Good morning.
We would like to ask you a couple of things to check the MCCB trip error.
1) Have you checked resistance by Ohm meter?
2) Insulating condition of electric wires? Any damaged wires?
3) Any noise from the Blower during running?
4) Setting value(voltage setting) of the breaker? Is the same as the other blowers?
5) HEPA filter condition, if it is too contaminated, It may cause a blower load.
6) Blockage inside of blower pipe, any obstructs to interrupt air flow?
The things you can check out are above-mentioned.
Sorry but please check and reply to us.