I'd be more than happy to help you but your model number is incorrect. I think you mean a B1HH048 and your missing a number from the serial number. I think the unit was made in middle of January 1998... from what i can tell.

What you have is one cable bringing in power and the other cable goes to the switch (a switch loop). By wiring the black from the switch to the black from the power (and the same for the whites), you created a dead short from hot to neutral when you turned the switch ON. This was NOT the the way you originally found it. You probably welded the contacts in the switch together when you turned it on, necessitating its replacement. Turn off the bathroom breaker to be able to reset the main. The way it should be wired, for both lights and the fan to be operated by the switch is: Black from the power cable connected to the white from the switch leg. Black from the switch leg connected to the blacks from the lights and fan. Whites from the lights and fan connected to the white from the power cable. All green and bare copper ground wires connected to each other.

Got my answer from Lutron technical support, its possible if I watch the amp draw and the watts on the lights. They have a product that will work.

If the vent/light combo is designed for use in a bathroom and you are not within the shower enclosure, it should be a straight changeout as long as you want the light and vent to come on at the same time. If you want them to be operated separately, then you will have to do some rewiring.