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7SR12 Directional Over Current Relay, Protection Relay, Siemens Overcurrent Relays

7SR12 Directional Over Current Relay, Protection Relay, Siemens Overcurrent Relays
7SR12 Directional Over Current Relay, Protection Relay, Siemens Overcurrent Relays
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Product Code : 7SR12
Brand Name : SIEMENS
Price And Quantity
  • Minimum Order Quantity
  • 1 Piece Unit
  • Price Or Price Range
  • INR
Product Description

7SR12 Directional Over Current Relay, Protection Relay, Siemens Over current Relays 



The 7SR12 series of relays provide over current and earth fault protection. These relays are typically applied to provide the main protection on feeders and inter connectors and the back-up protection on items of plant such as transformers. On distribution system circuits over current and earth fault protection is often the only protection installed.The 7SR12 includes for directional control of the over current and earth fault functionality and is typically installed where fault current can flow in either direction i.e. on interconnected systems.The relay functionality allows highly flexible settings for current and time grading making it compatible with all types of over current protections.The relays are available in single and four pole variants housed in E4 cases with the IEC61850 protocol option housed in an E6 case. Integrated logic is provided to allow the optimal configuration of relay functionality with the relays analog inputs and binary input/output circuits.Protection, instrumentation and metering functionality is accessible via data comms channel(s). A front USB port for local PC connection or rear electrical RS485 port for remote connection are provided.


Detail Protection Functions

  • Undercurrent (37)
  • Broken Conductor (46BC)
  • Negative Phase Sequence Overcurrent (46NPS)
  • Thermal Overload (49)
  • Overcurrent (50, 51)
  • Earth Fault (50G, 50N, 50SEF, 51G, 51N, 51SEF)
  • Directional Control of Overcurrent & Earth Fault (67)
  • High Impedance REF (64H)
  • Under/Over Voltage (27/59)
  • Negative Phase Sequence Voltage (47)
  • Voltage Controlled Overcurrent (51V)
  • Neutral Voltage Displacement (59N)

Supervision Functions

  • CT Supervision (60CTS)
  • Trip & Close Circuit Supervision (74T/CCS)
  • VT Supervision (60VTS)
  • Inrush Detector (81HBL2)
  • Circuit Breaker Fail (50BF)

Control Functions

  • Auto Reclose (79)

Monitoring Functions

  • Primary/Secondary Current Phases and Earth Direction
  • Primary/Secondary Line and Phase Voltages
  • Apparent Power and Power Factor
  • Real and Reactive Power
  • W Hr & VAr Hr Forward and Reverse
  • Historical Demand Record
  • Positive Phase Sequence (PPS) Voltage & Current
  • Negative Phase Sequence (NPS) Voltage & Current
  • Zero Phase Sequence (ZPS) Voltage


  • Cold Load Settings
  • Four Settings Groups
  • Password Protection - 2 levels
  • User Programmable Logic
  • Self Monitoring
  • Circuit Breaker Trip Counter and Timer
  • Fault, event and waveform records


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 :09819614841, 09769207841
Mr. Dnyanesh Gawande (Partner)
Mobile :09833686249