What is the difference between a guard & a safety device?

The difference between a guard and a safety device lies in their function and operation:

Guard:

• A physical barrier that prevents access to hazardous areas.
• Examples: Fixed guards, interlocked guards, barrier guards.
• Function: Blocks direct contact with moving parts or dangerous zones.

Safety Device:

• A sensor-based or control-based mechanism that detects hazards and stops machinery.
• Examples: Light curtains, two-hand controls, safety mats, interlocks.
• Function: Actively stops or disables equipment when a safety zone is breached.

Summary: A guard is a passive, physical barrier, while a safety device actively detects and responds to hazards.