The 3171EExed is a low cost vibration sensitive switch for the protection of rotating plant and reciprocating machinery operating in Hazardous areas. It is adjustable to operate above the normal running levels of vibration, activating alarm or machine shut-down circuits.

Once operated the internal microswitch remains latched until reset.

The 3171EExed vibration switch, with its low frequency response, makes it ideal for detection of mass unbalance on most machines. It is inherently insensitive to high frequency components and those caused by external knocks, etc.