Ladder-type pre-paid electricity meter uses

Energy Measurement:  mcb circuit breaker  single phase active energy.
Pre-paid functions: local pre-paid, you can step directly on the meter metering, chargeback.
Remote meter reading: a power line carrier, RS-485, wireless and other communications electric transformer , communication protocols meet DL/T645
Alarm function: When the remaining  circuit breakers is insufficient, via the display, e-mail, SMS and other means to inform the user
Overdraft feature: allows you to set overdraft consumption, when more than overdraft threshold, the meter off, recharge automatically deduct the amount of overdraft