Molded Case Circuit Breaker Shell Rating

Update date:2018-05-18 Source:MAXGE

Molded Case Circuit Breaker Shell Rating

Molded case circuit breaker shell frame rating Circuit breaker case frame rated current rating refers to the rated current of the maximum release that can be installed in the frame with the same basic size and the plastic case. Circuit breaker rated current refers to the current that the trip unit in the circuit breaker can pass for a long time. It is also called the rated current of the circuit breaker trip unit.

MCCB

 There are several kinds of shell frame rated current in the same series, and there are multiple rated currents in the same shell frame rated current. For example, in the SGM3 series, there are 100, 225, 400, 630, 800, 1250 and other shell-class rated current ratings, while the 100-shell rated current rating is 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A rated Current; 225A shell rated current in 100A, 125A, 160A, 180A, 200A, 225A rated current.

Molded Case Circuit Breaker

Both SGM3-100 and SGM3-225 have 100A rated current in two kinds of shell frame grades, but the circuit breaker volume shape and breaking capacity are not the same, so when the selection is made, the model should be filled in, ie, the specific circuit breaker within the rated level current of the shell frame. Rated current. The rated current rating is selected according to the (1.25) priority factor: on the one hand, it meets and meets the requirements for the maximum line and rated current of the electrical components; on the other hand, it is for standardization in order to obtain the best use of wire and the efficiency of the process. Therefore, the levels it provides are: 3(6), 8, 10, 12.5, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400A and so on. Because of this provision, when the line calculation load is 90A, only the 100A specification can be selected, thus affecting its protection performance to some extent.

Molded Case Circuit Breaker

The release current setting means that the release adjusts to the operating current value. It refers to the multiple of the rated current In, which is the action current value. For example: overcurrent is set to 1.2, 1.3, 5, and 10 times the current, and Ir=1.2In, 1.3In, 5In, 10In, etc. are written. At present, some electronic trip units have an adjustable long-delay rated current. The adjusted current is still the rated current and is the maximum current that can be passed for a long time. The rated operating current is the actual operating current of the contactor at a certain working voltage when the circuit breaker is installed with an auxiliary contact (accessory), and the current is 3A or 6A for controlling and protecting the circuit.

Copyright© 2017 www.maxge.com All Rights Reserved.

Copyright© 2017
www.maxge.com All Rights Reserved.

悬浮

CONTACT US

NAME

Email

Phone

MESSAGE

We won't share your info with third parties.