If the tile above a voltage triggered switch is unpowered, an electric connection will be made between the tiles to its left and right. The voltage triggered inverted switch does not connect the left and right tiles to the tile above.
The normal Voltage Triggered Switch behaves oppositely, conducting when powered and not conducting when unpowered.
The image to the right shows the default state. When powered the visible "connection" part will be moved down. This causes the connection to move down and no longer join the two sides.