Welcome to EP.
Finding this connector can be a headache .
There are so many variations from so many vendors.
What makes this one a headache is the triangular keying it has.
Do you have a parts list?
Can you connect the manufacture for info?
If the answer to the above is No.
The best would be to connect the main connector companies and ask for help.
send the picture and the pitch
MOLEX and
JST and
TE(AMP)
In the worst case ,if you don't get any info,
you can substitute the connector with a standard 3 pin connector you do know.