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what is the diference between the two push buttons(XB7EH31P) and (XB7EH35P) ?

XB7EH31P is of 1NO contact while XB7EH35P is of 1 C/O contact so the difference is in the contact composition, I have attached the catalog pages for them for your reference

The terminal description is related to the contact where as per standard EN 50013 gives the numbering & naming of the contacts as 11-12 , 13-14
OF is related to the open or close position of device

Attached is the catalog pages for XB7EH range & the datasheets for XB7EH31P & XB7EH35P


Thanks to find the 2 datasheets below :

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 XB7EH31P
http://www.schneider-electric.com/products/ww/en/4800-pushbuttons-switches-pilot-lights-control-stations-joysticks/4840-pushbuttons-switches-pilot-lights/635-harmony-xb7/?p_url=http://www.ops-ecat.schneider-electric.com/ecatalogue/browse.do%3fel_typ=product%26cat_id=BU_AUT_635_L3%26prd_id=XB7EH31P%26scp_id=Z000%26xtmc=XB7EH31P%26xtcr=1


-XB7EH35P
http://www.schneider-electric.com/products/ww/en/4800-pushbuttons-switches-pilot-lights-control-stations-joysticks/4840-pushbuttons-switches-pilot-lights/635-harmony-xb7/?p_url=http://www.ops-ecat.schneider-electric.com/ecatalogue/browse.do%3fel_typ=product%26cat_id=BU_AUT_635_L3%26prd_id=XB7EH35P%26scp_id=Z000%26xtmc=XB7EH35P%26xtcr=1

For your Information :

The reference XB7EH31P is not commercialised and could be replaced by XB7NH31
http://www.schneider-electric.com/products/ww/en/4800-pushbuttons-switches-pilot-lights-control-stations-joysticks/4840-pushbuttons-switches-pilot-lights/635-harmony-xb7/?p_url=http://www.ops-ecat.schneider-electric.com/ecatalogue/browse.do%3fel_typ=product%26cat_id=BU_AUT_635_L3%26prd_id=XB7NH31%26scp_id=Z000%26xtmc=XB7NH31%26xtcr=1

And

The reference XB7EH35P is not commercialised and could be replaced by XB7NH35
http://www.schneider-electric.com/products/ww/en/4800-pushbuttons-switches-pilot-lights-control-stations-joysticks/4840-pushbuttons-switches-pilot-lights/635-harmony-xb7/?p_url=http://www.ops-ecat.schneider-electric.com/ecatalogue/browse.do%3fel_typ=product%26cat_id=BU_AUT_635_L3%26prd_id=XB7NH35%26scp_id=Z000%26xtmc=XB7NH35%26xtcr=1

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