The DSZY121 Level 1 Three Phase Four Wire Cost Control Intelligent Energy Meter (Carrier/Remote/Switch Built in) is an intelligent metering product that integrates carrier communication and energy measurement. It can be combined with a concentrator and management system to form a low-voltage power line carrier automatic meter reading system, completing long-distance transmission of metering data and power on/off control. The performance indicators of this product meet the requirements GB/T17215.321-2008，GB/T17883-1999，DL/T698.1-2009，DL/T645-2007，Q/GDW361-2009 Waiting for the relevant standards of State Grid Corporation of China on smart energy meters.

The Level 1 three-phase four wire cost control intelligent energy meter has positive and negative active energy metering functions and can store its data;

Accumulate and store the total, peak, off peak, flat, and valley electrical energy according to the corresponding time periods;

It has a complete multi rate settlement and billing function, and can set two sets of time periods, each set of time periods can set four rates;

Support modifying rate and time slot tables through infrared and RS485 communication interfaces;

The Level 1 three-phase four wire cost control intelligent energy meter can store the total one-way or two-way energy and various rate energy data for 12 settlement days. In the event of a power outage in the energy meter, all settlement related data should be saved for at least 10 years, and other data should be saved for at least 3 years;

Adopting an external plug and play carrier communication module, and the carrier communication interface has a failure protection circuit;

The power line carrier communication module can achieve remote real-time point reading and regular reading of meter data.