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. This action causes the latch to open, breaking the main contact and interrupting the current flow. In contrast, the undervoltage release works in the opposite way. When the voltage is stable, the electromagnetic force keeps the armature engaged, allowing the main contact to remain closed. If the voltage drops significantly or the power is cut off, the electromagnetic force weakens, releasing the armature and opening the main contact. To restore power after a voltage loss, the switch must be manually reset, providing essential voltage loss protection.
Common air circuit breaker models include DZ10, DZ15, DZ20, DW10, DW15, DWX15, DW17, DZX10, and DZ25. These are widely used in various electrical systems for their reliability and performance.
Miniature circuit breakers (MCBs) such as DZ12-60C45N and DZ47 are commonly used in residential and light commercial applications due to their compact size and precise tripping characteristics.
Currently, many households use DZ series air switches. The more common specifications include C16, C25, C32, C40, C60, C80, C100, and C120. The letter "C" denotes the trip current, which is the starting current at which the circuit breaker will activate. For example, a C32 circuit breaker will trip when the current reaches 32 amps. A typical 6500W water heater would require a C32 rating, while higher-power units like 7500W or 8500W heaters may need a C40 circuit breaker for safe operation.
In the industry, standard models for power circuits often include types like DW and DZ, available in ratings such as 20A, 32A, 50A, 63A, 80A, 100A, 125A, 160A, 250A, 400A, 600A, 800A, 1000A, and more. These are used in industrial and large-scale electrical distribution systems.
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