Stack lights & andon lights

We offer two different types of tower lights: modular and pre-configured. The modular signal tower offers optimum flexibility and a large selection of modules, while the pre-configured stack light consists of just one article number and is ready configured for immediate use. Both options can be adapted exactly to the needs of your company. Our andon lights are available in diameters from 30mm to 70mm. You can configure the columns individually from the lines PC7, CT5, ECO, HD, MT60C30 as well as MS50 or choose a pre-assembled stack light.

Overview stack lights & andon lights


40 mm Ø50 mmØ60 mm Ø70 mm Ø


Our signal tower flagship PC7 meets the highest demands. The PC7 is the right choice when a future-proof, high-performance stack light with many flexible options is needed.

PC7 signal tower


The cost-optimised CT5 has the same central contacting as the PC7, but was developed exclusively for 24V DC operation. For standard applications where high quality and an attractive price are required, the CT5 is the right choice.

CT5 signal tower


The standard tower light series Eco is still equipped with classic contacting with metal pins, but also offers a complete product range in LED and incandescent lamp technology in three sizes.

ECO40 signal towerECO60 signal towerECO70 signal tower


30 mm Ø60 mm ØSemi-circular Design,
90 mm Ø


Cost-efficient signal tower MT60 with monolithic single lens in size Ø 60 mm. Available in various mounting versions and with optional sound element.

MT60 signal tower


The ready-to-use LED signal tower is offered pre-configured or built to customer specifications and is available in the size Ø 30 mm. Perfect for large quantities. Very attractive price-performance ratio.

signal tower C30


Visual-audible LED signal tower in a semi-circular design for wall mounting. Optimal signalling due to 180 degree beam angle.

signal tower HD
An engineering masterpiece

An engineering masterpiece

Our modular stack lights and andon lights are produced with unrivalled precision; the signal modules boast the lowest tolerance levels. Developed and built for many years of problem-free use in the industry.

Boost my light

IO-Link for andon lights CT5 and PC7

The new PC7MC5IO and PC7BLVIO base modules as well as CT5MC5IO and CT5KR1IO enable the implementation of our PC7 and CT5 signal towers into IO-Link communication systems.

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IO-Link stack light
All sizes available

All sizes available

Stack lights in all sizes

We produce towers lights for every application and in every common size: Ø 30 mm, Ø 40 mm, Ø 50 mm, Ø 60 mm and Ø 70 mm.

Design and flexibility

Design and flexibility

HD - The Design Tower

Visual-audible LED design stack lights & andon lights in a semi-circular design for wall mounting. Provides consistently optimal signalling due to 180 degree beam angle. Flexibility thanks to freely selectable colour combinations.

For large quantities

For large quantities

C30 - The Readymade

The pre-assembled, pre-wired and ready-to-use LED tower light is manufactured according to customer requirements. Ideal if a large quantities of andon lights are required with a very attractive price-performance ratio.

A diverse array of mounting types

A diverse array of mounting types

Every mounting type is possible

We have the right mounting solution, regardless of where the stack light is to be mounted. Our quick mounting system saves electrical installation work and makes mounting extremely easy.

Stack lights: versatile

Tower lights are indispensable in mechanical engineering and plant construction. But LED stack lights can also be found in many other areas such as logistics facilities and building services engineering. We pay particular attention to quality, performance, flexibility and reliability in the design and production of stack lights. Andon lights from Auer Signal are therefore characterised by the highest quality and particularly high luminosity.

One product, many different terms

Many different synonyms for stack lights highlight their diverse applications and variations across industries. Whether referred to as andon lights, tower lights or signal tower, which emphasizes their tall and prominent structure, these terms all refer to the same versatile and valuable signaling device used in industrial environments.

There are region-specific synonyms in different parts of the world like in the UK or the US. In the UK, these devices are commonly known as signal towers. On the other hand, in the US, stack lights, stackable lights or andon lights might be used more often than other synonyms. The term "stackable lights" highlights their modular nature and ability to stack multiple signaling modules. These region-specific synonyms reflect the variations in terminology and language used in different countries while referring to the same type of visual signaling device.

Full flexibility with high performance LED andon lights

As all our products, Auer Signal stack lights are developed and produced directly in our factory in Austria. The latest models are not only particularly flexible, but also future-proof due to the patented internal contact. In our product portfolio we provide tower lights with a diameter of 30mm to 70mm. With our products, the PC7, CT5, ECO40, ECO60 and ECO70, we offer a comprehensive range of modular andon lights. For high performance and flexible options, we recommend the PC7. For standard applications where high quality and an attractive price are required, the CT5 is the right choice. Our ECO series offers a standard program in three different sizes.

IO-Link stack lights

The PC7 as well as the CT5 are also available for IO-Link control. Thanks to the new IO-Link bases these signal towers are also suitable for IO-Link networks. The modular system of our andon lights enables an easy set up of the IO-Link stack light as the IO-Link technology is integrated into the base.

The following tower light bases offer IO-Link functionality:

  • PC7MC5IO IO-Link base with M12 5-pin connection for PC7
  • PC7BLVIO IO-Link base with terminal for PC7
  • CT5MC5IO IO-Link base with M12 5-pin connection for CT5
  • CT5KR1IO IO-Link tube base with terminal for CT5

Two different model types: modular and pre-configured stack lights

Auer Signal offers two different types of tower lights:

  • The modular series
  • The pre-configured series

The modular series can not only be put together individually, you can also add or replace individual modules yourself at any time.

If you wish to receive the andon light pre-assembled, choose one of our pre-configured models. The MT60, C30 and the design model: the HD can be directly connected, wired and used. Although pre-configured models can also be configured individually, they cannot be changed afterwards.

Individual tower lights for self-configuration

Our configurators allow you to configure your stack light to meet your individual requirements and needs. Alternatively, you can choose from the most common configurations. If you choose one of the pre-assembled versions, we can make you a particularly inexpensive offer starting with one ordered unit of andon lights. Our tower lights are certified according to current industry standards and can therefore be used worldwide.

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