It has also happened to me like you with the TOA-60. In my case, only one of the contactor sides or one of the covers was smashed. The internal mechanism can still be used; Therefore, I can think of buying one that has 3 similar contactors either on one or both sides and placing it on the end of the switch which is still intact. What I have observed is actually melting around where the voltage line is present. Other than that, nothing else has deteriorated on the switch. For this reason I suggest buying a similar one and disassembling it to use one of the contactor caps to replace the one that is melted. When I do I will let you know about the success of this.
Cal.
