Under normal operating conditions, the armature of the overcurrent release remains in its released position. However, when a severe overload or short circuit occurs, the coil connected in series with the main circuit generates a strong electromagnetic force that pulls the armature downward, causing the latch to disengage and breaking the main contact. This action effectively interrupts the electrical circuit.
The operation of the undervoltage release is the opposite. When the voltage is stable, the electromagnetic force keeps the armature attracted, allowing the main contact to remain closed. If the voltage drops significantly or the power is cut off, the magnetic force weakens, releasing the armature and opening the main contact. To restore power after a voltage drop, the switch must be manually reset, providing essential voltage loss protection.
Commonly used air circuit breaker models include DZ10, DZ15, DZ20, DW10, DW15, DWX15, DW17, DZX10, and DZ25. These are widely used in both industrial and residential applications due to their reliability and versatility.
Miniature circuit breakers (MCBs) such as DZ12-60C45N and DZ47 are commonly used for smaller circuits, offering precise overcurrent protection for household appliances and lighting systems.
Currently, many households use air switches from the DZ series. Some less common specifications include C16, C25, C32, C40, C60, C80, C100, and C120. The letter "C" in these designations refers to the tripping current—the starting current at which the breaker activates. For example, a C32 breaker will trip when the current exceeds 32 amps. A typical 6500W water heater would require a C32 breaker, while higher-power units like 7500W or 8500W may need a C40 model for safe operation.
In the industry, standard models often include DZ and DW types with ratings such as 20A, 32A, 50A, 63A, 80A, 100A, 125A, 160A, 250A, 400A, 600A, 800A, and 1000A. These are typically used in power distribution systems where higher current capacity is required.
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