Signal towers and stack lights

Signal towers and stack lights are important visual and auditory signaling devices for use in machines or in automation processes. The color or state of the signal tower indicates a certain command. Standard signal towers and signal columns are equipped with a buzzer. Auer Signal is a technology leader in the field of optical and acoustic signal devices such as signal towers, signal lights, buzzers, horns and sirens.

Modular signal towers and stack lights

Modular signal towers are available in several variants as surface mounted, wall and panel mounting versions. Optical, acoustic and optical-acoustic models are also available. Modular signal towers are available with corner mounting, tube mounting, floor mounting and wall mounting elements.  


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Signal towers -  ECOmodul - Auer Signal
Signal tower Modul Perfect PC7 - Auer signal

Highest signal tower - Modul Perfect - PC7

The Modul Perfect 70, or PC7 for short, is one of the most versatile signal towers. The signal tower is up to 6 times brighter than the competition and up to 13 times brighter than the previous model Modul-Signal 70. With 7 positions is the PC7 one of the most versatile signal towers. The unique, patented contact allows up to 7 positions thanks to 8 internal contacts. The upper module is even brighter than the standard light modules and has an extensive, hemispherical signal effect. The diffuser films can be placed effortlessly in each individual module, even at a later time. Read more about the Modul Perfect PC7.

The cost-effective M12 connector base

The M12 connector base is the perfect solution for applications where fast, simple and cost-effective installation of the signal tower a top priority is.

Features Modul Perfect PC7:

  • Very bright LEDs (42 Cd)
  • Voice output module for playing audio files
  • Resistant to temperatures from -30°C to +70°C
  • Protection class IP66


View Modul Perfect 70 | PC7 in the webshop

Signal tower Modul-Compete 50 - CT5 - Auer Signal

Signal tower Modul-Compete 50 - CT5

The Modul-Compete 50 - CT5 signal tower from Auer Signal is very competitive in price. The optimized signal tower CT5 has the same central contacts as the PC7, but has been developed exclusively for classic industrial 24 V DC applications. For standard applications where high quality and an attractive price are required, the CT5 is the right choice. Read more about the CT5 signal tower.

Features Modul Compete 50:

  • Cost-effective modular 50 mm Ø signal tower for classic 24 V DC applications in industry
  • Up to 5 positions possible
  • Low pollution due to flat smooth design on the outside
  • Protection class IP65


View Modul Compete 50 - CT5 in the webshop

Modular stack lights with LED

Modular signal lamps and signal towers make is possible to see and hear the status of a specific machine or technical installation from a distance. Modular signal towers can be equipped with optical, acoustic and optical-acoustic signaling modules. The ECOmodul signal tower from Auer Signal has many different mounting options, so you can assemble the signal tower exactly as you wish. 

ECOmodul signal tower

The ECOmodul signal tower uses very bright LED technology. The modular signal tower is equipped with optical modules and a buzzer for acoustic safety functions. The connection is very simple, namely via a spring pressure of push0in technology. View ECOmodul signal towers.


  • Powerful LED modules, continuous, blink or flash light
  • Very long life, vibration resistant and lower energy consumption
  • Modular signal towers 40, 60 and 70 mm
  • Buzzer and alarm modules  


View modular signal towers and read specifications

Modular signal towers ECOmodul - Auer Signal
Modular signal tower Half-Dome - Auer Signal

Signal tower for wall mounting - Half-Dome

The modular signal tower Half-Dome for wall mounting from Auer Signal is a high-quality signal tower for universal applications, such as installation on walls or directly on the machine. With a high protection class of IP65, the Half-Dome signal tower is suitable for both indoor and outdoor usage.

180° viewing angle

The signal tower has a special lens optic with a reflective coating for optical signaling and visibility from any viewing angle (180°). The modular signal tower has a maximum of six modules, five LED modules and one buzzer (70-90 dB) in the upper enclosure area. Read more about the modular signal tower Half Dome from Auer Signal.


  • 180 ° viewing angle
  • Individually adjustable sound pressure (70-90 dB)
  • SPS fit
  • 12 VAC / DC, 24 VAC / DC, 110/120 VAC and 230/240 VAC
  • Certified according to UL type 4 / 4X / 13


View HalfDome signal towers in the webshop

The smallest signal tower series

The ECOmodul 40-series of Auer signal with a diameter of 40 mm is the smallest modular signal tower series in the world. Only the Ø 40 mm signal tower of the ECOmodul series is available with an LED multi strobe or multi color strobe.

Put your own signal tower together

You can choose from pre-assembled towers or you can put together your own signal tower with both optical and acoustic modules (80 dB). The 40 series can withstand temperatures of -30 °C and + 60 °C. The signal tower has a maximum of 5 modules or 10 modules using a double bracket.


  • User-friendly connection technology
  • PLC-fitting
  • IP66 degree of protection
  • UL type 4 / 4X / 13
  • Extensive range of mounting types

The ECOmodul signal towers are available with different diameters: 40 mm, 60 mm and 70 mm. 


diameter: 40 mm diameter: 60 mm diameter: 70 mm


Signal tower ECOmodul Small size - Auer Signal