Dual Coil Latching Relay NO and NC Setup
Your zener / rectifier diode flyback protection circuit is incorrect.
For this application, rectifier diode flyback protection would be adequate.
Here's the correct schematic, using two 1N4007 diodes.

Should my presumption of push button switch control be correct, the following circuit, employing a standard relay and a rotary on / off switch, should suffice.

MCB / fuse / thermal overload relay protection and earthing are not shown but are to be taken care of.
In my opinion, instead of a single pole relay, a contactor would be the right choice for motor control. The contactor, intended for motor duty, would have 3 sets of double-break contacts that would enable the neutral line also to be switched. It would also facilitate mounting of a thermal overload relay.
If the latch relay or a standard relay is a must then its contact could be used to drive the contactor.