Schneider SPD PR-20KA / 4P a product description PRD and fixed plug-in surge protection using the same principle and selection criteria. It consists of a base, a neutral core and one or more phases of the core composition. When the core reaches the end of life, you only replace the actual failure of the core. Because it does not have to open or re-wiring, so greatly save time. In addition, their technology has improved the performance of the same: Voltage protection level Up PRD device even lower, thus ensuring greater protection. The maximum surge current: 100/60/50 / 35kA □ Response Time: 100ns □ voltage protection level: 1.5 / 0.9kV □ Poles: 1P, 1P + N, 3P + N □ Working temperature: -20oC - + 60oC II. The main parameters: Replaceable PRD Series Maximum discharge current: 65/40/15 / 8kA (8 / 20μs) nominal discharge current: 20/15/5 / 2kA (8 / 20μs) voltage protection level: 2 / 1.8 / 1.5 /1.2kV provide common mode and differential mode has two kinds of protection status indication window ST series fixed maximum discharge current: 65/40 / 10kA (8 / 20μs) nominal discharge current: 20/15 / 5kA (8 / 20μs ) voltage protection level: 1.5 / 1.2 / 1kV provide common mode and differential mode has two kinds of protection status indication window PRI Series Network Rated voltage: 6/12 ~ 48V maximum discharge current: 10kA (8 / 20μs) voltage protection level: 15 / 70V for digital communications network protection PRF1 Series Maximum surge current: 60kA (10 / 350μs) protection level: Up≤4kV maximum continuous operating voltage: 255V Response time: <100ns for overhead line protection three, PRD base working status indication PRD remote control feature is an auxiliary contact, when the end of the service life of the one or more cores mounted on the base, it will open by a changeover contact remote alarm light or buzzer. There are also instructions on the core.