Exchange of door stations and letterboxes

New shine for old door stations and letter boxes: retrofit systems in metal design from Siedle Classic replace the fronts of old systems from the TL 411 series. The walled-in housing can be retained. Only what should be modernized is modernized.


Door station replacement – an overview

Siedle Classic Austausch der Türstationen und Briefkästen

TL 111 - the classic

The characteristic loudspeaker grill of the TL 111 series shaped the face of Siedle and millions of entrance areas. After decades of use, many of these classic devices are in need of a facelift or are slowly coming to the end of their life.

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Siedle Classic Modernisierung

CL 111 - the successor

The typical shape is retained: The CL 111 variant from the Siedle Classic design line has been specially developed for replacing the TL 411 series. It comes with up to six bell buttons and the front panel fits exactly on the old screw connections. This makes mounting easy; built-in housing, installed cables, line rectifiers and indoor call stations all remain in use.

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Siedle Classic Modernisierung

The workaround

When the TL 411 series was superseded, we fitted modules from the successor system Siedle Vario 511 in an adapter plate which fits on the flush-mount housing of the TL 411. Therefore this type of mixed-construction system can also be replaced with ease with the Siedle Classic CL 111 replacement model.

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Letterbox replacement – an overview

Siedle Nachaltigkeit

Replace with ease and preserve value

Sustainability proves effective as part of a product strategy: Siedle offers retrofit systems for old letterboxes and letterbox systems without the need for an adapter. These simply use the existing flush-mount housing. Any existing electrical installation can often be used too, which reduces the amount of effort and expense and mess.

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Siedle Classic Modernisierung

Solid stainless steel, modern technology

The renovated letterbox system is designed to last as long as the old one. The stainless steel pass-through flaps are soft closing. The engravable grip bars are made of the same material with the very same opulent strength. A marked contrast to the bent sheet metal seen on many letterboxes.

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Siedle Classic Varianten


Retrofit systems are available from stock for the three most popular versions of the old TL 411 letterbox series. The dimensions of the front panel, the mail slot and the fixing holes are designed to match those of the existing housing.

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Interested in modernisation with Siedle? All contact partners:

Siedle door communication is incredibly versatile.

Information for builders

Who you can trust

Durable and retrofittable

A Siedle system is a safe investment. Because we develop our systems for a long service life. And when developing new products, we attach great importance to backward compatibility and update capability.

Quality and sustainability

Made in Germany

We are a high-tech company that uses the latest production methods. It’s also traditional human qualities and skills that give our products their very own character.

Made in Germany

Simple. Secure.

Siedle products provide functions that make the lives of the people using them simpler and more secure. We avoid excessive and fussy complication in favour of greater clarity.

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