CE Marked
TOMZN Din Rail Single Phase Weekly 7 Days Programmable Energy Controller 16A
AC 220V/230V
16A Relay
DIN Rail 35mm
24+
Years Manufacturing
5,700 m²
TÜV Assessed Plant
100+
Export Territories
Class 1.0
IEC/EN 62053 Accuracy
Export Inventory
High-Accuracy Energy Metering & Automation Hardware
Direct supply from Liushi Town, Wenzhou: CE-certified three phase smart meters, modular sub-meters, and integrated DIN rail energy controllers.
Verified
TOMZN 1NO 1NC DIN Rail Precision Power Switch AC 220V/230V 12V-48V Multi-Voltage
1NO + 1NC
Multi-Voltage
Class A Micro
Industrial
TORT7 Series 10-in-1 Asymmetric Delay Cycler Switch 0.1S-10D Interval Controller
10-in-1 Timing
Pulse Gen
Wide Range
Smart IoT
TOMZN TOS7-B Bluetooth Smart Switch 40A 63A 85-265V EasyCon App Controller
Bluetooth IoT
40A / 63A
28 Groups
Wall Mount
TOMZN Bluetooth Wall-Mounted Smart Controller 85-265VAC 10A 30A Loop Manager
Loop Timing
10A / 30A
85-265V Range
DIN / Wall
TOS6-40 Bluetooth Time Control Switch 35mm DIN Rail & Wall-Mounted 40A AC85-265V
40A Capacity
35mm Mount
EasyCon Sync
Three Phase
TOMZN 63A 3-Phase 3P+N DIN Rail Voltage Protector & Intelligent Power Monitor
3P+N 380V/400V
True RMS
Phase Imbalance
Smart WiFi
TOB9e-63M WiFi Smart Circuit Breaker with Integrated Bi-Directional kWh Metering
kWh Metering
eWeLink App
Overload Trip
Engineering Authority: Three Phase Energy Meter Standards & Technical Specifications
Modern industrial, commercial, and microgrid installations operate under dynamic harmonic conditions caused by nonlinear switching electronics, variable frequency drives (VFDs), and solar PV inverter feed-ins. Specifying three-phase energy meters requires precise alignment with European electromagnetic compatibility (EMC) regulations, low-voltage directives (LVD), and metrological standards established under the Measuring Instruments Directive (MID 2014/32/EU) and relevant EN/IEC frameworks.
Metrological Standard Benchmarks: For secondary distribution and revenue billing within CE-governed regions, Class 1.0 (IEC 62053-21) or Class B (EN 50470-3) provides an active energy margin of error below ±1.0% under nominal load, whereas Class 0.5S (IEC 62053-22) is required for high-draw primary industrial feeds.
Direct Connect vs. Current Transformer (CT) Integration
System designers must select between Direct Connection (typically rated up to 63A, 80A, or 100A RMS) and CT-operated architectures (typically 1A or 5A secondary outputs). Direct connection eliminates phase drift associated with external sensing coils, simplifying modular DIN rail integration within HT distribution cabinets. Conversely, industrial panels exceeding 100A continuous draw require external split-core or solid-core CTs with programmable conversion ratios (5:5A up to 6000:5A), requiring bidirectional vector integration to ensure inductive and capacitive reactive quadrant metrics (kvarh) remain mathematically coherent.
| Architecture Type | Rated Voltage (Un) | Current Rating (Ib/Imax) | Harmonic Distortion Tolerance | Communication Protocol | Typical Industrial Deployment |
|---|---|---|---|---|---|
| Direct DIN Rail 3P4W | 3×230/400V AC (±20%) | 5(63)A / 10(100)A | Up to 31st Harmonic (THD-V < 5%) | RS-485 Modbus RTU / M-Bus | Sub-tenant billing, commercial HVAC clusters, EV wallboxes |
| CT-Operated Industrial 3P3W/3P4W | 3×57.7/100V ... 3×240/415V | 1.5(6)A (Ext. /5A or /1A CT) | Up to 63rd Harmonic Individual FFT | Modbus-TCP, BACnet/IP, MQTT IoT | Utility feeder incomers, manufacturing plants, data centres |
| Hybrid Smart PV 3P Bi-Directional | 3×230/400V AC Auto-sense | 0.5–10(80)A Bi-Directional | IEC 61000-4-7 Class I Compliant | WiFi / BLE / Zigbee / RS-485 | Solar PV export-limiting, battery storage (BESS), microgrids |
Dynamic Reactive Measurement: Four-Quadrant Analysis
Commercial tariffs penalize low power factor. Zhejiang TMB Electric's meters capture apparent energy (kVAh), active energy import/export (+kWh / -kWh), and four-quadrant reactive energy (Inductive/Capacitive Import/Export). True Root Mean Square (TRMS) sampling rates up to 6.4 kHz ensure that high crest-factor waveforms from silicon-controlled rectifiers (SCR) do not distort the active energy register.
