Universal in application, the test sets will test virtually all low-voltage, molded-case and metal-clad, directacting ac circuit breakers produced by General Electric, Westinghouse, Federal Pacific, Square D, Gould, ABB, ITE, Siemens and other manufacturers. Model DDA-3000 is rated for testing breakers up to 3000 amperes. Model DDA-6000 is rated for testing breakers up to 6000 amperes. Rugged and reliable, Megger circuit breaker test sets will provide years of trouble-free operation. The test sets also may be used for other high-current applications, such as verifying the ratio of current transformers and performing heat runs or primary injection testing of high-voltage breakers and their associated protective relays. All Model DDA-3000 and DDA-6000 test sets have identical features, instrumentation and operational characteristics. The only changes in the specifications among the units are their size, weight and maximum output-current capacity.