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Siemens Overcurrent Protection 7sr1004 Numerical Relay

Siemens Overcurrent Protection 7sr1004 Numerical Relay
Siemens Overcurrent Protection 7sr1004 Numerical Relay
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Product Code : 7SR1004
Product Description

The Reyrolle 7SR10 Argusovercurrent and earth fault relay is a numerical overcurrent protection relayintended as a low-cost solution for distribution and industrialapplications.The Reyrolle 7SR10 Argus overcurrent and earth fault relay isdeveloped using the latest generation of hardware technology and is availablein multiple variants depending on the power supply, Binary input/binary outputconfiguration and data communication facility.Housed in a 4U high, size 4non-draw-out case and these relays provide protection, monitoring,instrumentation, and metering with integrated input and output logic, datalogging, and fault reports. Communication access to the relay functionality isvia a front USB port for local PC connection or rear electrical RS485(optional) port for remote connection.

  • It has Universal power supply suitable for both AC and DC. 
  • 1A and 5A CT selectable at site. Basic communication protocol like MODBUS RTU and IEC 103 available and they are also site selectable. Relay are equipped with sufficient number of DI/DO i.e. upto 6 DI and 6 DO. 
  • 7SR1003 is designed for current based protection and 7SR1004 is available with additional voltage inputs to take care of voltage based protections. 7SR1005 is designed for motor protection application.


  •  Current Inputs: 4
  •  Voltage Inputs : 3
  •  Binary Inputs : 9
  •  Binary Outputs: 6
  •  LEDs: 10

Four overcurrent elements are provided in the 7SR1004 relay.50-1, 50-2, (50-3 & 50-4 – 7SR1004) Each overcurrent element (50-n) hasindependent settings. 50-n Setting for pick-up current and 50-n Delay followertime delay. The instantaneous elements have transient free operation. Wheredirectional elements are present the direction of operation can be set using50-n Dir. Control setting. Directional logic is provided independently for each50-n element, e.g. giving the option of using two elements set to forward andtwo elements set to reverse.

Four under/over frequency elements are provided in the 7SR1004relay .The relay utilises fundamental voltage measurement values for thisfunction. The frequency calculation is based on the highest input voltagederived from the voltage selection algorithm. The relay utilises fundamentalfrequency RMS voltage for this function. All under/over frequency elements havea common setting to measure phase to phase (Ph-Ph) or phase to neutral (Ph-N)voltage using the Frequency Input mode setting. Frequency elements are blockedif all phase voltages fall below the 81 U/V Guard setting. The sense of theelement (under-frequency or over-frequency) is set by the 81-n Operationsetting.


Office No.-9, Plot 53/54, Sector-34, Space Heights, Near Tawa Hotel, Kamothe, Navi Mumbai - 410209, Maharashtra, India
Mr Piyush Lalchand Rathi (Partner)
Mobile :+919819614841, +919769207841
Mr. Dnyanesh Gawande (Partner)
Mobile :+919833686249