Overview

The DW45 Series Intelligent Universal Circuit Breaker (hereinafter referred to as “the circuit breaker”) is suitable for distribution networks with AC 50 Hz, rated voltage of 400 V and 690 V and rated current of 630 A to 6,300 A, and is used for power distribution, so as to protect circuits and power equipment from faults such as overload, undervoltage, short circuit, and single-phase grounding. The circuit breaker has the functions of intelligent protection and isolation. It has accurate selective protection, which can improve the reliability of power supply and avoid unnecessary blackout. The circuit breaker is equipped with an open communication interface to realize telemetering, telesignaling, telecontrol and teleregulation, thus meeting the requirements of the centralized control of the automation system.

The circuit breaker complies with GB 14048.2 Low-voltage Switchgear and Controlgear — Lowvoltage Circuit Breakers and IEC 60947-2 Low-voltage Switchgear and Controlgear — Part 2: Lowvoltage Circuit Breakers.

Normal Operating Conditions

1. Ambient air temperature: The upper limit of ambient air temperature shall not exceed +40°C, the lower limit shall not be lower than -5°C, and the average value within 24 hours shall not exceed +35°C.

Note:

(1) The operating conditions with the lower limit of -10°C or -25°C shall be declared to the manufacturer by the user when ordering.

(2) If the upper limit exceeds +40°C or the lower limit is lower than -25°C, the user shall consult with the manufacturer.

2. Altitude: The altitude of the installation location shall not exceed 2,000 meters.

3. Atmospheric conditions: The relative atmospheric humidity does not exceed 50% when the maximum temperature is +40°C, and a higher relative humidity is allowed at a lower temperature. For example, the humidity is 90% at 20°C, and special measures shall be taken for occasional condensation due to the temperature change.

4. Contamination grade: Grade 3.

5. Installation category: The installation category of the breaker’s main circuit, undervoltage release’s coil and primary coil of the power transformer is IV, and that of other auxiliary circuits and control circuits is III.

6. Use category: Class B.

7. Installation conditions: The circuit breaker shall be installed according to the installation requirements of this instruction. The circuit breaker shall be installed smoothly without additional mechanical stress, so as to avoid damage to the circuit breaker or poor contact of the main busbar.