The PK52 stands out within the Presskey family in terms of its external features alone: an extremely large touch surface, very good lateral recognition of the status display and an acoustic orientation signal. These are just a few examples that facilitate registration of TSL-ESCHA’s PK52 push buttons and greatly simplify safe operation. Braille and self-explanatory pictographs also support tactile and visual recognition. The improved operational characteristics are particularly helpful for passengers with reduced mobility in buses and trains.

The individual needs of door manufacturers and vehicle operators were also taken into account during development. The PK52 can implement almost all functions and special requirements regarding light and sound signals, as the integrated micro controller makes the functions parameterizable. It is possible to display different light patterns that, for example, help passengers with red-green weakness perceive the light signals. First three red LEDs light up and then three green LEDs at another position. A 4:2 change is also possible, as is the hourglass effect. EN 14752 is fulfilled thanks to this change of position and color. The PK52 also meets the other criteria stipulated by this standard. Various switching functions allow the customer-specific combination of products.

PK52 complies with the durable contrast requirement

PK52’s stainless steel front panel conceals the screws. This offers considerable advantages in many areas, such as preventing unauthorized persons from dismantling the push buttons. The powder-coated panel is available in various RAL colors so it can be harmonized with the vehicle design. The powder coating is particularly durable, thus helping the push button to maintain its good appearance and ensuring a lasting contrast. The EN 16584 standard is thus durably fulfilled.

The pictographs of the PK52 push button series are protected against scratches. An optionally available surface coating can be used to protect the push button panel against UV radiation and make it environmentally compatible.

TSL-ESCHA offers the push button in the following versions: PK52 (freely selectable parameters, with sound signal from 900 Hz to 5 kHz, 24 to 110 VDC), PK52 Standard (with sound signal from 2 to 5 kHz, 24 VDC) and PK52 Eco (without sound signal, 12 to 24 VDC). The PK52 can also be used as an emergency button, for example in lavatories, by combining it with a triangular plate. The TSL push button thus complies with the EN 16683 standard.

PK52 push button product highlights

  • Large active touch surface (Ø52 mm)
  • Invisible fastening elements, enhanced protection against manipulation by unauthorized persons
  • Solid stainless steel front panel
  • Versatile parameter setting thanks to integrated micro controller (not for all variants)
  • Tactile switching feel
  • Variant with potential-free output
  • Proven chemical resistance to many surface cleaners
  • Can be mounted from the front side and comes equipped with a cable outlet for optional plugs
  • Complies with the current standards for rail vehicles (TSI-PRM, EN 14752, EN 50155, EN 45545-2 and EN 61373)
  • Complies with the “durability of contrast” requirement according to the EN 16584-2 standard
  • Coating resistant to graffiti remover for touch surface (optional)
TSL-ESCHA’s PK52 door opening push button
PK52 Türöffnungstaster rot/grün
Masszeichnung PKM52 TSL-ESCHA
Montageausschnitt PKM52 TSL-ESCHA
Switching principle
  • 3-point contact thanks to three micro buttons
  • Tactile switching and tactile surfaces
  • Operating force complies with TSI-PRM and EN 14752
  • 6 LED displays
  • LED displays can be controlled in groups
  • Orientation, confirmation or warning tones (individually parameterized)
  • Orientation tone and confirmation tone as continuous or intermittent tones max. 53 dB(A)
Environmental conditions
Switching cycles > 7 million
Operating temperature -40 … +80 °C
Degree of protection IP67
Luminous colors Red, yellow, green
Electrical data
Nominal voltage 12 … 110 VDC
Nominal current 50 mA @ 24 VDC, 110 mA @ 24 VDC with sound
Switching current Max. 200 mA, depending on the version
Switching function Normally open (NO), PNP or NPN, potential-free variant available
Acoustic signals

Orientation tone

Confirmation tone

A special tool supplied by TSL is required for disassembly of the PK52 push button. This protects the door opening push button against manipulation by unauthorized persons. Watch the video and see how to easily remove the front ring.