Follow the warnings described in this manual with the symbols shown below.
DANGER
Warns of a risk, which could result in personal injury or material damage.
ATTENTION
Indicates that special attention should be paid to a speci c point.
If you must handle the unit for its installation, start-up or maintenance, the following
should be taken into consideration:
Incorrect handling or installation of the unit may result in injury to personnel as well as damage
to the unit. In particular, handling with voltages applied may result in electric shock, which may
cause death or serious injury to personnel. Defective installation or maintenance may also
lead to the risk of re.
Read the manual carefully prior to connecting the unit. Follow all installation and maintenance
instructions throughout the unit’s working life. Pay special attention to the installation standards of the National Electrical Code.
Refer to the instruction manual before using the unit
In this manual, if the instructions marked with this symbol are not respected or carried out correctly, it can
result in injury or damage to the unit and /or installations.
CIRCUTOR, SA reserves the right to modify features or the product manual without prior noti cation.
DISCLAIMER
CIRCUTOR, SA reserves the right to make modi cations to the device or the unit speci ca-
tions set out in this instruction manual without prior notice.
CIRCUTOR, SA on its web site, supplies its customers with the latest versions of the device
3�4�1� AS A PROTECTION ELEMENT (MRCD) ����������������������������������������������������� 9
3�4�2� AS A MONITOR (RCM) ������������������������������������������������������������������������������� 10
5�6�1 TRIP CURRENT IΔn and TRIP DELAY TIME td ����������������������������������������������16
5�6�2 PROGRAMMING THE AUXILIARY RELAY, AUX ��������������������������������������� 17
5�6�3 FREQUENCY AND STATUS OF THE OUTPUT RELAY CONTACTS �������� 18
5�6�4 LOCKING THE KEYBOARD ����������������������������������������������������������������������� 19
5�8�- RECLOSING SYSTEM ������������������������������������������������������������������������������������������� 22
5�8�1� “MANUAL” RECLOSING SYSTEM WITH THE RESET KEY ������������������� 22
5�8�2� RECLOSING SYSTEM WITH THE EXTERNAL TEST/RESET INPUT ������ 22
6�- TECHNICAL FEATURES ����������������������������������������������������������������������������������������������� 23
6�1�- DIMENSIONS ��������������������������������������������������������������������������������������������������������� 24
7�- MAINTENANCE AND TECHNICAL SERVICE �������������������������������������������������������������� 25
8�- WARRANTY ������������������������������������������������������������������������������������������������������������������� 25
9�- CE CERTIFICATE ���������������������������������������������������������������������������������������������������������� 26
APPENDIX A: TRIP CURVES ��������������������������������������������������������������������������������������������� 27
4
Instruction Manual
RGU-2 Earth Leakage Relay
REVISION LOG
Table 1: Revision log�
DateRevisionDescription
10/13M98251301-03-13AInitial Version
11/13M98251301-03-13BModied Figure 1
Instruction Manual
5
RGU-2 Earth Leakage Relay
1�- VERIFICATION UPON RECEPTION
Check the following points when you receive the unit:
a) The unit meets the specications described in your order.
b) The unit has not suffered any damage during transport.
c) Perform an external visual inspection of the unit prior to switching it on.
d) Check that it has been delivered with the following:
- a seal to lock the programming button.
- installation guide.
If any problem is noticed upon reception, immediately contact the transport
company and/or CIRCUTOR's after-sales service.
2�- PRODUCT DESCRIPTION
RGU-2 is a protection and/or measurement relay (MRCD/RCM). It is a smart earth leakage
protection system composed of the following elements:
- A detecting element or sensor,
- A relay,
- A circuit breaker,
The unit is fully programmable. It is supplied with the following:
- 3 Keys, used to TEST/RESET and program the unit.
- 2 operation LEDs that display the unit's status.
- LCD Display that displays messages and operation values.
- An LED Bar that displays qualitative level of leakage information.
- Plug-in terminal strips.
The unit is characterised by its reduced dimensions (2 modules mounted on a DIN rail).
It has been designed for single-phase, three-phase or three-phase with neutral low voltage
electrical installations. It is suitable for all neutral rates (VT, TN, IT), either as the main protection
element (MRCD) or for complementary purposes (RCM).
In the case of VT/TN-S systems, it can be used as a MRCD (IEC 60947-2) or a RCM (IEC
62020). It can only be installed as an RCM in other systems.
6
Instruction Manual
RGU-2 Earth Leakage Relay
3�- UNIT INSTALLATION
3.1.- PRIOR RECOMMENDATIONS
In order to use the unit safely, it is critical that individuals who handle it follow the
safety measures set out in the standards of the country where it is being used,
use the personal protection unit necessary, and pay attention to the various warnings indicated in this instruction manual.
The RGU-2 unit must be installed by authorised and qualied staff.
The power supply plug must be disconnected and measuring systems switched off before handling, altering the connections or replacing the unit. It is dangerous to handle the unit while it is
powered.
Also, it is critical to keep the cables in perfect condition in order to avoid accidents, personal
injury and damage to installations.
The manufacturer of the unit is not responsible for any damages resulting from failure by the
user or installer to heed the warnings and/or recommendations set out in this manual, nor for
damages resulting from the use of non-original products or accessories or those made by other
manufacturers.
In the event an anomaly or malfunction is detected in the unit, refrain from using it to make any
measurements.
Inspect the work area before making any measurements. Do not take measurements in dangerous areas or where there is a risk of explosion.
Disconnect the unit from the power supply (unit and measuring system power
supply) before maintaining, repairing or handling the unit's connections.
Please contact the after-sales service if you suspect that there is an operational
fault in the unit.
Instruction Manual
7
RGU-2 Earth Leakage Relay
3.2.- INSTALLATION
The unit is installed on a DIN rail.
All active conductors that supply the loads or the part of the installation where the earth leakage protection with this unit is required must pass through the sensor associated with the unit.
The unit must be mounted inside an electric panel.
Likewise, it must be connected to a fuse-protected power circuit, in accordance with its power
supply range and consumption. In turn, the power circuit must be tted with a circuit breaker
switch or an equivalent device, in order to be able to disconnect the unit from the power supply
mains.
Note: The connection diagram suggests a cable section of 1- 1.5 mm.
Recommended torque 0.5-0.6 Nm.
Terminals, opening covers or removing elements can expose parts that are hazardous to the touch while the unit is powered
3.3.- UNIT TERMINALS
Table 2: Unit terminals�
Unit terminals
1, 2 : External current sensor input.8: External Test/Reset input with button.
3, 6, 10, 12: Not used9, 11: Auxiliary Power Supply
4: Prealarm/Fault relay output: NO Contact13: Trip relay output: NO Contact