The automatic reclosing intelligent three-phase residual current action circuit breaker integrates traditional circuit breakers (fuses), contactors, overload (or overvoltage, leakage, etc.) protection relays, starters, isolators and other main functions. It has remote automatic control and local direct control functions, panel display and signal alarm functions, overvoltage protection, undervoltage protection, overcurrent protection, leakage protection and other functions. It has the advantages of small size, high reliability, strong short-circuit breaking ability, and short arcing distance. Suitable for low voltage power grids with three-phase four wire neutral point direct grounding TT grounding system. Used to provide indirect contact protection against the risk of electric shock to individuals, as well as to protect against grounding faults, overcurrent, short circuits, and other electrical faults in circuits or usage.
Product Features
◇ Power parameter measurement function: Real time measurement of voltage, current, and leakage current data of power supply lines.
Multi functional protection function: It has multiple protections such as leakage, overvoltage, undervoltage, overcurrent, short circuit, etc.
◇ Remote monitoring function: With RS485 communication interface, it can achieve remote control and intelligent centralized management.
Fault inquiry function: manual inquiry/software inquiry of the last 10 fault phenomena.
Event recording function: Record the cumulative number of failures; The last 10 fault phenomena and fault values.
◇ Automatic reclosing: After recovering from leakage, overvoltage, and undervoltage faults, it can automatically reclose.
Model and its meaning

Panel functions, appearance, and installation dimensions

Appearance and installation dimensions Unit: mm

Technical Parameter
Rated working voltage Un: AC 3x220/380V 50Hz
Rated working current le: can be set arbitrarily within the allowable range shown in the table below.

Automatic reclosing time: 20-60 seconds
● Leakage protection function
The rated residual operating current setting value l Δ n: 50~990mA can be set, with a step difference of 10mA, and the factory default is 500mA
Rated residual non operating current l Δ no:=0.8l Δ n
Maximum breaking time of rated residual operating current:<0.5 seconds
Leakage fault action mode: optional
The fault of phase interruption/loss can be selected by the user: optional
After the leakage fault is restored, it can automatically reclose.
● Overcurrent protection function
Overcurrent inverse time delay protection curve code: 1~6, factory default is 1
Overcurrent fault action mode: optional
Overcurrent fault does not automatically reclose.
Delay action schedule for overcurrent inverse time limit fault:

Note: lw in the table represents the working current, and ln represents the rated operating current.
Overcurrent inverse time delay protection curve diagram

● Short circuit protection function:
Short circuit fault mechanical thermal protection
Short circuit fault does not automatically reclose.
● Protection against phase loss, undervoltage, and overvoltage:
Undervoltage protection value: Factory default is 176V
Overvoltage protection value: Factory default is 264V
Voltage fault action mode: optional
Voltage fault can be selected by the user: optional
After the voltage fault is restored, it can automatically reclose.
basic function






remote management system
overview
After the rural power grid renovation, the residual current operated circuit breakers were changed from being managed by village electricians to being uniformly managed by the power supply station. The jurisdiction is large, and traditional residual current operated circuit breakers are often difficult to manage, unable to timely handle line faults and affecting the continuity of power supply.
In response to this situation, our company has developed the XM3L residual current operated circuit breaker remote management system XMTZ1 intelligent communication terminal. The system is based on a microprocessor and applies GSM mobile communication technology to effectively detect and manage residual current operated circuit breakers in the power grid. Real time monitoring and analysis of communication terminals and residual current operated circuit breakers, and notification to managers via SMS when residual current operated circuit breakers trip due to faults. The terminal also has communication functions such as LCD display, automatic detection, fault alarm, and remote control.
Suitable for low-voltage power grids with three-phase four wire neutral point direct grounding (TT grounding system). Used to provide indirect contact protection against the risk of electric shock to individuals, as well as to protect against grounding faults, overcurrent, short circuits, and other electrical faults in circuits or usage.
Product Features

Remote Management Diagram