Forum Discussion
DrewE
Apr 08, 2018Explorer II
Sometimes a good thump or poking at it after opening it up (obviously with all power removed) can unstick them. It still probably should be replaced as I suspect it's not likely to keep working well for too much longer once it's been stuck once.
Most 30A transfer switches use a single big double-throw double-pole relay/contactor, with some sort of time delay circuit on the switch over to generator power. The shore power is the normally closed circuit, and the generator the normally open one that gets closed after the time delay. Contacts that get too hot (due to wear or arcing) can weld themselves together and keep it from switching back properly, and this is one common source of sticking; to a large extent, this sort of damage can be avoided by not switching under (heavy) load.
Edit: Also check that the connections between the power cord inlet and the transfer switch haven't worked loose. It may be as simple as a screw that needs tightening or a wire nut that needs re-nutting.
Most 30A transfer switches use a single big double-throw double-pole relay/contactor, with some sort of time delay circuit on the switch over to generator power. The shore power is the normally closed circuit, and the generator the normally open one that gets closed after the time delay. Contacts that get too hot (due to wear or arcing) can weld themselves together and keep it from switching back properly, and this is one common source of sticking; to a large extent, this sort of damage can be avoided by not switching under (heavy) load.
Edit: Also check that the connections between the power cord inlet and the transfer switch haven't worked loose. It may be as simple as a screw that needs tightening or a wire nut that needs re-nutting.
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