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On newer furnaces the fan starts in a period of time factory set and is initiated by the control board. The air conditioning fan is started by the thermostat and starts right away when the stat calls for cooling. You will need a tech. familiar with this model and carrying the right parts to look it over. Does the furnace fire and then shut off in a few minutes? If so, it is most likely to be the board. Sorry. It may be pricy.
Treat the shunt trip as if it were a switch. The neutral (usually white wire) on the shunt trip connects to the neutral busbar. The other (usually black) wire is the "switched leg", so to speak. The hot that goes out to the relay comes off a _separate_ breaker. The return from the relay connects to the black "switched leg" on the shunt tip. Most shunt trips have 2 wires coming off the shunt trip, a white and a black. If your breaker has contacts instead of wires coming off the shunt trip, the concept is still the same.
lament term is relay bounce. that's one. another could be that the line side of the contact is fed by parallel lines causing something called eddie current causing an unbalanced load. you may not have all of the terminals where the wires terminate tight, that will cause heat to build up at the contact. you could be using the wrong contactor for that particular application. check the life cycles, not the amperage rating. then again, check the amperage rating for contactor, then look at the device and what are the specs for that. if it runs at a higher ampacity than the contactor will burn up every time. are there thermal overloads on the contactor. if so, what are their rating........ these in fact are all valid questions I just asked you, and I can keep going, for days. you have to give more specifics than that, otherwise anyone who knows electricity will never be able to give you an accurate diagnoses. I'm more than willing to help though. it even comes down to the manufacture who makes the contact. sometimes you want a certain name brand for a certain application.
This should be 110v so you will have black wires, white wires and ground wires. The grounds wires both go to the ground bar, the whites wires both go to the nuetral bar, or can be wire nutted together, the black incoming (feed) wire goes to the buss bar that the breaker plugs into and the black going to the furnace goes into the breaker lug.
If you are not familiar with electrical wiring, I would suggest an electrician. NEVER TRUST COLORS! Most of the time, white goes with white, black with black, red with red, and bare to bare. But depending upon whether this is a 110 or 220 they could be mixed up depending upon how the feed wire is wired at the box. Hope this helps! c