The frame rating current of a molded case circuit breakeris the maximum rating of the striker that can be installed on a frame and molded case enclosure of the same basic size. The circuit breaker rated current is the current through which the circuit breaker release can pass for a long period of time, also known as the circuit breaker release rated current.

For example, there are multiple rack level rated currents in the same series, and multiple rated currents in the same rack level rated current. For example, the DZ20 series has 100, 225, 400, 630, 800, 1250 and other frame level rated currents. 100 frame level rated currents have 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100 225A frame level rated currents have 100A, 125A, 160A, 180A, 200A, 225 A rated current. For example, a production company on the market in the production of products DZ20 series molded case circuit breakers, product model DZ20-100 and DZ20-225 two case frame rating has a rated current of 100 A, the volume, shape and breaking capacity of the circuit breaker is different, the model that the specific situation if you do not know much about this information, please call customer service directly. Rated current rating according to (1.25 ) priority factor selection. First, to meet and satisfy the needs of the maximum line and electrical components rated current. Second, it is standardized to achieve the best use and processing of the wire. Therefore, it specifies the level of 3 (6), 8, 10, 12.5, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400 According to this provision, the line calculated load of 90A, only 100A specifications can be selected, so it will affect the protection performance to some extent.

The decoupler current rectification value is the decoupler adjusted to the action current value. This is a multiple of the rated current In, which is the action current value. Overcurrent is adjusted to 1.2, 1.3, 5, 10 times the current when writing Ir = 1.2In, 1.3In, 5In, 10In, etc. At present, some electronic decoupler can control overload, long time delay, rated current, the regulated current is actually rated current, is the maximum current that can be passed for a long time.

Rated action current is the actual action current of the contact under a certain action voltage when the auxiliary contact (accessory) is installed, the current is 3A or 6A, which is used for control and protection of the circuit.

About the flying arc distance of the plastic case circuit breaker, here is only a brief introduction, for reference only.

Case circuit breaker in cutting off the larger short-circuit current, its movable, electrostatic contact separation will produce an arc, part of the arc or ionized gas from the power side of the circuit breaker arc spray mouth. The arc itself is a huge current, easily caused by bare conductive body and bare charged body and "ground" (the equipment's metal shell grounding) phase short circuit and grounding accidents. To ensure safety, the user should maintain a certain distance according to the manufacturer's catalog or the data provided in the instruction manual. Distribution cabinet, cabinet height distance is not enough, you can choose a small flying arc distance or zero flying arc products, with plastic case circuit breaker by professional and technical personnel to detect the flying fox distance, increase the arc extinguishing mechanism to ensure the safety of electricity.

Although many people usually ignore the structural grade and flying arc distance characteristics of the shell circuit breaker, but in fact they are also an important part of the shell circuit breaker, plays an important role and deserves attention.