FA Arc-Fault Monitor
FA / FAP Series
Compliant with UL 1699B, early identification of arc faults, combining with the AI analysis system for hidden-risk identification and confidence scoring.
Product Overview
The SFA multi-factor electrical intelligent measurement and control unit is a multi-factor integrated intelligent measurement and control terminal developed by FEXLINK for energy management and electrical safety monitoring. It integrates collection, control, communication, and management in one unit, with gateway capabilities, and can be mounted on a 35mm standard DIN rail inside electrical control cabinets, distribution cabinets, or on the outside of monitored equipment. Standard configurations include full electrical parameter measurement of three-phase voltage, three-phase current, active/reactive power, power factor, system frequency, and active/reactive energy, with support for time-of-use metering of forward/reverse active and reactive energy; optional 0-31st harmonic analysis and three-phase unbalance dynamic monitoring functions; it also supports 4 temperature channels, 1 temperature and humidity channel, 1 residual current channel, 2 digital inputs, and 2 relay outputs. With matching dedicated transformers, it covers a current monitoring range of 5A~1000A (expandable up to 6000A), RS485/4G/RJ45 multi-communication access to the cloud platform, and an OLED high-definition screen for convenient local debugging and inspection.
Core Capabilities
Full electrical parameter measurement: three-phase voltage/current/power/power factor/frequency/energy with 0.2S class energy accuracy. Power quality analysis: 0-31st voltage/current harmonic component measurement and three-phase unbalance dynamic analysis. Multi-factor monitoring: 4 temperature channels + 1 temperature and humidity channel + 1 residual current channel + 2 digital inputs + 2 relay outputs. Wide-range adaptation: with dedicated sensors covering a 0-6000A current range, for cable/busbar applications. Product Features
Data Generated
Product Features
Complete Monitoring and Collection Functions
Three-phase full electrical parameter measurement, time-of-use metering of forward/reverse active and reactive energy, 4 temperature channels + 1 temperature and humidity channel + 1 residual current channel + 2 digital inputs + 2 relay outputs - one device meets multi-dimensional monitoring needs.
Power Quality Analysis
Supports 0-31st voltage/current harmonic component measurement and three-phase unbalance dynamic analysis, achieving unbalance monitoring and intelligent statistical analysis at each phase angle (optional function).
High-Precision Metering
Active energy accuracy defaults to Class 0.5, with monitoring accuracy up to Class 0.2S, meeting energy management requirements and working with backend software for time-of-use metering and energy consumption analysis.
Multi-Channel Temperature Monitoring
Supports 4 NTC temperature sensor channels for contact temperature monitoring and analysis, plus 1 temperature and humidity channel to track environmental changes in real time.
Residual Current Monitoring
Supports 1 residual current monitoring channel with a 10~3000mA range and Class 1 accuracy, enabling dynamic leakage detection to eliminate electrical hazards.
Linked Control
Supports 2 relay outputs (AC250V/3A, DC30V/3A) for easy threshold-based or custom linked control, enabling automatic response to anomalies.
Multi-Communication Integration
Two RS485 ports + one RJ45 port, with 4G, Zigbee, and LoRa expansion support, standard Modbus RTU protocol with MQTT support, integrating collection, control, communication, and management with gateway capabilities.
OLED Local Display
High-definition OLED screen + physical buttons for easy local data display and product configuration, convenient for debugging and inspection; an optional HMI screen supports building a fully localized monitoring strategy.
Multi-Module Expansion
Supports access to multiple monitoring modules including power quality, three-phase unbalance, smart meters, equipotential, electrical fire, leakage, digital input, lightning protection, lightning current, and grounding resistance. Selection Guide
System Topology
Selection Guide
Model Naming Rules
SFA - 1 0 0 1 1 - GR SFA Product category Multi-factor electrical intelligent measurement and control unit, meter model 1 Meter function 0: none; 1: available 0 Three-phase balance function 0: none; 1: available 0 Harmonic monitoring function 0: none; 1: available 1 Electrical fire function 0: none; 1: available 1 Inputs and outputs 1: 2 relay outputs + 4 digital inputs G Uplink communication method E: Ethernet; G: 4G R Downlink communication method R: RS485 Model Digital inputs Relay outputs Meter monitoring Phase monitoring Harmonic monitoring Downstream RS485 Uplink WAN Uplink 4G SFA-10011-ER 4 2 Supported Not supported Not supported Two channels Supported -- SFA-10011-GR 4 2 Supported Not supported Not supported Two channels -- Supported Current transformer selection (ZCT) Model: ZCT-9(C)-5/0.5 - Inner diameter: 9.5/16/24/36/50mm - Application: C cable / B busbar - Current: 5~1500A - Accuracy: Class 0.2/0.5/1.0 Residual current transformer (ZRCT) Model: ZRCT-45(C)/0.5 - Inner diameter: 30/45/65/80/100/150mm - Application: C cable / B busbar - Accuracy: Class 0.2/0.5/1.0 Temperature sensor (ZTS) Model: ZTS-01 - 01: NTC temperature sensor - 02: digital temperature chip sensor - Monitoring range: -30~125℃ - Accuracy: ±1℃ ZCT
