NEMA SG 4
Alternating Current High-Voltage Circuit Breakers
|Publication Date:||1 January 2009|
This standards publication encompasses:
a. All ratings for outdoor circuit breakers above 1000 volts for alternating-current service. Circuit breakers for service in metal-enclosed or metal-clad enclosures and automatic circuit reclosers are excluded.
b. Attachments for these circuit breakers, such as bushing current transformers, bushing potential devices, interlocks, undervoltage trip devices, shunt trips, overcurrent trips, and auxiliaries sold with the circuit breakers such as closing relays and structural steel supports.
c. Renewal, modernizing, and spare parts for these circuit breakers and attachments.
d. Recommended installation, operation, and maintenance procedures.