Relay Circuit Explanation
Pins 5 and 6 of the left relay are connected together internally. You can connect them together externally or not. 

The internal schematic does not directly represent the internal configuration (which is 3-dimensional). For example, in the right hand relay, the normally closed contact is above the moving contact which is above the normally open (Z-axis, out of the screen). Photo from this website:



Monostable relays are always shown in the de-energized state. So the relay with no power on it, has pin 1 connected to 5&amp;6 (left ) and pin 1 connected to 4 (right). With the coil energized, pin 10 is connected to 5&amp;6 (left) and pin 1 is connected to 3 (right).