| Model | Digital inputs / Relay outputs / Meter monitoring / Phase monitoring / Harmonic monitoring / Downstream RS485 / Uplink WAN / Uplink 4G |
| SFA-10011-ER | 4 / 2 / Supported / Not supported / Not supported / Two channels / Supported / -- |
| SFA-10011-GR | 4 / 2 / Supported / Not supported / Not supported / Two channels / -- / Supported |
Current Transformer Selection Chart
With dedicated current transformers covering a 5A~1000A current range, supporting cable/busbar applications with optional Class 0.2/0.5/1.0 accuracy. Rated value 5A 100A 200A 400A 600A 1000A Current ratio 5A/0.33V 100A/0.33V 200A/0.33V 400A/0.33V 600A/0.33V 1000A/0.33V Aperture 16mm 24mm 24mm 36mm 36mm 36mm 5A 100A 200A 400A 600A 1000A ZRCT
| Rated value | 5A / 100A / 200A / 400A / 600A / 1000A |
| Current ratio | 5A/0.33V / 100A/0.33V / 200A/0.33V / 400A/0.33V / 600A/0.33V / 1000A/0.33V |
| Aperture | 16mm / 24mm / 24mm / 36mm / 36mm / 36mm |
Residual Current Transformer Selection Chart
Inner diameter 30/45/65/80/100/150mm optional, supporting cable/busbar applications with Class 0.2/0.5/1.0 accuracy and a 10~3000mA monitoring range. ZTS
Temperature Sensor Selection Chart
NTC temperature sensor (ZTS-01) and digital temperature chip sensor (ZTS-02) are optional, with a -30~125℃ monitoring range and ±1℃ accuracy. Technical Parameters
Technical Parameters
Basic Parameters
Operating voltage AC 180~250V (220V) Power consumption ≤2W Operating temperature -20℃~60℃ Operating humidity <95% Product weight 260g Dimensions 107×88×63mm (L×W×H) Housing material Thermoplastic material UL94V0 Protection rating IP20 Installation method Standard 35mm DIN-rail mounting Display OLED high-definition screen
| Operating voltage | AC 180~250V (220V) |
| Power consumption | ≤2W |
| Operating temperature | -20℃~60℃ |
| Operating humidity | <95% |
| Product weight | 260g |
| Dimensions | 107×88×63mm (L×W×H) |
| Housing material | Thermoplastic material UL94V0 |
| Protection rating | IP20 |
| Installation method | Standard 35mm DIN-rail mounting |
| Display | OLED high-definition screen |
Monitoring and Communication Parameters
Communication RS485 / 4G / RJ45 Communication protocol Modbus RTU / MQTT Voltage monitoring Rated 220V/380V, accuracy Class 0.5/0.2S Current monitoring 5A/100A/200A/400A/600A/1000A, accuracy Class 0.5 Frequency 45~65Hz, accuracy 0.01Hz Active energy accuracy Class 0.5/0.2S Reactive energy accuracy Class 2 Residual current 10~3000mA, accuracy Class 1 Temperature monitoring -30~125℃, ±1℃ Humidity monitoring 0~100%RH, ±2%RH Digital inputs 4 dry contact inputs with built-in power supply Relay outputs 2 normally open contacts, AC250V/3A, DC30V/3A Installation Instructions
| Communication | RS485 / 4G / RJ45 |
| Communication protocol | Modbus RTU / MQTT |
| Voltage monitoring | Rated 220V/380V, accuracy Class 0.5/0.2S |
| Current monitoring | 5A/100A/200A/400A/600A/1000A, accuracy Class 0.5 |
| Frequency | 45~65Hz, accuracy 0.01Hz |
| Active energy | Accuracy Class 0.5/0.2S |
| Reactive energy | Class 2 |
| Residual current | 10~3000mA, accuracy Class 1 |
| Temperature monitoring | -30~125℃, ±1℃ |
| Humidity monitoring | 0~100%RH, ±2%RH |
| Digital inputs | 4 dry contact inputs with built-in power supply |
| Relay outputs | 2 normally open contacts, AC250V/3A, DC30V/3A |
Installation Instructions
a
Installation Diagram
35mm DIN-rail mounting dimension drawing b
Interface Description
Interface diagram Terminal definition Category Terminal Definition Voltage input A1/A3/A5/A7 A/B/C phase voltage input, neutral input Power output 5V/12V/G 5V/12V power output, 0V Current input B1~B6 A/B/C phase current input positive/negative terminals Residual current B7/B8 Residual current input negative/positive terminals RS485 communication E5~E8 RS485-1 master/RS485-2 slave A/B terminals DI input C7/C8/E1/E2 Digital inputs 1~4 (connect to GND) Temperature C1~C6 NTC temperature 1~4 inputs, GND Relay outputs D1/D2/D4/D5 Output 1/Output 2 terminals Meter calibration E3/E4 Meter calibration input positive/negative terminals
| Category | Terminal / Definition |
| Voltage input | A1/A3/A5/A7 / A/B/C phase voltage input, neutral input |
| Power output | 5V/12V/G / 5V/12V power output, 0V |
| Current input | B1~B6 / A/B/C phase current input positive/negative terminals |
| Residual current | B7/B8 / Residual current input negative/positive terminals |
| RS485 communication | E5~E8 / RS485-1 master/RS485-2 slave A/B terminals |
| DI input | C7/C8/E1/E2 / Digital inputs 1~4 (connect to GND) |
| Temperature | C1~C6 / NTC temperature 1~4 inputs, GND |
| Relay outputs | D1/D2/D4/D5 / Output 1/Output 2 terminals |
| Meter calibration | E3/E4 / Meter calibration input positive/negative terminals |
Key Points
Definition: The SFA multi-factor electrical intelligent measurement and control unit is a core product of the FEXLINK cloud-edge intelligent control series, integrating monitoring capabilities for multiple electrical and status quantities. Core capabilities: supports multi-factor collection of residual current, temperature, voltage, current, power, and energy, with built-in transformer selection guidance and RS485/MQTT upload. Applicable scenarios: smart upgrading of distribution cabinets, comprehensive energy and safety monitoring of commercial complexes, and power measurement and control in industrial plants. Related products: ESA electrical safety monitoring terminal, ZSA embedded multi-function meter, ESX intelligent edge computing gateway.
FAQ
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