In power distribution retrofits and new projects, engineers often face a dilemma: achieving high-precision energy and power quality monitoring for three-phase circuits while being constrained by limited panel cutout space and complex wiring conditions. Traditional three-phase meters tend to be bulky, have fixed connections, and lack flexibility in current sensor selection—Rogowski coils, voltage-output CTs, and conventional 5A CTs often require different hardware versions, leading to lengthy selection processes and high inventory costs.

The Roc337 is a standard 96×96mm panel-mount three-phase multi-function energy meter, designed for industrial power distribution, energy monitoring, and power analysis. It features snap‑on tool‑free installation, supports direct connection to Rogowski coils, voltage‑output CTs, and 5A CT inputs, offers multiple power supply options, and integrates advanced functions such as harmonic analysis, demand calculation, and multi‑tariff energy. One meter meets the majority of low‑voltage and medium‑voltage metering applications.

Three Core Advantages: Simplify Complexity

1. Flexible Current Sensor Compatibility – One Model for All Scenarios

The Roc337 is available in two sub‑series: Type N (Rogowski coil and voltage-output CT) and Type C (5A/7A conventional CT input). This means:

• Retrofit projects: No power shutdown or rewiring required – simply clamp the Rogowski coil around cables or busbars, reducing installation time by over 80%.
• New installations: Freely choose sensors according to current range, covering from 5A up to 12,000A.
• Spare parts management: Only 1–2 models need to be stocked to handle most site requirements.

Technical support:

• Rogowski coil input: Supports sensitivities such as 50mV/kA, 85mV/kA, 100mV/kA; measurable current up to 12,000A (50Hz).
• Voltage-output CT input: 0–7A AC.
• Voltage input: Direct connection 0–600VAC (phase voltage), max 720VAC.

2. Standard Panel Cutout + Snap-On Mounting – Fixed in 90 Seconds

The Roc337 uses the industry‑standard 96×96mm panel cutout, fully compatible with existing cabinets, instrument panels, and test benches. The rear features a snap‑on (tool‑free) design – no screws required; just push the meter into the cutout and it locks securely. For panel builders and field engineers, this dramatically reduces assembly time.

• Dimensions: 96×96×45mm (excluding terminal depth)
• Cutout size: 92×92mm, snap‑on fixing
• Weight: only 259g – lightweight yet robust

3. Rich Measurement and Advanced Functions – More Than Just an Energy Meter

The Roc337 not only provides basic three‑phase voltage, current, power, frequency, and power factor data, but also integrates:

• Harmonic analysis: 1st to 50th harmonic percentage and magnitude for voltage and current, including THD, TOHD and TEHD.
• Demand calculation: Fixed or sliding interval; records active, reactive and apparent demand with peak demand timestamp.
• Multi‑tariff energy (6 tariffs): RTC‑scheduled or manual switching, ideal for time‑of‑use billing.
• Phase sequence detection: Automatically identifies incorrect voltage or current phase sequence – instant field feedback.
• 2 digital inputs + 1 relay output + 1 energy pulse output: Easy integration with alarms, pulse counters or remote control.

Accuracy class:

• Active energy/power: IEC 62053‑22 Class 0.5S
• Reactive energy/power: IEC 62053‑21 Class 1S
• Voltage: ±0.2% (60V–600V)
• Current: 0.1% + sensor accuracy
• Frequency: ±0.01Hz

