One of the most common questions among electricians and installers is:
"I have an old Tegui; what is its current replacement?"
It is a logical question. The problem is that looking for equivalents solely by reference can lead to installation errors, returns, and hours lost on site. Technical support enquiries confirm this: it is one of the most frequent and costly mistakes in replacement projects.
The reference visible on the front of the monitor is not always sufficient to determine its replacement. Before ordering any equipment, you must identify:
- ✔ System type (2-wire BUS, 4+N, Series 7, SCS BUS)
- ✔ Number of wires connected to the monitor
- ✔ Type and capacity of the power supply
- ✔ Existing configuration (N, P, M, DIP switches, microswitches)
- ✔ Functions used (call only, door release, intercom)
- ✔ Presence of video, audio, or WiFi
- ✔ Presence of a speech unit or auxiliary modules
This guide explains why, highlights the most common mistakes, and provides a professional checklist to avoid them.
The most frequent mistake: thinking that the monitor defines the system
The most common mistake when replacing discontinued Tegui monitors is assuming that the monitor reference determines its direct replacement. It does not.
Typical real example found in support enquiries:
| Situation | Detail |
|---|---|
| Existing monitor | TG374455 (Swing) |
| Common mistake | "I’ll just install any Classe 100 and be done" |
| Reality | Check the following: confirmed 2-wire BUS system, green configurators (N/P/M), capacity of the existing power supply, active auxiliary functions |
| Consequence of the error | Installed monitor that does not receive calls, incorrect image, or unstable system |
The Swing and the Classe 100 both use a 2-wire BUS system, so replacement is possible — but only if the N/P/M parameters of the original monitor are correctly replicated. If the Swing had N=4 and the Classe 100 is installed with the factory configuration (N=1), the monitor will not receive any calls even if it is connected correctly.
Another frequent case: replacing a Series 7 monitor (4+N system) with a Classe 100 (2-wire BUS system). They are physically similar, but electrically incompatible. The installer connects the Classe 100 to the 4 wires of the Series 7, and the system does not work. This is not a monitor defect: it is a system incompatibility.
Equivalence reference table (NOT universal)
⚠ Warning: this table is for guidance only. The actual equivalence always depends on the installed system, the power supply, the configurators, and the functions used. Never order equipment based solely on this table without first verifying the system.
| Old model | System | Common replacement | What must be checked |
|---|---|---|---|
| Swing (TG374455 and similar models) | 2-wire BUS | Classe 100V16B / Classe 100V16E | Replicate N/P/M configurators. Verify the power supply capacity if switching to video. |
| Series 7 (video monitor) | Series 7 (4+N) | There is no direct video replacement for 4+N. Consider upgrading to 2-wire BUS. | Video will be lost if only the monitor is replaced. Change the system if video is to be retained. |
| M72 (audio) | Series 7 (4+N) | Series 7 Kit A1 | Verify compatibility with the existing entrance panel. Check auxiliary functions. |
| Europa Series (EGF1/E14) | 4+N or specific analog system | Not universal. Requires prior diagnosis. | The Europa Series system has variants that are incompatible with each other. Identify the exact subsystem before proceeding. |
| Horizon (red) | Specific Tegui system | Check reference 374250 as a possible alternative | Verify compatibility with the existing entrance panel and power supply. A direct replacement is not guaranteed. |
| Very old VT8 and similar models | Old analog system | No direct replacement. Complete system renewal. | There is no current equivalent. Budget for a complete upgrade to 2-wire BUS. |
The “usual replacement” column indicates what usually works in most cases, not what will work in every case. Some older references have no direct replacement and require partial or complete system renewal.
Professional checklist before ordering materials
This is the protocol we recommend following before replacing any discontinued Tegui monitor:
Step 1: photograph the complete installation
Before disconnecting anything, take photos of:
- Front of the monitor: visible reference, overall condition
- Back of the monitor: number of connected wires, colors, terminals
- Configurators or DIP switches: exact position of each jumper or microswitch (N, P, M)
- BUS power supply: model, reference, year if visible
- Audio module (if present): model and connections
- Entrance panel: complete reference, camera condition
These photos are your insurance. If something goes wrong after the replacement, they allow you to reconstruct the original setup.
