DIN 40050-9 extends the IEC 60529 rating system described above with an IP69K rating for high-pressure, high-temperature wash-down applications. Such enclosures must not only be dust tight (IP6X), but also able to withstand high-pressure and steam cleaning.

The test specifies a spray nozzle that is fed with 80°C water at 810MPa (80100bar) and a flow rate of 1416L/min. The nozzle is held 105 cm from the tested device at angles of 0°, 30°, 60° and 90° for 30s each. The test device sits on a turntable that rotates once every 12s (5rpm).

The IP69K test specification was initially developed for road vehicles, especially those that need regular intensive cleaning (dump trucks, cement mixers, etc.), but also finds use in other areas (e.g., food industry, car wash centers).

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