Do you need to replace your intercom and don’t know which model is compatible with your installation? This guide with equivalence tables helps you identify the correct model according to your system — no construction or rewiring needed.
Which intercom system do you have? 4+N or 2 wires
Before consulting the table, identify your system:
| Feature | 4+N System (conventional) | 2-Wire BUS SCS System |
|---|---|---|
| Number of wires to the intercom | 4 or more wires | 2 wires |
| Common brands | Fermax, Auta, Golmar, old Tegui, old BTicino | Tegui, BTicino (current range) |
| Compatible Tegui Intercom | T-71U (Ref. 374240) | T-75 (Ref. 374290) / Series 8 (Ref. 374794) |
4+N System — Equivalence Table for Tegui T-71U (Ref. 374240)
The Tegui T-71U (Ref. 374240) is the universal intercom for conventional 4+N wire systems. Compatible with over 100 models from brands like Fermax, Auta, Golmar, Urmet, Bitron, Aiphone, Amper, Terraneo, Televés, Tesla, and many more.
How to use the table?
Find your old model in the table. Each row shows how to connect the wires to the T-71U according to the positions:
- 1E / 1Z — Electronic call or buzzer
- 2 — Common
- 3 — Microphone
- 4 — Speaker
- 5 — Electric door release
- P — Bridge / configurator
📌 Example: If you have a Fermax Ref. 80447, connect the wires to positions 1, 2, 4, 5, and P as indicated. If you have a BTicino 314011, the table shows the exact positions.
✅ Buy Tegui T-71U Intercom (Ref. 374240) →
2-Wire BUS SCS System — Tegui T-75 Series 7 Intercom (Ref. 374290)
If your installation has only 2 wires to the intercom and is from the current Tegui or BTicino range, your system is 2-wire BUS SCS. The compatible model is the Tegui T-75 (Ref. 374290).
| Model to replace | Compatible Tegui model | Reference | System |
|---|---|---|---|
| Old Tegui 2-wire Intercom | T-75 Series 7 | 374290 | 2-wire BUS SCS |
| Old BTicino 2-wire | T-75 Series 7 | 374290 | 2-wire BUS SCS |
⚠️ Important: The T-75 is NOT compatible with 4+N installations. If you have 4 or more wires, use the T-71U.
✅ Buy Tegui T-75 Series 7 Phone (Ref. 374290) →
2-wire BUS SCS System — Tegui Series 8 Intercom (Ref. 374794)
The Tegui Series 8 Intercom (Ref. 374794) is the most modern design model for 2-wire BUS SCS systems. It directly replaces intercoms of the same range without modifying the wiring.
| Model to replace | Compatible Tegui model | Reference | System |
|---|---|---|---|
| Old Tegui Series 8 Intercom | Series 8 | 374794 | 2-wire BUS SCS |
| Old BTicino Series 8 | Series 8 | 374794 | 2-wire BUS SCS |
✅ Buy Tegui Series 8 Intercom (Ref. 374794) →
Can't find your model? Contact us
If your old model does not appear in the tables or you are not sure about your system, send us a photo of the current intercom and wiring and we will confirm the compatible model for free.
🛒 See all Tegui and BTicino intercoms →
Advantages of using this equivalence guide
- ✅ Identifies the compatible model without tests or errors
- ✅ Keeps your existing installation without changing wiring
- ✅ Valid for 4+N and 2-wire BUS SCS systems
- ✅ Compatible with more than 100 old brands and models
- ✅ Free technical support if you have questions
