Insulated Case Circuit Breaker Definition

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit its basic function is to interrupt current flow after a fault is detected.

Insulated case circuit breaker definition.

There is no industry definition for iccbs in the ansi nema or ul standards. Mccb labeled circuit diagram. An insulated case circuit breaker has all the characteristics of a molded case circuit breaker with the addition of a two step stored energy mechanism. Molded case circuit breaker definition and function.

Molded case circuit breakers molded case switches and circuit breaker enclosures ul standard. Iccbs were developed by mccb manufacturers to. Air circuit breakers are used for circuits from 800 amps to 10 000 amps. An insulated case circuit breaker iccb is a circuit breaker that is similar in construction to an mccb but typically uses an electronic or digital ocpd and has much higher interrupting ratings.

Standard 489 edition 13 edition date. Mccb and iccb are almost the same and both are manufactured in accordance to nema ab1 ab3 to suit industrial and commercial purposes. Mccb molded case circuit breaker insulated case circuit breaker are also current limiting devices but with high making breaking capacity and current ratings compared with mcb. Unlike a fuse which operates once and then must be replaced a circuit breaker can be reset either manually or automatically to resume.

A molded case circuit breaker abbreviated mccb is a type of electrical protection device that can be used for a wide range of voltages and. An mccb provides protection by combining a temperature sensitive device with a current sensitive electromagnetic device. The traditional molded case circuit breaker uses electromechanical thermal magnetic trip units that may be fixed or interchangeable. The insulated case circuit breaker can be purchased today with any of a growing list of accessories several of which are briefly reviewed in the following paragraphs.

In addition insulated case circuit breakers have a push to open button and rotary ratchet operated low torque handles with independent spring charged mechanism providing quick connect. Both these devices act mechanically on the trip mechanism. Scope summary of topics. An insulated case circuit breaker is a molded case circuit breaker that uses a glass reinforced insulating material such as fiberglass for dielectric strength.

Mccb frames and cases. October 24 2016 dod approved.