I'm sorry if I wasn't very clear. LCB's are for DC motors only. No AC!
Sizing is very simple. Whatever your maximum draw from your load; set the LCB 20% to 25% higher for a factor of safety. For example, if the compressors has a start up draw of 8 amps spec. the LCB at 10 Amps. Usually the LCB's are fused but I suggest you fuse at the compressor as well. Just in case.
Please keep in mind my expertise is very limited here...I am a mechanical engineer and most of my electronic knowledge is self taught. Fair warning and be aware. Kind of like when a machinist see's me walk into the shop and start using the tools.
