This standard applies to control switches according to IEC Standard 337-1, with two definite positions (such as push-buttons, limit-switches and similar devices), irrespective of their construction, having terminal marking in accordance with the corresponding marking of contactor relays designated by the distinctive letter E (see EN 50 011). The use of this standard is recommended where terminal marking is a requirement of the relevant standard for control switches, or is usual practice.
SIS SS EN 50 013-1989由SE-SIS 发布于 1989-9-13。
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