Section 4 1MAC303209-MB C
Mounting
12 620 series
Installation Manual
Figure 2: Detaching a plug-in unit from the case
4.2.2 Installing the plug-in unit
The IED is constructed in such a way that a plug-in unit with voltage or current measuring
inputs can only be plugged into a corresponding case. This prevents fitting a non-suitable
plug-in unit into the wrong case.
1. Lift the handle to its fully opened position (90 degrees).
2. Push the plug-in unit into the case as far as it goes.
The IED features an automatic short-circuit mechanism in the CT
connector. Therefore, detaching the plug-in unit will not open the
secondary circuit of the CT which could cause dangerously high voltages.
The signal connectors are left open when the plug-in unit is detached.
Before fitting the plug-in unit into the case, check that the unit and the case
have the same serial number.
Forcing a non-suitable plug-in unit into the case can break both the plug-in
unit and the case and may cause injury.
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