Chapter 1) 7SR242 Duobias Description Of Operation
©2015 Siemens Protection Devices Limited
Chapter 1 Page 15 of 60
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 E8, E10 or E12 cases (where 1 x E = width of approx. 26mm). The hardware design provides commonality
between products and components across the 7SR2 range of relays.
Table 2-1
Summary of 7SR24 Relay Configurations
Relay
Current
Inputs
Voltage
Inputs
Binary
Inputs
Output
Relays
LEDs
Case
7SR2422
8
1
9
6
16
E8
7SR2423
8
1
19
14
24
E10
7SR2424
8
1
39
14
32
E12
Relays are assembled from the following modules:
1) Front Fascia with three fixed function LEDs and ordering options of configurable LEDs.
2) Processor module
3) Analogue Input module ‘A’: 3 x C 6 x Binary Inputs
4) Analogue Input module ‘B’: 5 x C 1 x Voltage.
5) Power Supply and basic Binary Input (BI) and Binary Output (BO).
6) Optional Binary Input/Output Module
7) Optional Binary Input Module
8) Optional data comms module
2.2 Case
The relays are housed in cases designed to fit directly into standard panel racks.
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. Note that when the optional Ethernet comms module is
fitted to the relay the comms cables and the EN100 module rear securing screw must be removed before the
relay assembly is withdrawn.
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.
Summary of Contents for 7SR242 Duobias
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