Installing Plug-In Unit - ABB SMU615 Installation Manual

Section 4
Mounting
4.2.2
12
GUID-905CFF67-6B1B-429B-B2C5-B28EC60B40A0 V1 EN
Figure 2: Detaching a plug-in unit from the case
The merging unit 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.
Do not touch terminals inside the case after removing the plug-in unit.
Live terminals can be inside the case.
The signal connectors are left open when the plug-in unit is detached.

Installing plug-in unit

The merging unit is constructed in a way that a plug-in unit with voltage- or current-
measuring inputs can only be plugged into a corresponding case. This prevents fitting
an unsuitable plug-in unit into a wrong case.
1MRS758405 C
SMU615
Installation Manual