Step 2: count the wires correctly
Count only the wires connected to the monitor terminals, not those in the conduit or the handset wires:
- 2 connected wires: 2-wire BUS system → Classe 100 and Classe 300 monitors are compatible (with correct configuration)
- 4–5 connected wires: 4+N or Series 7 system → 2-wire BUS monitors are not compatible without changing the system
- 6 or more wires: old analog system or mixed installation → requires detailed diagnosis before proceeding
Step 3: note down the configurators
For 2-wire BUS systems, note down before dismantling:
- N (home address): the value programmed into the current monitor
- P (sub-address within the home): 0 for the main monitor, 1 for the second, etc.
- M (operating mode): usually 0 in standard installations
- DIP switch or microswitch positions if the model uses them instead of a menu
The Tegui 2-Wire Green Configurator Coding Kit (BTicino 306065) is essential to keep in the van for models that use physical jumpers. For complex installations or installations with several monitors, the BTicino 3501K Configuration Kit allows you to program and verify the entire installation.
Step 4: Check the BUS voltage
Using a multimeter, measure the voltage between the monitor's two terminals with the system at rest:
- ~27-30 V DC: Tegui/BTicino 2-wire BUS system in good condition
- Different or AC voltage: different system or faulty power supply → do not continue without additional diagnosis
- 0 V: power supply switched off, faulty, or cable cut
If the voltage is correct and there are 2 cables, the system is a 2-wire BUS system and replacement with a Classe 100 or Classe 300 is viable. The BTicino 346030 2-Wire 2 DIN Compact Power Supply and the BTicino 346050 2-Wire SCS BUS Power Supply + Video Adapter are the standard replacements for these situations.
How to avoid returns and on-site errors
A rule that saves a lot of trouble:
Never order a replacement based solely on the monitor's front reference.
Before placing any order, have this information ready:
- ✔ Full monitor reference (front y rear label)
- ✔ Photo of the back with the cables connected
- ✔ Photo of the BUS power supply
- ✔ Photo of the entrance panel
- ✔ Installation type (2-wire / 4+N / Series 7)
- ✔ N/P/M values configured on the current monitor
With this information, we can confirm the correct equivalent without any margin for error before you place your order.
Current monitors available as replacements for discontinued models in 2-wire BUS systems:
- Hands-Free Tegui Classe 100A16E (344282) — Audio only
- Tegui Classe 100V16B 5" Hands-Free Monitor (374511) — With video, the most common replacement for Swing and similar models
- BTicino Classe 100X16E WiFi monitor (344786) — 2-wire with WiFi and a mobile app
- Classe 300EOS WiFi monitor with Alexa — BTicino 344842 — For installations requiring WiFi and a mobile app
- BTicino Classe 300X New Light monitor, 7" touchscreen — High-end range with touchscreen
Frequently asked questions about Tegui equivalents
Can a Swing always be replaced by a Classe 100?
Not always. Both are 2-wire BUS systems, so replacement is possible in most cases, but the power supply's compatibility must be verified (especially when switching from audio to video), and the Swing's N/P/M configurators must be replicated exactly. A Classe 100 installed with factory settings instead of the Swing's configuration will not receive calls.
Can a 2-wire monitor be installed in a 4+N system?
No. 2-wire BUS and 4+N systems are electrically incompatible. A Classe 100 monitor (2-wire) connected to a 4+N installation will not work, even if it can be physically connected. They use different protocols.
Do discontinued models always have a direct replacement?
Not necessarily. There are older references—especially from analog systems predating 1995—that do not have a direct replacement in the current catalog. In these cases, the only solution is partial or complete system renewal. It is better to know this before preparing a quote than to discover it on site.
Can I mix monitors from different ranges in the same 2-wire BUS installation?
Yes, within the Tegui/BTicino 2-wire BUS system, it is possible to have a Classe 100A16E (audio), a Classe 100V16B (video), and a Classe 300EOS (WiFi) in the same installation, provided each has its N/P address configured correctly and the power supply has sufficient capacity for the total load.
What information do you need to confirm an equivalent?
Complete monitor reference (front and rear label), a photo of the cables connected to the terminals, the BUS power supply model, and the outdoor panel model. With that information, we can confirm the correct equivalent before you place the order.