Circuit breaker has other breaking capacity ratings based on operting voltage. Miniature Circuit Breaker, EJB Series, 70A, 3 Pole, 277/480V AC, 100kA at 120V AC This 3 pole 70 A breaker is rated for HACR applications.E Frame thermal magentic circuit breakers are for use in NF panelboards. Electrical connections are made using aluminum lugs.