7SR45 Installation Guide
© 2017 Siemens Protection Devices Limited Chapter 5 Page 3 of 6
Section 1: Installation Guide
1.1 Installation
Execute the following procedure to install the 7SR45 Self Powered Overcurrent and Earth Fault Relay:
1. Create a slot of dimensions as shown in Figure 1-2 to house the relay in the protection panel.
2. Flush the rear-side of relay into the protection panel cut-out.
3. Fasten the relay using the four M4x20 Pan Phillips SS screws with nut provided in the 7SR45 packing
box to the protection panel/cubicle.
4. Carry-out all other installation steps/wiring internally from the protection panel.
5. In the rear terminal of the relay, execute the wiring process as mentioned in scheme requirements.
Refer figure for more details about the terminal connector diagram. Refer the Table 1-1 for the
recommended terminal lugs to be used.
6. The earthing cable should be wired using a non-stranded cable of 2.5 mm
2
/4 mm
2
and this should be
terminated in the shortest possible path to the earth terminal/bus bar in panel or cubicle.
7. Maintain a minimum clearance from the relay as given in Figure 1-1 to ensure safety and accidental
touch of terminals. In case of work area is restricted in a cubicle, then suitable protective terminals to
be provided in the cubicle.
NOTE:
The earthing point (E) of auxiliary supply is connected to the ground (GND) point of the relay. The earth
connection of relay casing should be solidly connected to the panel earth.
Figure 1-1 7SR45 Clearance for Terminal Wiring
To Next Page
Loading...
Need help?
General