NOTE: This draft, dated 16 May, 2014 prepared by DLA-CC has not been
approved and is subject to modification.
DO NOT USE PRIOR TO APPROVAL.
(Project 5945-2014-014)
INCH-POUND
MIL-PRF-28776F
20 August 2014
SUPERSEDING
MIL-PRF-28776E
10 September 2012
PERFORMANCE SPECIFICATION
RELAYS, HYBRID, ESTABLISHED RELIABILITY,
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 establishes the general requirements for relays that use a combination of solid state
circuit input elements functioning with an electro-mechanical relay that performs the switching functions associated
with control system applications (see 6.1). These relays are designed to operate in low and medium power switching
circuits with contact ratings up to 1 ampere alternating current (ac) or direct current (dc). The failure rate level is
established at a confidence level of 90 percent for qualification and 60 percent for maintenance of qualification based
on 100,000 cycles at +125°C under rated load conditions specified herein. Excludes time delay relays. CAUTION:
The use of any coil voltage less than the rated coil voltage will compromise the operation of the relay. CAUTION:
Pick-up, hold, and dropout voltages are for test purposes only and are not to be used as design criteria. For
additional application and caution information, see 6.1.
1.2 Part or Identifying Number (PIN). The PIN consists of the letter "M", the basic number of the specification sheet,
an assigned dash number (see 3.1), and a suffix letter designating failure rate level (see table I) as shown in the
following example:
M
28776
-001
L
|
|
|
|__
M prefix
Specification
Dash
Failure
designator
sheet numb
number
rate level
1.3 Failure rate (FR) level designation. The failure rate level designation is shown in table I (see 4.6).
TABLE I. Failure rate level designation.
Failure rate level designation
Failure rate level
(percent per 10,000 cycles)
L
3.0
M
1.0
P
0.1
R
0.01
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 mailto:Relay@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 5945
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