For Parts Inquiries call (727) 344-9615
A Service Disabled Veteran Owned Small Business
© Copyright 2015 Integrated Publishing, Inc.

MIL-PRF-28776 Relays, Hybrid, Established Reliability, General Specification ForThis 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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13


img
. . . . . . .
MIL-PRF-28776F
FIGURE 10. DC inductive load (inductive current rise time curve).
4.8.19 Intermediate current (see 3.24). Intermediate current shall not be considered a low level or high level
contact load rating (see 6.1.1). Relays shall be tested as specified in method 312 of MIL-STD-202. The following
details and exceptions shall apply:
a.
Maximum contact resistance: As specified in 3.24.
b.
Coil circuit energizing voltage: Rated coil circuit supply voltage (see 3.1).
c.
Cycling rate: 10 ±2 cycles per minute with minimum of 75 percent coil "on" time.
d.
Contact current/voltage: 100 mA at 28 V dc.
e.
Monitoring: At least 40 percent of the closed time of each contact during each operation shall be monitored
for contact resistance.
f.
Number of cycles: 50,000 cycles.
g.
Ambient temperature: +125°C minimum.
4.8.20 Mechanical life (see 3.25). Relays shall be cycled one million cycles at room ambient temperature. The
cycling rate shall be as specified in 4.8.18.4. Each contact load shall be 10 to 50 µA at 10 to 50 mV (dc or peak ac).
The coil circuit shall be energized at rated voltage during 50 ±10 percent of each cycle. Mechanical life cycles shall
not be used for failure rate determination or maintenance.
39



For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business

© Copyright 2015 Integrated Publishing, Inc. Site Design & Marketing by Strategico.