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The parts listed are based on the metal bodied ZB4B 22mm range but could also apply to the plastic ZB5A equivalent parts.
The 3 position switch* has 2 plungers. In the left position the left plunger operates a contact block in the left and centre. In the right position the right plunger operates a contact block in the right and centre.
KEY; Black square = contact closed. White square = contact open.
Thus to obtain 3 separate circuits, one of which will active (logic state 1) in each of the 3 positions, then 3 contact blocks will be required as follows;
Left position; ZBE101 (N/O) Contact only closes (makes circuit) in left position.
Centre position; ZBE102 (N/C) Contact only closed (makes circuit) in centre position, when switched to left or right the contact is opened.
Right position; ZBE101 (N/O) Contact only closes (makes circuit) in right position.
The above can be specified as a ZB4BD3 (3 position head) + ZB4BZ103 (body with 2 N/O contacts) + ZBE102 (N/C contact block)
*Important note; This information is based on the newer (as featured in current catalogue) design of 3 position selector switches (e.g ZB4BD3) that have a revised design of plunger.