Performance at a Glance: Key Parameters and Their Real-World Benefits

• Active energy Class 0.5S, voltage ±0.2%, current 0.1%+sensor accuracy
  Meets IEC billing-grade accuracy – can be used for electricity cost settlement. High measurement precision ensures credible before/after comparisons for energy‑saving retrofits.
• Rogowski coil measurement up to 12,000A; direct CT input up to 7A
  Covers everything from low‑voltage branch circuits to medium‑/high‑voltage incomers with one meter – drastically reduces spare part types across the plant.
• 1st to 50th harmonic analysis (THD, TOHD, TEHD) with percentage and magnitude
  Quickly identifies harmonic pollution from VFDs, UPS, LEDs and other non‑linear loads – provides basis for filter design and extends transformer/cable life.
• Multiple power supply options: 95–265VAC / 9‑36VDC / 90‑528VAC
  Adapts to different site power standards worldwide – standard industrial AC, low‑voltage DC (instrument cabinets/EV chargers), ultra‑wide AC (mines/outdoor) – no extra power module needed.
• Operating temperature -20℃ to +70℃, storage -40℃ to +85℃, humidity 95% RH
  Reliable in high‑temperature summer switchgear or cold winter outdoor enclosures; resistant to condensation – long‑term maintenance‑free operation.
• EMC highest level: IEC 61000-4-2/4/5 Level IV
  No data corruption or communication interruption in harsh interference environments such as VFD rooms, welding shops or HV switchyards – ensures data integrity.
• 96×96mm standard panel cutout, snap‑on mounting, no screws
  Compatible with all standard meter holes – retrofit without modifying cabinet doors. One person, 90 seconds to secure – dramatically reduces panel assembly man‑hours.
• RS485 Modbus‑RTU, baud rate up to 115200bps
  Direct connection to PLC, SCADA, energy management systems – no additional gateway required. High‑speed communication ensures timely refresh for large data points.
• 6‑tariff energy + demand calculation (fixed/sliding) + phase sequence self‑check
  Supports TOU billing and peak demand charge calculation. Automatic phase sequence warning reduces on‑site commissioning time by more than 50%.
• CAT III 1000V, CE, full IEC 62053 series certification
  Suitable for 277/480V secondary sides and meets international export requirements. Passes rigorous safety tests – protects maintenance personnel.

Typical Applications

1. Low‑Voltage Switchgear – Incomer and Feeder Metering

In factory, commercial building and data center LV rooms, the Roc337 mounts directly on cabinet doors or instrument panels. Non‑invasive Rogowski coils (no external integrator needed) avoid disconnecting busbars or cables. Data is aggregated via RS485 to power monitoring systems or EMS.

2. Medium‑/High‑Voltage Substation Secondary Side Monitoring

Using voltage transformers (VTs) and current transformers (CTs), the Roc337 can be safely connected to the secondary side of MV/HV systems. Its wide voltage measurement range and programmable PT/CT ratios (via Modbus) make it ideal for substation smart meter retrofits.

3. Power Quality Analysis for Ports, Mines and Heavy Equipment

Large motors, cranes and VFDs generate significant harmonics and unbalance. The Roc337 provides 1st–50th harmonic monitoring, unbalance and demand analysis – helping maintenance staff detect overload or distortion anomalies before unplanned downtime occurs.

4. Tenant Billing and Sub‑Metering in Commercial Buildings

Floor distribution rooms have limited space. The 96×96mm panel size of the Roc337 fits easily. Combined with 6‑tariff capability, it accurately logs tenant consumption by time‑of‑use, supporting compliant utility billing.

Quality and Certifications

The Roc337 is designed and manufactured to meet international standards, with CE and IEC 62053 series certification as well as EN 61010‑1 safety compliance. Its EMC performance reaches Level IV (electrostatic discharge, EFT, surge), ensuring stable operation in complex industrial electromagnetic environments. The wide operating temperature range of -20℃ to +70℃ suits harsh outdoor switchgear environments.

About the Company

We have full in‑house R&D capabilities – from core sensing elements to communication protocol stacks. Our products are widely used in electric power, manufacturing, infrastructure, commercial buildings and renewable energy projects, and we provide ODM and custom solutions to many multinational companies.

We believe that a great meter should deliver accuracy, flexibility and durability at the same time. The Roc337 embodies this philosophy – it turns a panel‑mount energy meter from a simple “number display” into a reliable sentinel for power management.

Start Your Precision Metering Journey Today

Whether you are designing a new panel or retrofitting an old cabinet, the Roc337 helps you reduce costs, shorten lead times and obtain trustworthy energy data with its standard size, versatile sensor compatibility, and fast installation.

Contact our sales team for the Roc337 datasheet, pricing and technical support. We look forward to working with you to build smarter, more efficient energy monitoring networks.