Final answer:
A connector described as self-closing and self-locking, marked with breaking strength and manufacturer information, is likely a Class B connector, used for safety in industries like construction.
Step-by-step explanation:
A connector that is self-closing and self-locking, which can only be opened by at least two consecutive deliberate manual actions and is marked with its breaking strength in the major axis and the name or trademark of the manufacturer, is likely referring to a safety device commonly used in situations where fall protection is necessary, such as in construction or industrial environments. These connectors are typically categorized into classes based on their specific characteristics and performance requirements. Given the attributes mentioned in the question, such a connector would be classified as a Class B connector.