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KiCAD design files for DIN rail energy monitor power , voltage and current sampler
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README.md

DIN Rail Format Energy Meter Base Board

Power SMPS module

  • 90v-240v AC input
  • Isolated 5V output
  • 600mA / 3W power rating

Over-voltage protection/over-current protection

  • 0.1A rated PTC fuse
  • 300V rated TVS suppressors, x1 per-phase

Isolation

  • 5v DC-DC isolator to power metering module

Power supply clean-up

  • x2 1117 series LDO for generating 3.3v from 5V input to clean up SMPS noise

Backup-power

  • MCP73831 series floating Lipo battery charger for backup lipo battery

AC Voltage Sampler

  • x3 Voltage divider ladders with 880K + 1K total serial resistance

AC current Sampler

  • x8 2.4ohm current sense resistor based CT clamp inputs

Connectors

  • 5.08mm spacing phoenix contact AC voltage connector
  • Molex nanofit 2x4 type dense AC current clamp connectors
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