Max of 40 smoke alarms can be connected to a single 756.
This is the link to the page https://www.clipsal.com/Trade/Products/ProductDetail?CatNo=756
https://updates.clipsal.com/ClipsalOnline/Files/Brochures/A0000292.pdf
Key Features
- Changeover Contacts: 1xNormally Open (N.O.), 1xNormally Closed (N.C.)
- Contact Rating: 10 A resistive and inductive, 250 V AC, 50 Hz
- Interconnection Input: 6 V to 10V DC. referenced to Neutral
- Supply Current: Alarm mode - 1mA minimum. Non-alarm mode (standby)
- Maximum number of smoke alarms interconnected to a single 756 Isolation Unit: 40
- Switching Delay: 20 seconds
- Cables Accommodated: 2 x 2.5 mmsq