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Resource category 3 contains break help contacts of different kinds.

 

"Break" is the correct term according to the IEC standard. Other popular terms for the same thing is "normally closed", "NC", and "opening".

 

Please note that when contacts are booked towards contact mirrors, different kinds of break help contacts are separated. A delayed break contact and a conventional break contact are for example not considered to be same thing.

 

At delivery, function codes for all common types of break help contacts are predefined. Would a need for additional types occur, it is easy to add more.

 

Break contacts are not considered to have a direction and not to be asymmetric, even though that is not true geometrically speaking. From a functional perspective, it is however true. Therefore, these symbols are available in two versions each, one vertical and one horizontal.