The EPS-Box TP device is an additional equipment that can be installed with FoxESS energy storage systems. EPS BOX is used for automatic physical disconnection of the local AC power grid and activation of the EPS circuit for selected receivers by switching the circuits to the backup power supply provided by the EPS connector in the device. The device is fully maintenance-free, it is made of two contactors connected to each other to switch the circuits connected to it without collision.