Transfer Switch Contactors
Are the individual contactors inside the transfer switch replaceable? And does a 50 amp system use 220v contactors? Are they difficult to replace? thanks, Ron
Forum Discussion
It might well vary depending on the model of transfer switch. If they are replaceable, they would presumably have to be swapped only for a precise exact replacement to maintain safety and safety certifications.
The coils for the relays (contactors) would be 120V coils because otherwise 30A shore power or many RV generators would not work (as they connect both hot lines to the same phase). The contacts I would think would have to be rated for 240V operation in as much as the hot lines, at least, could see that voltage across them depending on the precise timing of the opening of the other contacts. The difference between contacts rated for 240VAC and those rated for 120VAC is probably as much regulatory paperwork as anything; it's not a huge physical change.
The coils for the relays (contactors) would be 120V coils because otherwise 30A shore power or many RV generators would not work (as they connect both hot lines to the same phase). The contacts I would think would have to be rated for 240V operation in as much as the hot lines, at least, could see that voltage across them depending on the precise timing of the opening of the other contacts. The difference between contacts rated for 240VAC and those rated for 120VAC is probably as much regulatory paperwork as anything; it's not a huge physical change.
