Overview

NM1RL series automatic reclosing residual current action circuit breaker (referred to as coincident leakage circuit breaker) is a newly developed product of our company. It is an integrated, multi-functional, intelligent main circuit current programmable intelligent circuit breaker. Low-voltage power grid for low-voltage three-phase four-wire neutral point direct grounding (TT) of distribution transformers, used to provide indirect contact protection for personal electric shock hazard, ground fault, over current, short circuit to line or electrical equipment Wait for protection.

Model meaning

Features

● High-performance 8-bit microprocessor for real-time signal processing and intelligent control;

●Support C liquid crystal Chinese display and D digital display two display modes, friendly man-machine interface and easy operation;

● Residual current protection, automatic gear setting, with reclosing function;

● Long delay, short delay and instantaneous three-stage protection, using electronic tripping, independent of auxiliary power supply;

● Over-voltage protection, phase loss protection, mutation protection, etc., and re-closing function after recovery;

● Real-time display of line residual current, three-phase power supply voltage and load current;

● Protection function and parameter setting and opening are disabled;

● Monitor and record a large amount of data to facilitate maintenance and repair;

● With communication function, the product meets the standard: DL/T 20-Remaining current protector communication protocol;

Function Description

1)Automatic reclosing

When the residual current exceeds the action current value, the gear trip will automatically reclose after 20-60 seconds, but the manual switch is not limited by time. If the fault current is eliminated within 3 minutes after closing, the closing is successful and the circuit breaker is running normally. If the fault current is not eliminated, the circuit breaker trips again and is locked, and will not automatically reclose. The switch must be manually operated.

2) Protection function

1) Overvoltage protection function

When the line phase voltage is higher than the set value, the circuit breaker protection trips after a 5 second delay. When the line voltage returns to normal voltage, the circuit breaker can be automatically closed and put into operation. Overvoltage protection settings range from 220-350V steps: 1V; users can also set protection on or off by themselves.

2 undervoltage protection

When the line phase voltage is higher than the set value, the circuit breaker protection trips after a delay of 5 seconds. When the line voltage returns to the normal voltage, the circuit breaker can be automatically closed and put into operation. The undervoltage protection setting value ranges from 150. -220V step: 1V; users can also set their own protection to enable or disable.

3 phase loss protection

When the line power supply outlet is out of phase, the circuit breaker protection trips. When the line voltage returns to normal voltage, the circuit breaker is reclosed. The phase loss protection setting range is 80-150V, the step size is 1v, and the user can also set the protection on or off.

Technical Parameters

Shape and installation dimensions