Product overview

Automatic reclosing type intelligent three-phase residual current action circuit breaker integrates the main functions of traditional circuit breaker (fuse), contactor, overload (or over-voltage, leakage, etc.) protection relay, starter, isolator, etc., with remote automatic control and local direct control function, panel display and signal alarm function, with over-voltage protection, under-voltage protection, over-current protection, leakage protection, etc., with Small size, high reliability, strong short-circuit breaking capacity, short flying arc distance and other advantages. It is suitable for low-voltage grids of three-phase four-wire neutral point direct grounding TT grounding systems. It is used to provide indirect contact protection against the risk of personal electric shock and also to protect against earth faults, over-currents and short-circuits in the line or in the use of electricity.

Technical parameters

Automatic reclosing type intelligent three-phase residual current action circuit breaker integrates the main functions of traditional circuit breaker (fuse), contactor, overload (or over-voltage, leakage, etc.) protection relay, starter, isolator, etc., with remote automatic control and local direct control function, panel display and signal alarm function, with over-voltage protection, under-voltage protection, over-current protection, leakage protection, etc., with Small size, high reliability, strong short-circuit breaking capacity, short flying arc distance and other advantages. It is suitable for low-voltage grids of three-phase four-wire neutral point direct grounding TT grounding systems. It is used to provide indirect contact protection against the risk of personal electric shock and also to protect against earth faults, over-currents and short-circuits in the line or in the use of electricity.

Product features

◇Power parameter measurement function: real-time measurement of voltage, current and leakage current data of power supply lines.

◇Multi-functional protection function: with various protection such as leakage, over-voltage, under-voltage, over-current and short-circuit.

◇Remote monitoring function: With RS485 communication interface, it can realize remote control and intelligent centralized management.

◇Fault enquiry function: Manual inquiry/software enquiry for the last 10 fault phenomena.

◇Event recording function: Record the accumulated number of faults; the last 10 fault phenomena and fault values.

◇Automatic reclosing: it can automatically reclose after restoration of leakage, overvoltage and undervoltage faults.

External and mounting dimensions in mm

Technical parameters

Rated working voltage Un: AC 3x220/380V 50Hz

Rated operating current le: Can be set within the permissible range shown in the table below.

Automatic reclosing time: 20~60 seconds

● Leakage protection function

Rated residual action current setting value lΔn： 50~990mA can be set, 10mA step difference, factory default is 500mA

Rated residual non-action current lΔno：=0.8lΔn

Rated residual action current maximum breaking time: <0.5sec

Leakage fault action mode: optional

Breakage/phase failure can be selected by the user: optional

Automatic reclosing after recovery from leakage fault.

● 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.

Overcurrent inverse time limit fault delay action schedule.

Note: lw in the table is the operating current and ln is the rated action current.

Overcurrent inverse time delay protection curve diagram

● Short-circuit protection function:

Short-circuit fault mechanical thermal protection

No automatic reclosing for short-circuit faults.

● Break/phase loss, under-voltage, over-voltage protection:

Undervoltage protection value: 176V by factory default

Overvoltage protection value: 264V by factory default

Voltage fault action mode: optional

Voltage fault can be selected by the user: optional

Voltage fault can be automatically reclosed after recovery.