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2. ISO standards for trailer connectors - Wikipedia

   en.wikipedia.org/wiki/ISO_standards_for_trailer...

   12 Volt 7-pin trailer connector ISO 7638-2 for ABS and EBS (Towing vehicle side) Physical design according to standard ISO 7638-2. [4] [6] [7] This connector is intended to be used for 12V ABS and EBS on heavy duty trailers. Identified by key tab on outer ring between pin 3 and 4. #

3. DIN 72552 - Wikipedia

   en.wikipedia.org/wiki/DIN_72552

   battery+ through ignition switch 16, 54/15 30 from battery+ direct 30/51 30a 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

4. Vandal-resistant switch - Wikipedia

   en.wikipedia.org/wiki/Vandal-resistant_switch

   The switches are at the rear of the unit; only LED lights are on the front of the panel. When the unit is rack-mounted into a wall or rack unit, this means that only official personnel (who are able to access the back of the panel) can change the settings or use the unit. Another variant on this design is to cover the switches with a locked panel.

5. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   A toggle light switch Internal components of a toggle switch. The toggle mechanism provides "snap-action" through the use of an "over-center" geometry. The design was patented in 1916 by William J. Newton and Morris Goldberg. [2] The switch actuator does not control the contacts directly, but through an intermediate arrangement of springs and ...

6. TO-92 - Wikipedia

   en.wikipedia.org/wiki/TO-92

   The main disadvantage of this style of case is the lack of heat sinking.. Transistors and ICs of these types cannot handle as much power as higher-power equivalents, such as the TO-220, and can burn out quickly if they dissipate excessive power.