The rating of a c.b.:
In general, the rating of a circuit breaker is the limit of the range of operating characteristics under well defined conditions, this can include, where applicable: rated maximum voltage, rated voltage range factor K, rated frequency, rated continuous current, rated dielectric strength (dry and wet, where applicable, low frequency withstand voltage, dry impulse withstand voltage, dry chopped wave impulse withstand voltage & dry/wet switching impulse withstand voltage, rated standard duty cycle, rated interrupting time, rated permissible tripping delay, rated re-closing time, rated SCC, rated transient recovery voltage, load current switching vs. life of device, rated capacitance current switching, rated line closing switching surge factor, rated out of phase switching current, rated shunt reactor current switching, rated excitation current switching, rated control voltage, rated fluid operating pressure (if hydraulic/pneumatic control). The rated maximum voltage for the different breaker voltage classes in KV: 4.76, 8.25, 15, 25.8, 38 with rated continuous current at 60HZ in A rms: from 600 to 3000 with rated SCC (at rated maximum KV) in KA rms (nominal voltage): 9.1-30 (4.16KV), 35(7.2KV), 19.3-38(13.8KV), 25(24.6KV), 20(34.5KV). The rated insulation levels, which withstand low frequency and impulse in KV rms and crest, respectively, are: 19 & 60, 26 & 75, 36 & 95 and 70 & 150. The K factor can vary from 1 to 2. The short time ratings (3 seconds) in KA rms are: 44, 25, 37.5 and 31.5.
In general, the rating of a circuit breaker is the limit of the range of operating characteristics under well defined conditions, this can include, where applicable: rated maximum voltage, rated voltage range factor K, rated frequency, rated continuous current, rated dielectric strength (dry and wet, where applicable, low frequency withstand voltage, dry impulse withstand voltage, dry chopped wave impulse withstand voltage & dry/wet switching impulse withstand voltage, rated standard duty cycle, rated interrupting time, rated permissible tripping delay, rated re-closing time, rated SCC, rated transient recovery voltage, load current switching vs. life of device, rated capacitance current switching, rated line closing switching surge factor, rated out of phase switching current, rated shunt reactor current switching, rated excitation current switching, rated control voltage, rated fluid operating pressure (if hydraulic/pneumatic control). The rated maximum voltage for the different breaker voltage classes in KV: 4.76, 8.25, 15, 25.8, 38 with rated continuous current at 60HZ in A rms: from 600 to 3000 with rated SCC (at rated maximum KV) in KA rms (nominal voltage): 9.1-30 (4.16KV), 35(7.2KV), 19.3-38(13.8KV), 25(24.6KV), 20(34.5KV). The rated insulation levels, which withstand low frequency and impulse in KV rms and crest, respectively, are: 19 & 60, 26 & 75, 36 & 95 and 70 & 150. The K factor can vary from 1 to 2. The short time ratings (3 seconds) in KA rms are: 44, 25, 37.5 and 31.5.
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