Those contactors can be used to create an interlock that will prevent the motor from reversing *while* powered, but will not prevent the sequence:
Motor on CW, Motor Off, Motor on CCW (or the reverse)
from being executed quickly enough to blow the controller, due to the fact that the motor could still be spinning at high speed CW when the CCW direction is engaged, which is the real risk. Preventing a change directly from CW to CCW, or vice-versa, can be implemented with just two DPDT relays, such that one relay is disabled any time the other is enabled. But the CW-Off-CCW sequence, or its reverse, is also deadly to the controller, if the motor is not allowed to spin down during the Off portion. That can only be prevented by use of speed sensing, whether direct (e.g. - an encoder, speed switch, etc.) or indirect (e.g. - measuring back EMF), or by ensuring the Off state persists long enough for the motor to coast to a stop.
Regards,
Ray L.