Most spas operate on a dedicated circuit of 50 or 60 amps at 230 volts. To connect a hot tub to this circuit, an electrician must integrate your home's main circuit breaker with a 50 or 60-amp breaker in the external disconnect box. The GFCI will correspond with the house breaker so that a 60A GFCI is paired with a 60A house breaker. Whether you need 50A or 60A depends on the number and size of pumps in your hot tub.