ESB Three-Phase Unbalance Monitor
Exclusive Zero-Sequence/Negative-Sequence Unbalance Monitoring, Precisely Locating Grid Imbalance Root Causes
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Product Overview
ESB Three-Phase Unbalance Monitor is a smart monitoring terminal dedicated to in-depth unbalance diagnosis in Low-Voltage three-phase distribution systems. It dynamically computes zero-sequence voltage unbalance, negative-sequence voltage unbalance, zero-sequence current unbalance and negative-sequence current unbalance, and provides key indicators such as phase angle and voltage difference for each phase.
The product exclusively decomposes positive-, negative- and zero-sequence components to accurately locate the root cause of grid unbalance. Combined with a proprietary vector computation model, it directly provides 130+ monitoring items covering 17 parameters in 6 categories (voltage, current, power, energy, power factor, phase angle, unbalance, frequency), equivalent to 5 instruments in one.
Core Application Scenarios
- Three-phase unbalance monitoring and mitigation in Low-Voltage distribution cabinets.
- Precision power distribution balancing in data centers.
- Power quality diagnosis and optimization for industrial production lines.
- Smart power distribution O&M for commercial buildings.
Product Features
Deep Unbalance Diagnosis
Exclusive monitoring of zero-sequence and negative-sequence voltage/current unbalance, decomposing positive/negative/zero-sequence components, accurately locating the abnormal phase.
130+ Parameters in One Table
6 categories 17 parameters: voltage/current/power/energy/power factor/phase angle/unbalance/frequency, equivalent to 5 instruments in one.
Industry-Leading Accuracy
Voltage and Current Measurement Accuracy up to Class 0.2, unbalance measurement error <2%, accuracy 10 times stricter than national standard, frequency accuracy 0.01Hz.
Multi-Level Smart Alarm Linkage
Supports 8 alarm types: overvoltage/undervoltage/overcurrent/overpower/voltage unbalance/current unbalance/undercurrent/underpower, "AND/OR" logic programming, alarms on limit violation with automatic linkage.
HD OLED Display
OLED display shows Real-Time three-phase voltage, current and other key parameters, with exclusive unbalance analysis interface, transforming abstract issues into concrete values.
Remote Calibration & Open Data
Supports remote software calibration of current/voltage/power gain, 200+ read/write registers fully transparent, supports deep secondary development.
Selection Guide
Model Naming Rules
| Model | Power Supply | Display | Current Rating | Voltage Rating | DI Inputs | Relay Output | RS485 Modbus |
|---|---|---|---|---|---|---|---|
| ESB-12111-R | DC 5V | OLED | 3×5A | 3×220/380V | 2-ch | 1-ch | Yes |
| ESB-12121-R | DC 5V | OLED | 3×100A | 3×220/380V | 2-ch | 1-ch | Yes |
| ESB-12131-R | DC 5V | OLED | 3×400A | 3×220/380V | 2-ch | 1-ch | Yes |
| ESB-12141-R | DC 5V | OLED | 3×600A | 3×220/380V | 2-ch | 1-ch | Yes |
| ESB-22111-R | AC 220V | OLED | 3×200A | 3×220/380V | 2-ch | 1-ch | Yes |
| ESB-22121-R | AC 220V | OLED | 3×1000A | 3×220/380V | 2-ch | 1-ch | Yes |
| ESB-22131-R | AC 220V | OLED | 3×400A | 3×220/380V | 2-ch | 1-ch | Yes |
| ESB-22141-R | AC 220V | OLED | 3×600A | 3×220/380V | 2-ch | 1-ch | Yes |
* Other electrical parameters include: frequency, power, power factor, etc. For other ranges or communication configurations, please contact sales for customized solutions.
