scope:

This specification covers the general requirements for illuminated and nonilluminated, thumbwheel (see 6.3.1), inline, and pushbutton, printed circuit rotary switches having unsealed and sealed modules and the associated hardware. These switches are designed for low power alternating current (ac) and direct current (dc) switching applications for use in electronic and communication equipment. Procurement of switches and mounting hardware will require additional data, giving detailed electrical and mechanical requirements, tolerances, and applicable additions and exceptions to the general requirements and tests specified herein (see 6.1).

The military part number shall consist of the letter "M", the basic number of the specification sheet, and an assigned dash number (see 3.1), as shown in the following:

The type designation does not fully describe an individual printed circuit rotary switch. The type designation shall be of the following form and as specified (see 3.1 and 6.1).

The style is identified by the four-letter symbol "SRPC" followed by a two-digit number. The letters identify low-current capacity printed circuit switches. The number identifies the design, indicating the basic physical, mechanical, and electrical characteristics of the switch.

The construction of the switch is identified by a single letter as specified in the applicable specification sheet (see 3.1) in accordance with table I. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of in improving this document should be addressed to: Commander, Naval Electronic Systems Command, ATTN: ELEX 5043, Department of the Navy, Washington, DC 20360 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The angle of throw is identified by a two-digit number as specified on the applicable specification sheet (see 3.1). For angles of throw that are fractions of a degree, the closest, lower, whole number shall be used.

The temperature-life characteristic is identified by a single letter as specified on the applicable specification sheet (see 3.1), indicating the temperature range and electrical rotational life of the switch in accordance with table II. TABLE II. Temperature-life characteristic.

Symbol Life (rotational) Temperature range ------------------------------------------------------- cycles (°C) A 25,000 −65 and + 125 B 50,000 −65 and + 85 C 100,000 −65 and + 85 D 50,000 −65 and + 125

The vibration grade is identified by a single digit as specified on the applicable specification sheet (see 3.1), in accordance with table III. TABLE III. Vibration grade.

Symbol Frequency range -------------------------- (Hz) 1 10 to 55 2 10 to 500 3 10 to 2,000

The shock type is identified by a single, letter as specified on the applicable specification (see 3.1), in accordance with table IV. TABLE IV. Shock type.

Symbol Type of shock ------------------------------------------- H High impact M Medium impact (specified pulse), 100G, sawtooth

The altitude rating of the switch is identified by a single letter, as specified on the applicable specification sheet (see 3.1), in accordance with table V. TABLE V. Altitude.

Symbol Altitude Pressure ----------------------------------------- (feet) (inches of Hg.) O Up to 10,000 - - - B 50,000 3.44 C 70,000 1.31 D 100,000 0.315