Mark VI Circuit-Switchers

Ratings

Voltage and Continuous, 4-Hour, Peak Withstand, and Fault-Closing Current Ratings — 50/60-Hz.
kV			Amperes, RMS
Nom.	Max	BIL	Cont.	4-Hour	Peak Withstand	1-Second	Fault-Closing, Duty-Cycle, Two-Time
69	72.5	350	420	630	81 900	31 500	30 000
115	123	550	420	630	81 900	31 500	30 000
138	145	650	420	630	81 900	31 500	30 000

Interrupter Current Ratings For Shunt Capacitor Bank Switching and Protection
Class	Qualifications		Maximum Amperes, Interrupting RMS Symmetrical
Bank Current Switching	Grounded capacitor banks applied on solidly grounded systems only, through 138 kV	420
Bank Current Switching	Ungrounded capacitor banks through 138 kV		420
Fault Interrupting	—		31 500

Interrupter Current Ratings For Transformer Switching and Protection
Class	Qualifications	Maximum Amperes, Interrupting RMS Symmetrical
Load Dropping	—	630
Duty-Cycle Fault Interrupting	3-Time	31 500
	5-Time	18 900
	10-Time	9 450
	30-Time	3 150
Secondary Faults	69 kV	4 200
Secondary Faults	115 kV through 138 kV	2 600
Internal faults — see both primary and secondary faults, above