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Chapter 1) 7SR17 Rho Description Of Operation
Section 2: Hardware Description
2.1
G
ENERAL
The structure of the relay is based upon the 7SR1 hardware platform. The relays are supplied in size E4 cases.
The hardware design provides commonality between products and components across the 7SR1 range of relays.
Table 2-1
Summary of 7SR17 Rho Relay Configurations
Relay
Current
Inputs
7SR1702
4
7SR1703
4
7SR1705
4
7SR1706
4
2.2
C
ASE
The relays are housed in cases designed to fit directly into standard panel racks. The case has a width of 104mm
(E4) and a height of 177 mm (4U).
The complete relay assembly is withdrawable from the front of the case. Contacts in the case ensure that the CT
circuits remain short-circuited when the relay is removed. To withdraw the relay, remove the plastic fascia cover
by rotating the two securing pins and withdraw using the plastic handles. The relay should not be carried using
these handles. The relay should only be held by the top and bottom plates and the user should not touch the
exposed PCB's.
The rear terminal blocks comprise M4 screw terminals for wire connections. Each terminal can accept two 90
degree ring tongue crimps.
Located at the top rear of the case is a screw clamp earthing point, this must be connected to the main panel
earth.
See Chapter 5 (Installation Guide) for full details of panel cut-out and internal clearance requirements.
Page 14 of 78
Voltage
Binary
Output
Inputs
Inputs
Relays
-
3
-
6
3
3
3
6
Figure 2-1 Rear view of Relay
LEDs
Case
5
10
E4
8
10
E4
5
10
E4
8
10
E4
©2014 Siemens Protection Devices Limited
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