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 specializes in smart lightning protection and electrical safety, offering a product portfolio covering lightning protection, lightning online monitoring, lightning protection online monitoring, lightning arrester, intelligent lightning arrester, lightning arrester monitoring, grounding resistance, grounding monitoring for smart lightning protection scenarios, while addressing digital distribution, smart distribution, electricity meter, carbon neutral, industrial internet, carbon asset for digital business, helping enterprises achieve safe, efficient and low-carbon energy management.