The NPR500 series microcomputer protection and measurement device is suitable for small current grounding systems with voltage levels of 10kV and below, and can be used as general protection for incoming and outgoing lines, plant transformers, and capacitors.

NPR500-U1B microcomputer protection device: suitable for incoming cabinets and feeder cabinets
NPR500-B1B microcomputer protection device: suitable for protecting two power supply incoming cabinets and automatic switching
NPR500-U2B microcomputer protection device: suitable for protection of two power supply incoming cabinets and automatic switching of section switches
NPR500-PTB microcomputer protection device: suitable for PT cabinet, detection and parallel connection of two PT groups