It all began at TSL-ESCHA with the first PK push button in the mid-1980s. The Presskey push button is now available in a variety of designs. Its special feature: a one-piece housing design. The great advantage of this design is that the PK’s switching chamber is hermetically sealed. Its self-cleaning contacts and absence of moving parts make the push button wear and maintenance-free. These features are the basis for a long service life while facilitating trouble-free operation. And it keeps your costs down. As the Presskey front side has no gaps that could allow dust or water to penetrate, nothing grates or jams when the button is pressed. This allows you to use the PK push button in very different regions. For example, in regions with very frigid temperatures such as Scandinavia, Russia or Siberia, as the door opening push button is frost-proof. And thanks to being dustproof, the PK is also suitable for desert areas.

PK push buttons for every installation situation

The PK push button family offers the largest number of variations in TSL’s push button range. There are eight construction types alone. There are also various switching functions, LED colors and mounting rings, as well as a large selection of pictographs. This means that you can optimally adapt the push button to suit your vehicle and installation situation. We want to provide our customers with tailor-made products, and installation should be as simple as possible. Construction type 7 and 8 PK push buttons, for example, come with an integrated mounting aid. We have also developed a centering aid for you to protect against glass breakage caused by screws. An impact protector serves as a back side sealing element. The centering aid also facilitates mounting, which saves you time and money when installing the buttons.

The railway standard EN 14752 is complied with

Thanks to the PK Series’ modular structure, all available pictographs and tactile controls can be combined. Door opening push buttons PK23, PK28 and PKZ-028 comply with the EN 14752 standard for side entrance systems for railway vehicles. This means that the push button’s active operation surface has a minimum dimension of 30 millimeters. Touch surface and tactile symbols also protrude three millimeters and 0.5 millimeters respectively, which is especially helpful for visually impaired persons. The buttons also comply with the maximum switching force of 15 newtons required by the standard.

PK push button product highlights

  • Ample selection of different switching functions, touch surfaces, mounting rings, LED colors and pictographs
  • Sound signals and light signals are configurable by microcontroller
  • Coating resistant to graffiti remover (additional option)
  • Space-saving installation thanks to a mounting hole diameter of only 43 millimeters
  • Complies with the current standards for rail vehicles (TSI-PRM, EN 50155, EN 45545-2 and EN 61373); some models also comply with the EN 14752 standard
PK29-S Taster von TSL um die Tür zu öffnen oder zu schließen

The PK push buttons are versatile for use in rail vehicles and buses.

Switching principle
  • 4-point contact
  • Self-cleaning contacts
  • Integrated air-pressure compensation system (constant switching pressure under all environmental conditions)
Signaling
  • 12 individually configurable LED displays (high-end version): PK21, PK22, PK23, PK28, PK41 and PK-Z
  • 4 LED displays (economy version): PK25, PK26, PK27 and PK29
  • Luminous colors red, yellow, green
  • Orientation, confirmation or warning tones (individually parameterized)
  • Orientation tone and confirmation tone as continuous or intermittent tones max. 52 dB(A), depending on the installation
Environmental conditions
Switching cycles > 7 million
Operating temperature -40 … +80 °C
Degree of protection IP67
Electrical data
Nominal voltage 24 VDC, 36 VDC, 72 VDC, 110 VDC
Nominal current Up to 50 mA @ 24 VDC, depending on the version
Switching current Up to 400 mA, depending on the version
Switching function Normally open (NO), PNP or NPN

PK push button variants at a glance on the basis of construction types

PK28-S Türöffnungstaster TSL rot
  • Function one-sided
  • Installation from front side with standard mounting ring
  • Visible screws
  • Application area: wall panel or door element
Tastfläche PK21-25

PK21
Touch surface flat
Pictograph flat

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK21-25

PK25
Touch surface flat
Pictograph flat

PK25_4LED

4-LED standby signal

Tastfläche PK28-29

PK28
Touch surface raised
Pictograph tactile
EN 14752

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK28-29

PK29
Touch surface raised
Pictograph tactile

PK25_4LED

4-LED standby signal

PK29-s Türöffnungstaster TSL gelb
  • Function one-sided
  • Installation from front side with standard mounting ring
  • Screws concealed by additional cover ring
  • Cover ring with text printing and/or braille embossing
  • Application area: wall panel or door element
Tastfläche PK21-25

