Which device can be used to sense if a guard is in place and is a specific type of switch?

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The concept here is devices that verify a safety guard is in place and prevent machine operation if it isn’t. A safety interlock switch is built specifically for guarding applications—it's a switch that detects whether a guard or access door is closed and provides a safety interlock signal to the control system. This lets the machine know the guard is secured and can only run when closed, stopping automatically if the guard opens. Other sensors don’t serve this dedicated guarding role: a proximity sensor detects nearby objects but not guard status, a limit switch is a general position detector, and a pressure switch responds to force rather than guard presence. So the safety interlock switch is the right choice because it is designed to sense guard status and enforce safe access control.