△ The rated current of the circuit breaker is shown in Table 1

△ The rated short-circuit breaking capacity and short-time withstand current of the circuit breaker are shown in Table 2. The arcing distance of the circuit breaker is zero 4 (i.e., there is no arcing outside the circuit breaker).

△ The maximum power consumption of the circuit breaker is 360W. The changes in the rated continuous current of the circuit breaker under different ambient temperatures are shown in Table 3.

Note: 2500A and above will be derated by a factor of 0.9. 4000A in 6300A will not be derated.

△ M-type intelligent overcurrent controller protection characteristics and functions:

△ Overcurrent controller protection characteristics

△ The controller setting value lr (l/ln) and error are shown in Table 4.

Note: When three-stage protection is required at the same time, the setting value cannot be crossed

△ The inverse time action characteristic of long-time overcurrent protection is I²Tι=（1.5Ir1）²tL. The action time of (1.05~2.0)Ir1 is shown in Table 5. The time error is ±15%.

Note: tL- setting time of long delay 1.5Ir1, Tι- action time of long delay.

△ Short-time delay overcurrent protection characteristics

The short-time delay overcurrent protection is a fixed-time characteristic. If the low multiple is required to be an inverse time characteristic, its characteristic is as follows: I²Ts= (4Ir1)²tS, where tS is the general delay design time and Ts is the short-time delay action time; When the overload current >4Ir1, it automatically converts to a fixed-time characteristic. Its fixed-time characteristic is shown in Table 6. The time error is ±15%.

Fixed circuit breakers are mainly composed of contact systems, intelligent controllers, manual operating mechanisms, electric operating mechanisms, and mounting plates; drawer-type circuit breakers are mainly composed of contact systems, intelligent controllers, manual operating mechanisms, electric operating mechanisms, and drawer seats. The circuit breaker is in a three-dimensional layout, with the characteristics of compact structure and small size. The contact system is enclosed in an insulating bottom plate, and each phase contact is separated by an insulating plate to form a small chamber, while the intelligent controller, manual operating mechanism, and electric operating mechanism are arranged in front of it in sequence to form independent units. If one of the units is broken, it can be completely removed and replaced with a new one.

The drawer-type circuit breaker consists of an insert circuit breaker and a drawer seat. The guide rails in the drawer seat can be pushed in and out, and the insert circuit breaker seat is placed on the guide rails to enter and exit the drawer, and the main circuit is connected by inserting the busbar on the insert circuit breaker and the bridge contact on the drawer seat. The drawer-type circuit breaker has three working positions: "connected", "test" and "disconnected". The position change is achieved by rotating the handle in or out, and the three positions are indicated by the pointer on the crossbeam of the drawer base.

When in the "connected" position, both the main circuit and the secondary circuit are connected. When in the "test" position, the main circuit is disconnected and separated by an insulating partition. Only the secondary circuit is connected, and some necessary action tests can be performed; when in the "disconnected" position, the main circuit and the secondary circuit are completely disconnected. In addition, the drawer-type circuit breaker has a mechanical interlocking device. The circuit breaker can only be closed in the connected position or the test position, and the circuit breaker cannot be closed in the middle position between the connection and the test.