Live only circuit with 3 loads
According to your circuit, it's not T1 feeding BR1 but the other way round.
Here's the equivalent circuit for easy understanding.

When D1 is 'off', a winding of T1 is in series with load 1. The winding is also energised by 340 V DC (240 V~ rectified by BR1).
When D1 is 'on', BR1 and T1 are bypassed.
T1 is not a transformer since DC is fed to it.
The purpose of BR1 &amp; T1 is not clear.
D6 &amp; D7 switch loads 2 &amp; 3.