MIL-R-5757J
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. 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. Two pole relays shall be tested as follows:
Sample 1 (pole 1): 0.1 ampere resistive at 28 ±1 V dc. (pole 2): rated resistive load at 28 ±1 V dc.
Sample 2 (pole 1): 0.3 ampere inductive load (220 mH) at 28 ±1 V dc. (pole 2): rated resistive load at 28 ±1 V dc.
Sample 3 (pole 1): 0.5 ampere resistive at 28 ±1 V dc. (pole 2): rated resistive load at 28 ±1 V dc.
Sample 4 (pole 1): 0.1 ampere resistive at 28 ±1 V dc. (pole 2): rated resistive load at 28 ±1 V dc.
Three pole relays shall be tested as follows:
Sample 1 (pole 1): 0.1 ampere resistive at 28 ±1 V dc.
(pole 2): 0.3 ampere inductive load (220 mH) at 28 ±1 V dc. (pole 3): rated resistive load at 28 ±1 V dc.
Sample 2 (pole 1): 0.1 ampere resistive at 28 ±1 V dc. (pole 2): 0.5 ampere resistive at 28 ±1 V dc. (pole 3): rated resistive load at 28 ±1 V dc.
Sample 3 (pole 1): 0.3 ampere inductive load (220 mH) at 28 ±1 V dc. (pole 2): 0.5 ampere resistive at 28 ±1 V dc.
(pole 3): rated resistive load at 28 ±1 V dc.
Sample 4 (pole 1): 0.1 ampere resistive at 28 ±1 V dc.
(pole 2): 0.3 ampere inductive load (220 mH) at 28 ±1 V dc. (pole 3): rated resistive load at 28 ±1 V dc.
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