Otherwise known as a torque limiter these devices protect mechanical equipment from damage by mechanical overload. A torque limiter may limit the torque by slipping a friction plate clutch or disconnect the load entirely. The action of a torque limiter is useful to limit any damage to the machine or product due to mechanical failures or product jams in the machine. Torque limiters are typically installed on the output side of gear reducers to protect the gear set. They come in two varieties in air engaged (also known as Air Champ) or mechanical torque limiters.