(1) Description of Operation 7SR224
Page 10 of 66 ©2009 Siemens Protection Devices Limited
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 a size E10 or E12 case (where 1 x E = width of approx. 26mm). The hardware design provides
commonality between products and components across the Multi-function range of relays.
Table 2-1 Summary of Controller Relay Configurations
Relay Current
Inputs
Voltage
Inputs
Binary
Inputs
Output
Relays
LEDs Function
Keys
Case
7SR2241 4 6 13 14 8 12 E10
7SR2242 4 4 13 14 8 12 E10
7SR2243 4 4 23 22 8 12 E10
7SR2244 4 4 33 14 8 12 E10
7SR2245 4 6 23 22 8 12 E10
7SR2246 4 4 33 14 16 12 E12
7SR2247 4 4 33 30 16 12 E12
7SR2248 4 4 43 22 16 12 E12
Relays are assembled from the following modules:
1) Front Fascia with three fixed function LEDs, Function Keys and ordering options of configurable
LEDs.
2) Processor module.
3) Analogue Input module - 4 x Current + 4 or 6 x Voltage.
4) Power Supply (PSU) and Basic Binary Input (BI) and Binary Output (BO).
5) Binary Input/Output Module.
6) Data Comms module (optional)
2.2 CASE
The relays are housed in cases designed to fit directly into standard panel racks. The case has a width
of 260mm (E10), 312mm (E12) and a height of 177 mm (4U). The required panel depth for wiring
clearance is 242 mm and 287mm 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. Shorting contacts on the rear
connection block in the case ensure that the CT circuits remain short-circuited when the relay is
removed.
External connections to the rear terminal block are made via M4 screws. Each terminal can accept two
4mm crimps.
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