INCH-POUND
MIL-DTL-15291G
29 April 2013
SUPERSEDING
MIL-DTL-15291F
6 February 2006
DETAIL SPECIFICATION
SWITCHES, ROTARY, SNAP ACTION AND DETENT/SPRING RETURN ACTION,
GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments and Agencies of the Department of Defense.
1. SCOPE
1.1 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).
1.2 Class. The class designation should 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
Class
in amperes
Maximum V ac
Maximum V dc
Positioning mechanism
1SR
10
125
120
Snap
1SRN
10
125
N/A
Detent/spring return
3SR
30
500
250
Snap
6SR
60
500
250
Snap
20SR
200
500
250
Snap
1.2.1 Positioning mechanism. Detent and spring return mechanism, designated by the letter N, should
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 should mean that a snap mechanism which should
activate from a handle shaft rotation of not greater than 135 degrees is required. Actuation of the snap
mechanism should cause the switch blades to rotate 90 degrees to 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 should reverse its rotation approximately
45 degrees to correspond with the 90-degree switch throw increment.
1.3 Identification. Switches covered by this specification should be identified by a part or identifying
reference to identifications established in previous issues of this specification (see 3.3 and 6.7).
Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT,
Post Office Box 3990, Columbus, OH 43218-3990, or emailed to switch@dla.mil. Since contact information can
change, you may want to verify the currency of this address information using the ASSIST Online database at
AMSC N/A
FSC 5930
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