Manufacturer & Model: Janitza electronics GmbH – B24 313‑10J, part number 1401361
Functionality: MID-certified three-phase transformer-connected energy meter (1 A primary with 5 A CT input), designed for measurement and billing-grade applications
Current & Voltage Specs:
- Transformer input: 1/5 A (supports CT ratios)
- Voltage rating: 3 × 220–240 VAC phase-neutral (–20/+15%) at 50/60 Hz
Accuracy & Standards: Class B (approx. 1%) for active energy, Class 2 for reactive energy; compliant with MID (EU measuring instruments directive) and IEC standards
Connections & Interfaces:
- Integrated M‑Bus interface for remote readout
- 2 tariff inputs and 2 pulse/alarm outputs (configurable S0)
- Optional pulse output mode for active/reactive energy or as an alarm signal
Display & Form Factor:
- 4-digit LCD display
- Mounting on DIN-rail, 4 TE width (approx. 72 mm)
Environmental Specs:
- Operating temp –40 °C to +70 °C
- CT connection cross-section: up to 25 mm²
- No internal energy reset; suitable for verified billing usage

Janitza – B24 313-10J (M-Bus) – 3-Phase MID Energy Meter, 1/5 A Transformer