The Siemens 7KT1656 is the MID-certified S0 pulse variant of the PAC1600 single-phase series. Direct 63 A connection means no external current transformers — the meter wires straight into the supply. S0 pulse output feeds energy data to pulse counters and BMS digital inputs, and MID certification makes the readings legally valid for tenant billing.

Single-phase 63 A direct — where does this configuration fit?

This is the meter for individual apartment, small office, and retail unit sub-metering. A 63 A single-phase supply covers the vast majority of residential and light commercial installations. The meter connects directly in series with the load — three wires: line in, line out, neutral. No CTs to mount, no auxiliary power to wire (the meter is self-powered from the measured voltage). At 36 mm wide (2 DIN modules), two of these fit in the space of one three-phase meter.

S0 pulse output with MID certification — when do I need both?

This combination serves billing applications where the data collection infrastructure uses pulse counting. Common scenario: a multi-tenant residential building where each apartment has a 7KT1656, the S0 pulse outputs are wired back to a central pulse concentrator or M-Bus data logger with S0 inputs, and the MID certification ensures each tenant's invoice is legally defensible. If you do not need billing-grade certification, the 7KT1655 provides identical S0 functionality at lower cost.

Frequently Asked Questions

Can two 7KT1656 meters fit side by side on a standard DIN rail?

Yes. Each meter is 36 mm wide (2 standard DIN modules). A standard 12-module distribution board can hold up to 6 single-phase PAC1600 meters, making it practical to meter multiple residential units from a single electrical riser cupboard.

Does the MID certification require special sealing during installation?

Yes. MID-compliant metering requires that the terminal cover and connections be sealed to prevent tampering. The meter is factory-sealed, but the installer must additionally secure the terminal area. Check local metrology regulations for specific sealing requirements in your jurisdiction.