scope:

This specification covers low voltage, electric power, air circuit breakers with open frame and removable construction, and their attachments, for shipboard use.

Circuit breakers shall be of the following types, as specified (see table I, 6.2.1 and 6.6).

ACB-900RC ACB-2000HRC ACB-3200HR ACB-901R ACB-2000RC ACB-4000HR ACB-902R ACB-2002HRC ACB-4001R ACB-1600HRC ACB-2601R ACB-6400HR

Designation "C" is optional where shown.

Circuit breaker type designations are as follows:

ACB - Denotes an open frame air circuit breaker. XXXX - Three or four digit number which denotes the rated continuous current of the specific circuit breaker type. When the last number of the circuit breaker type is even (0, 2, 4, 6, 8) the application is for alternating current (a.c.) and when the last number is odd (1, 3, 5, 7, 9) the application is for direct current (d.c.). The final number is used to show a change in physical or electrical design of the same current rating.

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 55Z3, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

C - This suffix when used, indicates that the circuit breaker is designed for duty as a motor starter and has 3 overcurrent (OC) coils. H - This suffix indicates that the circuit breaker has a rated a.c. short-circuit current greater than 50,000 amperes (A). R - This suffix indicates that the circuit breaker is a drawout- mounted device, consisting of a removable component and a stationary component. The stationary component is mounted in an enclosure and the removable component can be withdrawn from the enclosure and stationary component for maintenance purposes.

intended Use: