positive break vs. force guided 1

[StephWri]

Is there a difference between a contact described as positive-break versus one described as force-guided? I think they are actually of different construction but am confused by my readings of many descriptions.

 

[dbaird]

Force Guided Contacts (Linked contacts):
All-or-nothing relay with at least one break contact and at least one make contact designed in such a way that it
is made sure by mechanical means that make and break contacts can not be in closed position simultaneously.
Also known as: forced contacts, positively activated contacts, guided contacts, and linked contacts.

Positive Opening Operation (of a contact element)
The achievement of contact separation as the direct result of a specified movement of the switch actuator
through non-resilient members (e.g.: not dependent on springs).The term Positive Opening is used throughout
NFPA 79, and in IEC 60947-5-1, and EN 60947-5-1. Direct Opening is the term referred to in NEMA ICS-5, part
6 (direct opening action). The terms Positive Opening and Direct Opening identify the same contact action and
characteristics.

David Baird

Sr Controls Designer
EET degree.
Journeyman Electrician.