1MDU07205-YN rev. F
REF601 CEI
User’s manual
10
1.4 Document Symbol and Conventions
Dangerous voltages can occur on the connectors, even though the
auxiliary voltage has been disconnected.
National and local electrical safety regulations must always be
followed.
The device contains components which are sensitive to Electrostatic
discharge. Unnecessary touching of electronic components must
therefore be avoided.
Only a competent electrician is allowed to carry out the electrical
installation.
Non-observance can result in death, personal injury or substantial
property damage
Breaking the sealing tape on the upper handle of the device will result in
loss of warranty and proper operation will no longer be guaranteed.
When the plug-in unit has been detached from the case, do not touch
the inside of the case. The relay case internals may contain high
voltage potential and touching these may cause personal injury.
Introduction
1.4.1 Safety information
This publication includes the following icons that point out safety-related conditions
or other important information:
1.4.2 Functions,codes & Symbols
Protection IEC code ANSI code
Three-phase non-directional overcurrent, low-set
stage
3I> 51
Three-phase non-directional overcurrent, high-set
stage
3I>> 50 / 51
Three-phase non-directional overcurrent, very high-
set stage
3I>>> 50 / 51
Non-directional earth-fault, low-set stage Io> 51N
Non-directional earth-fault, high-set stage Io>> 50N/51N
Three phase transformer inrush detector 3I2f> 68
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