SATEC EM132-133 Manual - Manual (Page 20)

‎Chapter 2 Installation
20 EM13x Series SMART MULTIFUNCTION METER
Add-On Module Mounting
Before Add-On Module installation ensure that all incoming
power sources are shut OFF. Failure to observe this practice
can result in serious or even fatal injury and damage to
equipment.
Turn off the EM13X Series auxiliary power supply or voltage supply
inputs (SE model).
Remove the module connector cover from the EM13X Series to access
the module connector as shown in figure 2-4below
Figure ‎2-4. EM13X Series module connector location
Figure ‎2-5. EM13X Series module assembly