2657A-PM-200 Protection Module (PM) is a stand-alone module that protects certain lower-voltage source-measure units (SMUs) that are part of a testing configuration from damage by voltage sources that are greater than 220 V.

The protection module is intended for use in applications where a device breakdown or other potential failure could connect the high-voltage output of the Model 2657A High Power System SourceMeter Instrument to a lower voltage SMU.