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|  MIL-R-5757H
4.6.20.4 Low level. Relays shall be tested in accordance with method 311 of MIL-STD-202. The
following details apply:
a. Number of misses which will be considered a failure: One.
b. Maximum contact resistance allowed: See 3.1.
c. Number of cycles of operation and cycling rate: 100,000 cycles, unless otherwise specified (see
3.1) at the rate of 60 cycles to 300 cycles per minute (c/m).
d. Contact load: 10 A to 50 A at 10 mV to 50 mV open circuit (maximum dc or peak ac).
e. Dry reed contact load: 10 mA maximum at 30 mV open circuit (maximum dc or peak ac).
4.6.21 Intermediate current (see 3.23). 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 energizing voltage: Rated voltage (or current) (see 3.1).
c. Cycling rate: Ten cycles 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: +125C minimum.
4.6.22 Mixed loads (applicable to high level relays only; see 3.24). For qualification inspection, relays
shall be tested in accordance with 4.6.20.1 or 4.6.20.2, as specified (see 3.1). Relays shall be mounted
as specified in 4.2.5. The ambient temperature of the test chamber shall be the maximum temperature
rating of the relay. Unless otherwise specified (see 3.1), coils shall be energized with rated voltage (or
current) at the rate specified herein; however, intermittent duty and pulse-operated relays shall be
operated as specified (see 3.1). The same type load shall be used for each contact of the same pole.
Contacts shall be monitored for dynamic contact resistance at each operation; however, unless otherwise
specified (see 3.1), contacts carrying rated resistive load need not be monitored. Unless otherwise
specified (see 3.1), contacts shall be loaded as follows; however, if any load specified herein exceeds
the contact rating (see 3.1), the load shall be as specified (see 3.1). For group B inspection, relays shall
be tested as specified herein, except that the number of operations shall be 10,000. The following
details and exceptions apply:
a. Maximum static contact resistance: As specified in 3.10.1.
b. Coil energizing voltage: Rated voltage (or current) (see 3.1).
c. Cycling rate: Ten cycles 2 cycles per minute with minimum of 75 percent coil "ON" time.
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