| 摘要 |
This utility model discloses a switch-over circuit capable of switching over a supply from a 24 Vdc internal battery to a supply from a 24 Vdc external Battery, and vice versa, for supplying a device requiring a 24 Vdc input, being provided with a relay having its coil connected to the external battery. Whenever the external battery is connected to the circuit, the relay, having its normally close contact connected to the internal battery and the normally open contact connected to the external battery, will be energized and consequently effecting the connection of the external battery to the circuit as the normally open contact will close and likewise effecting the disconnection of the internal battery to the circuit as the. normally closed contact will open and thereby preventing the internal battery to become a load. |
