A protective relay is a s witchgear device that detects the fault and initiates the operation of the circuit breaker to isolate the defective element from the rest of the system . They are compact and self-contained devices that can detect abnormal conditions. https://youtu.be/PKBl0orLVcA Specification: Compact Size , MCU based Protection: Reverse Phase, Phase Loss LED indication for each protection trip Trip output : 1c(DP-ST) Auto reset Phase loss protection: Available during forwarding & Reverse DSP-VPFR44 : 3 Phase, 300~480VAC Model: DSP-VPFR44 Package includes: 1 x PROTECTION RELAY  DSP-VPFR44 SAMWHA Facebook Instagram Pinterest