I need a little terminology help so I can search for and obtain the correct relay.
The relay will control a 48v 32a circuit. It should be normally open unless a signal is present. If the signal is present, the relay will close to complete the 48v circuit . The signal current level is 175mA maximum.
The relay will not be on a PCB or rack of any kind, but probably mounted on a plywood board.
Does such a relay exist? How would it be described? Someone said I'd need to amplify the small signal in order to control large contactors. Is that true, and if so, how would I configure (or describe) that?
If someone has a specific brand or part to recommend, that would certainly be welcome.
EDIT: I have a 48v battery bank of LiFePO4 cells. The SOC cannot drop below a certain percentage or it will damage the cells. The battery management system (BMS) has a method to send a signal if the pack is okay to use. Here is what the BMS manual says:
An open drain digital on/off signal (is) used to signal to a load that the load can discharge the battery. This would normally be used to control a discharge contactor or to signal to a controller that discharge must be stopped if this signal is not present. This signal can be used as a backup to digital CAN communication with a controller. This is a signal current level (175mA max) and should be amplified for controlling large contactors or relays.
So it would seem that I need a relay, but there are so many types I'm having difficulty knowing how to narrow the search to what I need.