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2. Synchronization (alternating current) - Wikipedia

   en.wikipedia.org/wiki/Synchronization...

   A synchronizing relay is useful to remove human reaction time from the process, or when a human is not available such as at a remote controlled generating plant. Synchroscopes or lamps are sometimes installed as a supplement to automatic relays, for possible manual use or for monitoring the generating unit.

3. DIN 72552 - Wikipedia

   en.wikipedia.org/wiki/DIN_72552

   from 2nd battery and 12/24 V relay: 31 return to battery- or direct to ground 31a return to battery- 12/24 V relay 31b return to battery- or ground through switch 85d 31c return to battery- 12/24 V relay 31, 31a Electric motors; 32 return 31 33 main terminal (swap of 32 and 33 is possible) 30 33a limit 33b field 54e 33f 2. slow rpm: 33g 3. slow ...

4. Automotive fuse - Wikipedia

   en.wikipedia.org/wiki/Automotive_fuse

   The Lucas 1/4" diameter glass tube fuse have a different length as compared to the standard US item. The Lucas 1/4" diameter glass tube fuse is 1 + 5 ⁄ 32 in (29 mm) long, while the US standard 1/4" glass tube fuse is 1 + 1 ⁄ 4 in (32 mm)] long. However, many Lucas fuse holders permit the longer US version to be installed easily.

5. Power-system automation - Wikipedia

   en.wikipedia.org/wiki/Power-system_automation

   A protective relay is an IED designed to sense power-system disturbances and automatically perform control actions on the I&C system and the power system to protect personnel and equipment. The relay has local termination so that the copper conductors for each contact do not have to be routed to a central termination panel associated with RTU.

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7. Synchroscope - Wikipedia

   en.wikipedia.org/wiki/Synchroscope

   In addition to synchronizing generators to power systems, similar frequency-difference indicating instruments are used on multiengine ships and aircraft to allow the operators to exactly synchronize the speed of engines. This helps reduce the noise and vibration due to slight differences, for example, in the speeds of two propellers on an aircraft.