This depends on the application. We always recommend an energy efficient relay which consumes few energy when turned on.
|Pack voltage||Maximum current||Relay||Note|
|24V||<= 100A||123\SmartRelay 120A|
|12V/24V||>120A & <500A||TBS Battery Protect Relay|
|48V||<100A (200A for 1 minute)||123\PowerSwitch 48V 100A|
|All voltages||<500A||Kilovac EV200||Coil voltage up to 96V|
Consumes about 50mA, which is much more than the ~1mA of the 123\PowerRelay and the 123\PowerSwitch