scope:

This specification covers snap-action and detent and spring action rotary switches for use in alternating and direct current applications, with ratings as specified (see 3.1).

The class designation shall be composed of a number indicating the current rating followed by the letters SR or SRN, the component designator for rotary switches covered by this specification (see table I). TABLE I. Class designation.

Maximum current Positioning Class in amperes Maximum Vac Maximum Vdc mechanism --------------------------------------------------------------------------------- 1SR 10 125 120 Snap 1SRN 10 125 - Detent/spring return 3SR 30 500 250 Snap 6SR 60 500 250 Snap 20SR 200 500 250 Snap

Detent and spring return mechanism, designated by the letter N, shall be driven directly from the handle shafts with an increment of handle and blade rotation of 90 degrees. Omission of the letter N from the class designation shall mean that a snap mechanism which shall activate from a handle shaft rotation of not greater than 135 degrees is required. Actuation of the snap mechanism shall cause the switch blades to rotate 90 degrees to 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 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. the directed position at a speed independent of the speed at which the handle shaft is turned. After the blades have moved into the directed position and the handle has been released, the handle shall reverse its rotation approximately 45 degrees to correspond with the 90-degree switch throw increment.

Switches covered by this specification shall be identified by a part or identifying number (PIN), (see 3.1 and 6.8). Type designations, where assigned in addition to PINs, are for reference to identifications established in previous issues of this specification (see 3.3 and 6.7).

intended Use: