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About Circuit Breakers
Circuit breakers are switching devices capable of making, carrying and breaking currents under normal circuit conditions and making, carrying for a specified time, and breaking current under specified abnormal conditions such as a short circuit. Low voltage circuit breakers have voltage ratings from 250 to 600 V AC and 250 to 700 V DC. The molded case circuit breaker is one of the two basic low voltage classes of circuit breakers. The other class is the low voltage power circuit breaker. Medium voltage circuit breakers are rated up to 72.5 kV. ANSI or IEC is normally the governing standard for medium voltage circuit power breakers. ANSI is associated with U.S. standards, and IEC is associated with international standards. For standard definitions, refer to ANSI 37.100 Definitions for Power Switchgear.
Important ratings specifications to consider for circuit breakers include rated AC voltage, rated DC voltage, continuous current rating, and rated breaking capacity (Icn). The rated AC and DC voltages are the maximum voltage for ANSI rated breakers or the Voltage Class for IEC rated breakers. The continuous current (at the rated voltage) on ANSI breakers or the normal current on IEC breakers should always be in excess of the utilization equipment rating to provide for a short-time overload capability. It is also referred to as the Frame Rating or the Frame Size. The rated breaking capacity is the rated short circuit capacity or interrupting capacity. The short circuit current is rated at the breaker's maximum voltage (ANSI) or voltage class (IEC). The number of poles and number of protected poles (if different) are also important parameters to consider.
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Engineering Web: Circuit Breakers
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HowStuffWorks "How Circuit Breakers Work" How Circuit Breakers Work by Tom Harris "How Circuit Breakers Work." 09 May 2002. |
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ADVAC? - Advanced Design Vacuum Circuit Breakers Technical... 4 Product Description ADVAC Circuit Breakers ................................... 6 Cell Interface and Racking ........................... 1 0 Modular |
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166_08 ABB Antrieb 4S_engl RZ.qxd:Brochure.qxd Mechanism for High Voltage Circuit Breakers Integrated operating mechanism portfolio for high voltage circuit breakers from 52 to 1000 kV 166_08 ABB |
Part Numbers for Circuit Breakers
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| LOT3 CIRCUIT BREAKERS | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
| CIRCUIT BREAKER | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
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