Specifications and models of MCCB(Molded Case Circuit Breakers)

Specifications and models of MCCB(Molded Case Circuit Breakers)
Specifications and models of MCCB(Molded Case Circuit Breakers)

Specifications and models of MCCB(Molded Case Circuit Breakers)

MCCB(Molded Case Circuit Breakers) is a kind of protection device that provides special protection function for overload and short circuit in low voltage distribution system and motor protection circuit. Because of its reliability and stability, it is widely used in industry. PiPiLi.com will help you to better understand MCCB(Molded Case Circuit Breakers)s by introducing the model specifications and tripping characteristics of MCCB(Molded Case Circuit Breakers).

  1. Specification and model ofMCCB(Molded Case Circuit Breakers)

MCCB(Molded Case Circuit Breakers) have 10 type M1 DZ15\DZ20 type and DZ15LE DZ20LE DZ18. MCCB(Molded Case Circuit Breakers) can automatically cut off the current when the current exceeds the trip setting. Molded shell refers to a plastic insulator used as the housing of the device to isolate the conductors and the grounded metal portion. Molded case circuit breakers usually contain a thermal-magnetic trip unit, while large-sized molded case circuit breakers are equipped with a solid-state trip sensor. The trip unit is divided into: thermal magnetic trip and electronic release. Commonly used rated currents have the following 15 25 30 40 50 60 75 80 100 125 160 200 225 250 315 350 400 500 630 A.

MCCB(Molded Case Circuit Breakers) are used to make, break, and carry rated operating currents in the circuit and to perform reliable circuit breaker protection under overload, short circuit, and undervoltage conditions. The dynamic and static contacts and contact bars of the circuit breaker are designed to be parallel. The electric repulsive force generated by the short circuit is used to break the movable and static contacts, and the breaking capacity is high, and the current limiting characteristics are strong.

  1. the release characteristics of MCCB(Molded Case Circuit Breakers)

MCCB(Molded Case Circuit Breakers) tripping characteristics are divided into A, B, C, D, K and other types, their respective meanings are as follows:

Type A tripping characteristics: The tripping current is (2 ~ 3) In, suitable for protecting semiconductor electronic circuits, measuring lines with low-power transformers, or systems with long lines and short-circuit currents.

Type B tripping characteristics: The tripping current is (3 ~ 5) In, suitable for household distribution system, household appliances protection and personal safety protection.

Type C tripping characteristics: The tripping current is (5 ~ 10) In, which is suitable for protecting power distribution lines and lighting circuits and motor circuits with high on-current.

D-type tripping characteristics: The trip current is (10 ~ 20) In, suitable for the protection of equipment with high inrush current, such as transformers, solenoid valves.

K-type tripping characteristics: 1.2 times the thermal tripping action current and 8-14 times the magnetic tripping action range, suitable for protection of motor circuit equipment, high impact current capability.

  1. Selection of MCCB(Molded Case Circuit Breakers)and Product Price Example

In order to meet the needs of different users, many MCCB(Molded Case Circuit Breakers) manufacturers in China now classify the short-circuit breaking capacity of the rated current of the same frame into different levels. For example, Changshu Switching Factory CM1-100 is divided into C basic type (25-35kA), L standard. Type (35 ~ 50kA), M higher breaking type (50 ~ 75kA), H high breaking type (85 ~ 100kA). When the user selects, it must meet the limit short-circuit breaking capacity of the MCCB(Molded Case Circuit Breakers), and the expected short-circuit current of the line can meet the requirement, and it is not necessary to artificially add the coefficient of insurance so as to avoid waste.

Schneider MCCB(Molded Case Circuit Breakers): NSX100S TM63D 3P3D (3P) Fixed front wiring, market reference price: 984.36 yuan / only.

Eaton Electric MCCB(Molded Case Circuit Breakers): NZMN1-A40 3P, Thermal Magnetic Fixed Type, Market Reference Price: 728.95 Yuan/only.

ABB MCCB(Molded Case Circuit Breakers): A2B250 TMF250/2500 FF 3P, market reference price: 691.59 yuan / only.

Changshu switch MCCB(Molded Case Circuit Breakers) body: CM5-250L/3/3G/00 125A, market reference price: 900 yuan / only.

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