Section 2: Hardware Description; General; Case; Table 2-1 Summary Of Overcurrent Relay Configurations - Siemens 7SR21 Manual
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Section 2: Hardware Description
2.1
General
The structure of the relay is based upon the Multi-function hardware platform. The relays are supplied in either
size E6 or size E8 cases (where 1 x E = width of 26mm). The hardware design provides commonality between
products and components across the Multi-function range of relays.
Table 2-1
Summary of Overcurrent Relay Configurations
Relay
Current
Inputs
7SR2102
4
7SR2103
4
7SR2104
4
7SR2202
5
7SR2203
5
7SR2204
5
Relays are assembled from the following modules:
1.
Front Fascia with three fixed function LEDs and ordering options of configurable LEDs/Function Keys.
2.
Processor module
3.
Analogue Input module, either
•
4 x Current + 6 x Binary Inputs + 2 x Binary Outputs (7SR21), or
•
5 x Current + 4 x Voltage (7SR22).
4.
Power Supply and Basic Binary Input (BI) and Binary Output (BO).
5.
Optional Binary Input/Output Module
•
10 x Binary Inputs + 8 x Binary Outputs
6.
Optional Communications Module (2x rear fibre optic + 1x IRIG-B ports), (1x rear RS485 + 1x IRIG-B
port), (1x rear RS232 + 1x IRIG-B port)
2.2
Case
The relays are housed in cases designed to fit directly into standard panel racks. The two case options have
widths of 156mm (E6) and 208 mm (E8), both have a height of 177 mm (4U). The required panel depth (with
wiring clearance) is 242 mm. An additional 75 mm depth clearance should be allowed to accommodate the
bending radius of fibre optic data communications cables if fitted.
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.
The rear terminal blocks comprise M4 female terminals for wire connections. Each terminal can accept two 4mm
crimps.
Located at the top rear of the case is a screw clamp earthing point, this must be connected to the main panel
earth.
©2010 Siemens Protection Devices Limited
Voltage
Binary
Inputs
Inputs
9
19
19
4
3
4
13
4
13
7SR21 & 7SR22 Argus Description of Operation
Output
LEDs
Relays
8
8
16
16
16
8
6
8
14
16
14
8
Function
Case
Keys
E6
E8
6
E8
E6
E8
6
E8
Chapter 1 Page 14 of 71
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