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