As a bit of background - I'm in the middle of planning out a parts list for a 50A control panel (upgrading from a smaller 120VAC toolbox build I have currently).
I'm trying to figure out which parts to use for the contactors. I'm aiming to use 2x 50A contactors: 1 for main power on/off and one for elements on/off (2x 4500W elements on the same control circuit for the option of 30+ gallon batches).
I was looking at this: 40A contactor
from auber instruments.
Full Load AMPS 40A, 120-600VAC
Resistive SMPS Rating 50A, 120-600VAC
I don't know enough about electrical terminology to know if that means it's rated for 40A or 50A for control panel main power control. I did some searching on google to try to find out what "AMPS" versus "SMPS" means but came up empty handed.
Looking at Grainger I see that essentially all their contactors that are 40A are rated for 40A Inductive load and 50A resistive load. As near as I can tell the control panel is resistive load so it seems like a 40A contactor would be rated appropriately for the use.
I was hoping someone could either validate that my conclusion is correct & I can use this contactor or tell me that I'm totally wrong before I order it