In the circuit breaker model, the requirement clearly indicates the type of tripper trip characteristic curve, which is a very important parameter in the circuit breaker model expression. The type of trip is generally indicated before the circuit breaker has additional housing current.
For example, in a circuit breaker with model DZ47-C63/2P 32, the "C" before the additional housing current 63 indicates that the tripper is a C trip characteristic curve. The characteristic curves of the international tripper are: A, B, C, D, a total of four trip characteristics.
In the meantime, characteristic A is generally suitable for the maintenance of semiconductor electronic circuits, measurement circuits with low-power power transformers, or systems with long lines and low currents. In the new version of GB/T 10963.1-2020 "Circuit Breakers for Overcurrent Maintenance in Household and Similar Places for Electrical Accessories Part 1: Circuit Breakers for AC Use", only trippers with B, C, and D characteristics are listed. For example, Table 1 shows the scale of the instantaneous trip of the tripper.
Features are suitable for both purely resistive loads and low inductance lighting circuits. This type of load has a small short-circuit current and is generally used in places with high requirements for home lighting or protection.
cCharacteristics are suitable for inductive loads and high-sensitivity lighting circuits, such as tungsten halogen lamps. Its starting characteristics have a high current value, and it is generally used for distribution line maintenance and lighting loads with high starting characteristics.
d characteristics are suitable for distribution systems with large inductive loads and large impulse currents, such as motors, transformers, solenoid valves and other loads, and have high impulse loads when starting.
The time-current characteristic curve of each trip is divided into two lines, the left face of the left curve is divided into the inactive area of tripping, the right part of the right curve is the active area, and the middle area enclosed by the two curves is the unknown active area. The straight part of the curve indicates the instantaneous trip scale of the tripper. Taking Type B as an example, it can be seen that the instantaneous trip scale is 3 - 5 inches, which is consistent with the above.
For the respective scales of thermal and electromagnetic tripping in the time-current curve, the C-type tripper is used as an example. Anatomy of the thermal trip process: the circuit breaker is in a cold state, a current of 1.13In is applied, the circuit breaker does not trip, then the current is increased to 1.45In, and the trip is tripped within 2h (for ≤63A, it is tripped within 1h). This process is a curve with a 1 sign. This process is also an action process for thermal overload maintenance.
Analysis of electromagnetic tripping process: the circuit breaker is in the cold state as the initial condition, apply 5 inches of current, the circuit breaker will not trip in 0.1s of operation time, and the cold state of Delixi circuit breaker is the initial condition, apply 10 inches of current, the circuit breaker will trip within 0.1s of action time. In Figure 3, the process is a curve with sign 2. This process is also the action process of short-circuit maintenance.
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