Strategic Sourcing
Future Procurement Trends in Three Phase Metering (2025–2030)
Shifting grid codes, renewable integration, and edge intelligence are transforming how electrical engineering EPCs and distribution distributors source energy monitoring hardware.
Net-Zero Bi-Directional Metering
Global demand is pivoting toward meters that natively measure dual-flow net metering (solar PV generation versus grid absorption). Procurement requirements mandate sub-second zero-export communication to hybrid inverters via closed-loop RS-485 Modbus registers to avoid grid injection fees.
IoT Convergence & Direct Cloud Telemetry
Traditional pulse-output meters are rapidly being replaced by embedded wireless solutions. Wholesalers are sourcing three-phase meters integrated with WiFi, BLE mesh, and cellular NB-IoT, enabling native connection to energy dashboards without needing external PLC gateways.
On-Board Anti-Tampering & Security
Energy theft remains a primary loss factor for municipal sub-grids. Modern engineering specifications demand hardware-level neutral line missing detection, reverse current locking, optical port tamper alerts, and encrypted firmware handshakes to prevent field register manipulation.
Direct From Manufacturer
24 Years of Low-Voltage Engineering & Verified Manufacturing Authority
Operating from Huabei Village, Liushi Town, Wenzhou—China's electrical engineering capital—Zhejiang TMB Electric Co., Ltd. provides specialized OEM/ODM manufacturing of circuit protection, power switching, and smart metering devices. We combine localized access to high-grade phosphor bronze stamping, silver contact fabrication, and flame-retardant PC polymers with comprehensive on-site third-party quality oversight.
Our 5,700 m² plant has undergone rigorous on-site facility verification by TÜV Rheinland, proving our engineering depth, workforce capability (92 verified technical specialists), and testing infrastructure. Products feature CE marking, supported by independent test certificates for rapid regulatory customs clearance.
TÜV Rheinland Assessed Facilities
Low Trial MOQ: Starting from 5 Pcs
OEM Laser Marking & Packaging
Over US$ 3.3M Annual Verified Export
Traceable Material Calibration
Precision digital testing benches verify thermal and electromagnetic parameters across every batch before sub-assembly release.
Standardized Modular Assembly
Automated assembly lines provide controlled terminal torque, standardized copper plating, and rigid dimensional fidelity.
Documented CE & ISO Compliance
Complete compliance documentation: CE declarations, LVD/EMC test dossiers, and factory quality audit reports supplied per order.
Procurement FAQ
Frequently Asked Questions by Industrial Sourcing Teams
Direct technical answers regarding factory compliance, customization thresholds, accuracy certification, and global shipping policies.
What is the metrological difference between Class 1.0 and Class 0.5S three-phase meters?
Under IEC 62053-21, a Class 1.0 meter maintains an active energy accuracy within ±1.0% across 10% to 100% of its rated current. A Class 0.5S meter (IEC 62053-22) is calibrated specifically with "Special" (S) designation down to 1% of rated current, maintaining an error band under ±0.5%. Class 0.5S is mandatory for utility interconnect points, primary commercial billing, and high-draw industrial power distribution.
How does Zhejiang TMB Electric handle factory audits and international shipments?
Our 5,700 m² manufacturing plant in Liushi Town, Wenzhou is verified on-site by TÜV Rheinland. Overseas buyers can download the complete audit report detailing staff capacity, production tooling, and testing facilities. For shipments, we operate direct container consolidation via Ningbo and Shanghai ports, handling FOB, CIF, or DDP terms with complete export declaration paperwork.
Can your three phase meters integrate into existing SCADA or building management systems (BMS)?
Yes. Our intelligent metering lines come equipped with isolated RS-485 serial ports supporting the open Modbus-RTU standard (configurable baud rates from 1200 bps to 19200 bps). Standard register maps provide immediate polling of Phase Voltages (V1, V2, V3), Line Currents (I1, I2, I3), Active Power (P), Reactive Power (Q), Frequency (Hz), Power Factor (PF), and Cumulative Active/Reactive kWh registers.
What is your minimum order quantity (MOQ) and lead time for private-label OEM?
Standard catalog models feature a trial MOQ starting at just 5 pieces to support engineering validation and pilot testing. Custom OEM solutions (including custom laser-etched front panels, private brand packaging, specialized current rating calibrations, and modified Modbus address presets) generally start at 200–500 pieces, with production runs completed in 15 to 25 business days.
Why is True RMS measurement critical when selecting three-phase meters?
Non-True RMS meters measure peak values and calculate RMS based on a pure sinusoidal waveform. However, modern facilities host severe non-linear loads (LED drivers, computer power supplies, variable speed drives, solar inverters) that distort current waveforms into non-sinusoidal shapes. True RMS calculation digitally samples the actual instantaneous waveform thousands of times per second, preventing energy under-counting or over-billing errors.