Overview
■ The DLM1C Series Smart Molded Case Circuit Breaker with Auto-Reclosure Function (hereinafter referred to as the “circuit breaker”) is a leakage circuit breaker that integrates a residual current protection device and a molded case circuit breaker, featuring an auto-reclosure function.
■ It is designed for AC 50Hz, rated working voltage AC 400V, three-phase, four-wire systems with a grounded neutral point. The circuit breaker provides protection against ground faults, overcurrent, short circuits, phase loss, and overvoltage for electrical lines or equipment. It also prevents electrical fires and equipment damage caused by ground faults and offers indirect protection against electric shock hazards. (This product is available in both economy and standard models.)
■ The overcurrent trip unit of the smart molded case circuit breaker is electronic, and the rated current can be adjusted based on the load conditions of the circuit. The breaker offers three adjustable protection curves and can be coordinated with downstream breakers for tiered protection. The electronic overcurrent trip unit provides high protection accuracy with minimal impact from environmental temperature and installation location, serving as an upgraded version of the traditional thermal-magnetic overcurrent trip unit.
■ The molded case smart circuit breaker is equipped with an R5485 serial interface, allowing protection characteristic parameters to be set via a programmer, while also meeting communication networking requirements.
Working Conditions & Installation Conditions
◎ Ambient Temperature: -15°C to +40°C, with the daily average maximum not exceeding +35°C. If the temperature exceeds +40°C or drops below -5°C, consult the manufacturer.
◎ Installation Conditions: The external magnetic field should not exceed five times the Earth’s magnetic field in any direction. The installation site should be free from conductive dust, corrosive gases, and flammable/explosive gases. Ensure no rain, snow, or direct sunlight on the device. Adequate ventilation and heat dissipation are required.
◎ Pollution Degree: Pollution degree 3.
◎ Relative Humidity: When the average minimum temperature of the wettest month is ≤ 25°C, the maximum average relative humidity should not exceed 90%. Special measures are needed for occasional condensation due to temperature changes.
◎ IInstallation Location: Altitude should not exceed 2000 meters. For higher altitudes, consider reduced dielectric strength and cooling efficiency.
◎ Installation Category: Category III.
◎ Power Supply: The harmonic distortion of the power supply sine wave should be less than 5%.
Product Features
■ Comprehensive Protection Features: The circuit breaker integrates overload protection, short circuit protection, phase loss protection, overvoltage/undervoltage protection, residual current protection, power-side neutral protection, leakage alarm, and auto-follow-up protection. This ensures reliable switching operations and minimizes the occurrence of faults.
■ Intelligent Circuit Design: The intelligent control circuit, based on a microcontroller, accurately and real-time measures various operating parameters. In the event of a fault, the breaker will trip quickly, ensuring the safety of both the circuit and personnel. It can be designed to monitor load current, residual current, residual current time delay, and other parameters based on actual requirements. The system can also detect the cause of the fault and display fault parameters during tripping.
■ Retains Protection Settings after Power Loss: The protection values and a series of parameters are not lost after power interruption or shutdown.
■ Convenient Human-Machine Interface: The display interface automatically cycles through parameters such as operating voltage, current, and real-time residual current. Users can easily query the fault parameters and total number of trips for various fault conditions. The circuit breaker also offers both automatic and manual disconnection functions for user convenience in different situations.
■ Compact Shell Design: The combination of residual current relay, AC contactor, and air circuit breaker into a single unit significantly reduces the installation space required in switchgear cabinets and simplifies wiring, saving customers on total product cost.
■ Advanced Remote Communication: Equipped with an RS485 communication interface, the breaker can connect to a computer or remote monitoring screen. It also supports GPRS communication modules for remote control and real-time monitoring via mobile phones, allowing users to control and check the breaker’s status remotely. (For communication functionality, refer to the communication-type manual attached.)
