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Question
What is Y/Za/Zb?
Answer
| Illustration | Mark | Contact type | Applicable models | Remarks |
 |  | Y | A165E A22E | Two contacts switched together |
 |  | Za | D4B-N (snap action) | Four contacts switched together: One movable contact blade opens and closes. This type cannot use power with different voltages or polarities. |
 |  | Zb | D4B-N (slow action) D4BS D4BL D4N D4NS D4N-R D4NH D4NL D4GS-N D4F D4JL D4GL | Four contacts switched together: The two movable contact blades are insulated from each other. This type can use power with different voltages or polarities.  Terminals 11 and 12 in the illustration are the contacts forcibly opened. |
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