Would you be allowed to run a pool pump and a salt generator from the same 2 pole breaker. The pool pump at 240V runs around 5-6amps and the salt generator at 240v runs at 1amp. Well below 80% or 12amps.
Multimotors are allowed on the same circuit as outlined in 430.24 of the NEC as long as each motor has some sort of disconnect insight of each motor.
These disconnects can be anything from cord and plug up to a knife disconnect with or without fuses or a breaker.
The Salt generator isn’t a pump. It some how puts salt into the pool water. The reason they want the salt generator to stop when the pool pump isn,t working is because harmful gases will build up. There is a panel inside the pool shed where everything is located.
It is actually a chemical generator that causes the Cl in NaCl (salt is already in the pool at about 5-6 PPT) to be freed for a few seconds and sanitize the water. The manufacturer’s instructions call for it to be on the pump circuit, like a heater, so it won’t run when the pump is off.