Part Description Part Description UPS rear panel input jack to connect the UPS input power. 1kVA UPS input socket IEC320-C14 socket; 2kVA 3kVA UPS input socket outlet IEC320-C20 input overcurrent protection device for the UPS to provide input overcurrent protection. 1kVA UPS input overcurrent protection the device rating 250Vac/7A; of 2kVA 3kVA UPS input overcurrent protection device rating for 250Vac/16A output socket connected load, load power. Specifications 250Vac/10A GB socket output terminal block connected load, load power. Only 2kVA and 3kVA UPS output terminal block specifications for 250Vac/10A external battery socket connected to an external battery. Long delay models only external battery socket surge protector outlet surge protection computer network port computer interface RS232 communication interface, can be connected to the background monitoring computer fan for UPS internal cooling and ventilation