High Breaking Capacity 1600A Air Circuit Breaker (ACB) - China Suppliers & Factory Solutions

Normal Operating and Installation Conditions

• Ambient air temperature: The upper limit shall not exceed +55°C, and the lower limit shall not be lower than -5°C.
• Altitude: The altitude of the installation site shall not exceed 2000m. Reference can be made to the high-altitude derating coefficient.
• Atmospheric conditions: When the ambient air temperature is +55°C, the relative humidity of the air shall not exceed 50%. At lower temperatures, higher humidity is allowed. For example, at +20°C, it can reach 90%. Special measures shall be taken for condensation occasionally generated due to temperature changes.
• Pollution level: Level 3.
• Installation category: The installation category of the main circuit (including the under-voltage release coil) is Category IV; the control circuit and auxiliary circuit are Category III.
• Installation conditions: The circuit breaker shall be installed as required by the instruction manual, and the vertical inclination of the circuit breaker shall not exceed 5°.
• Installation protection class requirements: IP30, IP40 (installed in the cabinet compartment, with additional door frames and organic glass covers).
• Service category: B

Product Features

• The contact system is installed in the insulation part compartment. Each phase contact system adopts a multi-path sheet-like structure, realizing electric force compensation and ensuring the high breaking capacity of the circuit breaker.
• The advanced arc-extinguishing system and protective cover ensure "zero flying arc", making the product safer.
• The circuit breaker is operated by an energy-storage mechanism for energy storage, with a fast closing speed.
• The operating mechanism is installed in the center of the front of the circuit breaker, completely separated from the main circuit. It can make each phase have a stable and consistent final contact pressure, which plays an important role in ensuring temperature rise and breaking indicators.
• The centered operating mechanism is convenient for symmetrical hole-opening in the center of the cabinet door of the complete set, improving the appearance quality of the complete set of cabinets.
• It can be installed with bottom incoming lines, and has horizontal and vertical wiring methods.
• Intelligent controller with multiple protection functions, enabling selective protection.

Model and Description

Product Structure

The circuit breaker has a compact structure, small volume, and features three-dimensional separation. The contact system is enclosed in an insulated base and bottom plate with a partition structure. Each phase contact is separated to form individual small chambers. The intelligent controller, operating mechanism, handle, and motor operating mechanism are arranged in sequence in front of it to form independent units.

1. Fixed-type Circuit Breaker

The fixed-type circuit breaker consists of the circuit breaker body and fixed installation side plates. The fixed installation side plates are used to install and fix the relative position of the circuit breaker in the switch cabinet.

2. Structure Diagram of Fixed-type Circuit Breaker

Intelligent Controller

Power Supply Conditions for Normal Operation of the Intelligent Controller:

The working power of the intelligent controller is supplied by current transformers and an auxiliary power supply. To ensure reliable operation at small currents and reliable breaking in case of faults, a dual-power simultaneous supply method is adopted, as follows:

1. Circuit Breaker CT Power Supply

Power is supplied through the current transformer (CT) inside the circuit breaker. The normal working conditions of the controller are as follows: For the M-type controller (2000A frame circuit breaker): When the rated current In of the circuit breaker is greater than 400A, the single-phase primary current of the main circuit is not less than 0.8In, and the three-phase primary current is not less than 0.4In; when In = 400, the single-phase primary current is not less than 1.0In, and the three-phase primary current is not less than 0.6In.

2. Auxiliary Power Supply

Terminals 1 and 2 of the controller are for the auxiliary power supply. The normal working condition of the controller is (85% - 110%) Ue. AC or DC power supply voltages: AC230V, AC400V, DC220V, DC110V. When connecting the power supply, connect to the power supply suitable for the controller. When using functions such as ground protection, communication, thermal memory, or requiring the circuit breaker to maintain input and output signals in the open state, an auxiliary power supply must be equipped.

3. Panel Power Supply

For the M-type controller, power can also be connected through the DC24V power terminal on the panel. It is used when there is no power in the grid or during no-load operation, and the controller has no power supply, to check the controller (normal status, parameters, etc.). Voltage at the test port: DC24V ± 5%.

Basic Functions

Basic Protection Functions and Characteristics of the Intelligent Controller

Overload Long-delay Protection Characteristics

Characteristic Curves

• (1) Standard Inverse Time-Limit (SI)
• (2) Very Inverse Time-Limit (VI)
• (3) Extremely Inverse Time-Limit (Distribution Protection) (EI (G))
• (4) Extremely Inverse Time-Limit (Motor Protection) (EI (M))
• (5) High-Voltage Fuse Compatibility (HV)
• (6) I²t Curve

Short-circuit Short-delay Protection Characteristics

M Intelligent Controller

Short-circuit Instantaneous Protection Characteristics