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Master control relay (MCR)
A mandatory hard-wired relay that can be de-energized by any series-connected emergency stop switch. Whenever the master control relay is de-energized, its contacts open to remove the power source from all I/O circuits, sensors and actuators.
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- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Automation
- Category: Industrial automation
- Company: Rockwell Automation
- Product:
- Acronym-Abbreviation:
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