When discussing electricity it is common to break into two parts. There is the supply side which is where the power exists and the load side where the work gets done. In a lighting the supply side would be your house power, for example; and the load would be the bulb. In a flashlight the supply is the battery and the load is the bulb.
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It is connected to the secondary side.
A normal transformer should not blow the primary side breaker when it is not connected to a load on the secondary. If it does, something is wrong. Check for shorted or burned windings. Make sure that it is indeed disconnected from the load - it might still be connected to something that is also presenting a fault.
On the load side of the contactor. T1,T2,T3.
A kettle is wired in series when it is plugged into the household receptacle. The "hot" potential is on one side of the resistive load and the neutral return wire is on the other side of the resistive load.
The positive terminal of the battery would be connected to the positive terminal of the ammeter. The load would then be connected between the two negative terminals, positive side of the load being connected to the negative side of the ammeter.