Siemens MAGNETOM Avanto Operator's Manual page 42

2 Safety
(1) Magnet Stop switch
(2) Emergency Shut-down/System Off switch
(3) Table Stop button
Magnet Stop switch The Magnet Stop switch triggers a controlled magnet quench
(shutting down the magnetic field). The MR system is not
disconnected from the power.
There are two different versions of the Magnet Stop switch on the
MR system: as an individual switch or as an integral part of the alarm
box. The switches may also be installed in other places of the MR
system.
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MR System | Operator Manual
Print No. MR-01501G.621.02.02.02