Catalogs > Safety Products Catalog > Logic > Safety Relays > Specialty Safety Relays > Two-Hand Relays > MSR7R & MSR7C
MSR7R & MSR7C
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Description
The Allen-Bradley Guardmaster Minotaur MSR7R & MSR7C are logic units for monitoring and interfacing two hand control devices with a safety related circuit. The MSR7R is for use with mechanical switches and the Allen-Bradley Bulletin 800Z Zero Force Touch Buttons. The MSR7C is for use with electronic-sensing (for example, capacitive or photoelectric) palm buttons because the MSR7C will not turn its output ON if a power interruption occurs while a person’s hands are on the buttons.
The MSR7 has 3 N.O. safety outputs and 1 N.C. auxiliary output. The safety outputs have independent and redundant internal contacts to help ensure the safety function. The auxiliary contact is a nonsafety output intended to provide an external signal about the status of the safety outputs.
The MSR7 requires the two switches to be operated within 0.5 seconds of each other and will only authorize the ON state while both switches are held down. If one of the switches is released, the output goes to the OFF state and the machine cannot be restarted until both buttons are released and then operated simultaneously.
The MSR7 conforms to EN574 which gives specific requirements for two hand control units and logic devices. Categories IIIB or IIIC are achieved depending upon the wiring.
Features
- Safety category 3 per EN 954-1
- Safety category IIIb per EN 574
- Two-hand control unit
- 3 N.O. safety outputs
- 1 N.C. auxiliary output
- 45 mm wide housing
Applications
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