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Different types of circuit breakers are shown in Figs. 1, 2, 3, and 4. Note that the circuit breaker housing configuration and construction depend on the current interrupting medium. As mentioned previously, Fig. , 600 V) molded-case circuit breaker (1). The high-voltage (5 kV to 38 kV) outdoor breakers and oil reclosers have three interrupters within one tank, as shown in Fig. 2, whereas very high voltage breakers may have three separate tanks, each containing an interrupter. For either style of breaker, the actuating mechanism is external to the breaker.

Magnetic air and vacuum metal-clad circuit breakers are available in the United States. Other countries have these types as well as SF6 breakers. Air magnetic or vacuum breakers consist of a frame that is drawn from the switchgear unit by a set of rails. LV Power Air Breaker The construction of the magnetic air breaker for indoor metalclad switchgear is similar to that of the metal-clad vacuum breakers except for the current-interrupting elements. The construction of the breaker is shown in Fig.

CIRCUIT BREAKERS 371 Table 2. Molded-Case Circuit Breaker Rating Chart Max. Current, A Standard ICU ICS ICU ICS ICU ICS ICU ICS a NEMA/UL NEMA/UL NEMA/UL NEMA/UL IEC 157a IEC 157a IEC 157a IEC 157a IEC 947 IEC 947 IEC 947 IEC 947 IEC 947 IEC 947 IEC 947 IEC 947 Voltage, V 240, 480, 600, 260, 240, 380, 415, 250, 240, 240, 380, 380, 415, 415, 250, 250, ac ac ac dc ac ac ac dc ac ac ac ac ac ac dc dc 150 kA 250 kA 400 kA 600 kA 65–200 25–100 25–50 65–200 25–100 18–35 10–22 65–200 35–100 35–100 10–22 65–200 25–100 18–35 10–22 65–200 35–100 35–100 10–22 65–200 25–100 25–50 10–22 65–200 40–100 40–100 10–22 65–200 17–50 40–100 10–25 40–100 10–25 10–20 3–5 800/1200 kA 1600/2000 kA 65–200 25–100 25–50 65, 200 65, 100 25, 50 65–200 17–50 50–100 15–25 50–100 15–25 125, 32, 65, 17, 65, 17, 200 50 100 25 100 25 Obsolute, superseded by IEC 947-1.

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