In my 1978 Trillium
4500, there is an original power center (converter) below the closet and original furnace
. This power center has a round 15 amp AC circuit breaker and a round 10 amp DC circuit breaker. It also has a switch for flipping between battery
power and shore power. Inside the unit is a transformer for converting 110 VAC power to 12 VDC power.
When I bought the trailer, nothing in the power center worked. I replaced both the AC and DC circuit breaker, as well as the transformer.
Also, there is a black fuse holder in the wire bundle under the front bench.
EDIT: Now everything works. So in summary, my Trillium
4500 has only 1 AC circuit breaker, 1 DC circuit breaker and 1 DC inline fuse.