Rockwell Automation now offers improved E-Stop reliability for critical process control applications with new Allen-Bradley Self Monitoring™ Contact Blocks (SMCB). For use with 800T and 800 push buttons, the patent pending Self Monitoring Contact Blocks monitor whether or not they are properly installed on the E-Stop operator.

Why You Need SMCBs
Proper contact block installation is critical to ensure that the normally closed contacts will open when the E-Stop is actuated. Separation of the contact blocks from the E-Stop operator will prevent the E-Stop from shutting down the controlled process in an emergency. Consider the following dangerous scenarios that could potentially result in contact block separation:

• Mounting screws were over-tightened, resulting in stripped threads.
• Contact block latch not completely «snapped-on» to the E-Stop operator
• Contact block or latch is accidentally damaged during maintenance
• Contact block or latch is removed and not reinstalled during maintenance

The new Self Monitoring Contact Block eliminates these separation concerns by actually monitoring its own installation. If the SMCB is separated from the E-Stop operator for any reason, the controlled circuit will automatically open.

Specification Overview:

• Same ratings as existing 800T shallow and 800E standard contact blocks respectively
• Color-coded yellow for easy identification
• IP2X finger safe protection
• Terminals identified with IEC style markings
• Patent Pending