Technical Parameters
Basic Parameters
| Operating Voltage | DC 4.75~5.25V(5V model)/ AC 180~250V(220V model) |
| Power Consumption | ≤ 2W |
| Operating Temperature | -20℃ ~ 60℃ |
| Operating Humidity | < 95% |
| Weight | 150g |
| Dimensions | 36 × 110 × 69mm(L×W×H) |
| Enclosure Material | Thermoplastic UL94V0 |
| Protection Rating | IP20 |
| Mounting | Standard 35mm DIN Rail Mounting |
| Display | OLED |
| Communication | RS485 |
| Protocol | Modbus |
Monitoring Functions
| Voltage (AC) | Rated: 220V/380V; overload: 1.2x Rated continuous, 2x Rated for 1 second; Accuracy: Class 0.5/0.2S |
| Current (AC) | Rated: 5A, 100A, 400A, 600A; overload: 1.2x Rated continuous, 2x Rated for 1 second; Accuracy: Class 0.5/0.2S |
| Frequency | 45~65Hz, accuracy: 0.01Hz |
| Active Energy | Accuracy: Class 1 |
| Reactive Energy | Accuracy: Class 2 |
| Three-Phase Unbalance | Zero-sequence/negative-sequence Voltage/Current unbalance, unbalance measurement error <2% |
| DI Input | Dry contact input, built-in power,2-channel |
| DO Output | Relay output, contact capacity AC250V/3A, DC30V/3A, normally open contact |
Installation Instructions
Installation Dimensions
Sensor Description
The product uses external three-phase current transformers, with different Rated values corresponding to different aperture specifications. Split-core design enables installation without power outage, dedicated high-precision sensors with patented smart locking design ensure high stability in complex environments.
| Rated Value | Current Ratio | Aperture |
|---|---|---|
| 5A | 5A / 0.33V | 16mm |
| 100A | 100A / 0.33V | 24mm |
| 200A | 200A / 0.33V | 36mm |
| 400A | 400A / 0.33V | 36mm |
| 600A | 600A / 0.33V | 36mm |
| 1000A | 1000A / 0.33V | 52mm |
Interface Diagram
Wiring Definition
| Power Supply | 220V: L1 live, N neutral; 5V: 5V positive, GND 0V (alternative) |
| RS485 Communication | A: RS485 A terminal; B: RS485 B terminal |
| DI Input | DI1/DI2: Digital input, the other end connects to GND, direction-independent |
| DO Output | DO1/DO1': Relay output, direction-independent |
| Current Input | IA+/IA-, IB+/IB-, IC+/IC-: Three-phase Current positive/negative terminals |
| Voltage Input | L1/L2/L3: Three-phase Voltage; N: Neutral |
Note: 220V AC input and 5V DC power input are mutually exclusive. Do not connect both simultaneously.
Key Points
- Definition： The ESB Three-Phase Unbalance Monitor is FEXLINK's electrical safety device dedicated to three-phase voltage/current unbalance monitoring.
- Core Capabilities： Real-Time monitoring of three-phase voltage/current amplitude and phase, calculates unbalance factor, triggers threshold alarms, supports RS485 upload.
- Scenarios： Suitable for distribution monitoring of three-phase-sensitive industrial motors, UPS systems and precision equipment.
- Related Products： ESA Electrical Safety Terminal, ESE Power Quality Monitor, SFA Multi-Element Controller.
Frequently Asked Questions
Product FAQ
What is ESB Three-Phase Unbalance Monitor?
The ESB Three-Phase Unbalance Monitor is FEXLINK's electrical safety device dedicated to three-phase voltage/current unbalance monitoring.
What scenarios does ESB Three-Phase Unbalance Monitor apply to?
Suitable for distribution monitoring of three-phase-sensitive industrial motors, UPS systems and precision equipment.
How does ESB Three-Phase Unbalance Monitor differ from traditional solutions?
Compared with ordinary three-phase meters, the ESB focuses on unbalance analysis and alarming, helping O&M teams promptly rebalance loads.
How is ESB Three-Phase Unbalance Monitor installed and integrated?
DIN-rail mount inside the distribution cabinet, connect three-phase voltage/current transformers, and configure thresholds after wiring the RS485 bus.
How can I purchase FEXLINK products or request a demo?
Submit requirements via the Contact page on the FEXLINK website, or call +86-755-8653-6148 to request a demo and selection consultation; engineers will propose a matched solution and quotation based on your scenario.
FEXLINK Business Scope
FEXLINK 微物联，专注配电场景电气安全与数字能源技术研发。我们以多维精准感知与智能算法为核心，通过端侧感知芯片、多维电气时序特征算法、三层电碳大模型，实现雷电防护、接地监测、电气隐患识别；同步完成配电计量、电能质量分析、回路级碳排核算。面向老旧柜体与工业配电，构建从现场采集、本地芯片推理到云端电碳智能中枢的端云协同体系，赋能能源安全管控、能效优化与低碳数字化落地。