PK21 with insert ring
Touch surface flat
Pictograph flat

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK21-25

PK25 with insert ring
Touch surface flat
Pictograph flat

PK25_4LED

4-LED standby signal

Tastfläche PK28-29

PK28 with insert ring
Touch surface raised
Pictograph tactile
EN 14752

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK28-29

PK29 with insert ring
Touch surface raised
Pictograph tactile

PK25_4LED

4-LED standby signal

PK27-S Türöffnungstaster grau
  • Function one-sided
  • Installation from front side; stepped mounting ring
  • Screws concealed by additional cover caps
  • Application area: wall panel or door element
Tastfläche PK22-26

PK22
Touch surface flat
Pictograph flat

PK21_6led

6-LED standby signal plus 6-LED operation signal

PK23-27

PK23
Touch surface raised
Pictograph tactile
EN 14752

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK22-26

PK26
Touch surface flat
Pictograph flat

PK25_4LED

4-LED standby signal

PK23-27

PK27
Touch surface raised
Pictograph tactile

PK25_4LED

4-LED standby signal

PK41 Türöffnungstaster TSL orange
  • Function one-sided
  • Installation from front side with a screw connection pitch circle diameter of 76 mm; stepped mounting ring
  • Visible screws
  • Application area: wall panel or door element
PK23-27

PK41

Touch surface raised
Pictograph tactile

PK21_6led

6-LED standby signal plus 6-LED operation signal

Taster PKZ TSL-ESCHA
  • Function one-sided
  • Screwless installation from front side with Zentraflex mounting ring
  • Flush installation (reduces driving resistance and driving noise)
  • Pressure-tight thanks to Zentraflex mounting rings and closed switch housing
  • Ideal for usage in high-speed trains
  • Also suitable for mounting on emergency releases
Tastfläche PK21-25

PKZ-021

Touch surface flat
Pictograph flat

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK28-29

PKZ-028
Touch surface raised
Pictograph tactile

PK21_6led

6-LED standby signal plus 6-LED operation signal

Taster PK28 TSL-ESCHA
  • Function one-sided
  • Installation from front side with a mounting cutout diameter of 74 mm
  • Back wall mounting with mounting claws
  • Visible screws
  • Application area: wall panel or door element
Tastfläche PK21-25

PK21-5
Touch surface flat
Pictograph flat

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK21-25

PK25-5
Touch surface flat
Pictograph flat

PK25_4LED

4-LED standby signal

Tastfläche PK28-29

PK28-5
Touch surface raised
Pictograph tactile
EN 14752

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK28-29

PK29-5
Touch surface raised
Pictograph tactile

PK25_4LED

4-LED standby signal

PK2x Glaseinbau einseitig TSL-ESCHA
  • Function one-sided
  • Mounting of push button in the back side cover housing
  • Integrated mounting aid
  • Application area glass door
  • The following angles are available for adapting the housing to the door profile slope: 0°/6°/10°/15°/25°
  • Degree of protection IP67 (vehicle exterior)
  • Optional:
    • Screws concealed by additional cover ring
    • With text printing and/or braille embossing (see construction type 2)
Tastfläche PK21-25

PK21-3
Touch surface flat
Pictograph flat

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK21-25

PK25-3
Touch surface flat
Pictograph flat

PK25_4LED

4-LED standby signal

Tastfläche PK28-29

PK28-3
Touch surface raised
Pictograph tactile
EN 14752

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK28-29

PK29-3
Touch surface raised
Pictograph tactile

PK25_4LED

4-LED standby signal

  • Function double-sided
  • Mounting from front side in the back side cover housing
  • Integrated mounting aid
  • Visible screws
  • Application area glass door
  • The following angles are available for adapting the housing to the door profile slope: 0°/6°/10°/15°/25°
  • Degree of protection IP67 (vehicle exterior)
  • Optional:
    • Screws concealed by additional cover ring
    • With text printing and/or braille embossing (see construction type 2)
Tastfläche PK21-25

PK21-2
Touch surface flat
Pictograph flat

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK21-25

PK25-2
Touch surface flat
Pictograph flat

PK25_4LED

4-LED standby signal

Tastfläche PK28-29

PK28-2
Touch surface raised
Pictograph tactile
EN 14752

PK21_6led

6-LED standby signal plus 6-LED operation signal

Tastfläche PK28-29

PK29-2
Touch surface raised
Pictograph tactile

PK25_4LED

4-LED standby signal

Acoustic signals

Orientation tone

Confirmation tone

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