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Page 162

| Figure 9-5 Centrifugal-motor-operated mechanism. |

| oped closes the breaker through a system of linkages (and compresses a spring, if the mechanism is so equipped). The breaker and spring are latched in this position, and the motor is de-energized by means of the auxiliary switch. Opening is accomplished in the same manner described for solenoid operation. The motor may be operated either on ac or dc. This type of mechanism is often used in automatic reclosing equipment. |

| Pneumatically Operated Mechanisms |

| The pneumatic or compressed air method of operation is used for heavy duty or very large breakers (Fig. 9-6). It has an unusually fast action. Since compressed air is used to close the breaker contacts, an air compressor and |

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