siemens
Siemens 7SR11 Argus Overcurrent Protection Relay
Model: 7SR1101-1JA20-0DA0
4-hour response · Pricing in SAR · Delivery across all KSA regions
7SR1101-1JA20-0DA0 — Siemens 7SR11 Argus Overcurrent Protection Relay
The Siemens Reyrolle 7SR11 Argus is a fully numerical overcurrent and earth-fault protection relay covering both directional and non-directional applications for MV distribution feeders, transformer incomers, and motor protection in secondary distribution substations. Built on the Reyrolle numerical platform, the 7SR11 integrates overcurrent protection (50/51), directional overcurrent (67/67N), earth-fault (50N/51N), sensitive earth-fault (50Ns), and a four-shot auto-reclose function (79) in a compact 4U 19-inch flush-mount housing. The relay's fixed-function architecture — all protection logic is pre-engineered and validated at the factory — means commissioning requires only protection setting entry via the front keypad or relay configuration software, with no function-block programming required. This approach reduces commissioning time compared to fully configurable IEDs, making the 7SR11 well-suited for straightforward feeder and motor protection applications where rapid deployment and simple maintenance are priorities.
The 7SR11 provides three-phase overcurrent inputs with independently adjustable definite-time and inverse-time (IDMT) characteristics per IEC 60255-151, including standard IEC Standard Inverse (SI), Very Inverse (VI), and Extremely Inverse (EI) curves as well as British Standard special curves. Sensitive earth-fault sensitivity as low as 0.02 × In addresses high-impedance earth faults on resistance-grounded and ungrounded MV networks common in Saudi distribution substations. IEC 61850 Edition 1 communication provides GOOSE messaging for fast intertripping and integration into SCADA systems, while RS-485 Modbus RTU communication supports integration with legacy SCADA platforms without IEC 61850 infrastructure. The auxiliary supply range of 24–250 V DC/AC covers all substation auxiliary supply standards encountered in Saudi MV installations, including both battery-backed 110 V DC substations and 230 V AC panel-powered secondary distribution boards.
In Saudi Arabia, the 7SR11 is widely deployed in MV ring-main unit protection panels at SEC secondary distribution substations throughout the Kingdom's major cities, in industrial substation feeder protection panels at SABIC and ARAMCO facilities, and as a retrofit replacement for aging electromechanical relays in existing distribution substations undergoing protection panel refurbishment. NEOM's primary distribution network and Jubail Industrial City's extensive private MV distribution system both include 7SR11 installations for feeder protection at ring-main switching substations where the relay's compact size and straightforward commissioning reduce project schedule risk. The relay's IEC 61850 capability allows integration into the digital protection schemes increasingly specified by SEC and ARAMCO for new and refurbished substations in the Kingdom.
Razz Middle East supplies Siemens Reyrolle 7SR11 relays for both new installation and like-for-like replacement of older Reyrolle and competitor numerical relays in Saudi distribution substations, with 4-hour RFQ response, SAR pricing, and full protection setting commissioning support. We hold spare relays and can deliver to all major Saudi cities and industrial zones within 24–48 hours.
Technical Specifications
Full specifications for the 7SR1101-1JA20-0DA0
- Protection Functions
- 50/51 OC, 67/67N Directional OC, 50N/51N EF, 50Ns SEF, 79 AR (4-shot), 50BF CB Fail
- Current Inputs
- 3 × CT phase + 1 × NEF CT
- Voltage Inputs
- 3 × VT (for directional functions)
- IDMT Characteristics
- IEC SI, VI, EI + special curves (IEC 60255-151)
- Communication
- IEC 61850 Ed1 GOOSE, Modbus RTU (RS-485)
- Auxiliary Supply
- 24–250 V DC/AC
- Mounting
- 4U flush panel, 19" rack
- Standard
- IEC 60255
Key Features & Benefits
- Fixed-function numerical architecture pre-validates all protection logic at the factory, reducing commissioning to setting entry only — no function-block programming required, cutting substation protection commissioning time by up to 50% versus fully configurable IEDs.
- Directional overcurrent (67/67N) and sensitive earth-fault (50Ns at 0.02 × In) cover both solidly-grounded and resistance-grounded MV distribution networks, providing comprehensive feeder protection for all SEC and industrial network earthing configurations in Saudi Arabia.
- Four-shot auto-reclose (79) with independently configurable dead-times restores supply automatically after transient overhead line faults on Saudi 13.8 kV and 33 kV distribution feeders, reducing customer interruption minutes without operator intervention.
- IEC 61850 Edition 1 GOOSE messaging enables fast bus protection interlocking between adjacent feeder relays and integration into digital substation SCADA platforms at SEC and ARAMCO substations.
- IEC 60255-151 inverse-time characteristics including Standard Inverse (SI), Very Inverse (VI), and Extremely Inverse (EI) provide time-graded protection coordination with upstream and downstream devices across Saudi distribution hierarchies.
- Auxiliary supply range 24–250 V DC/AC covers all Saudi substation auxiliary supply standards — battery-backed 110 V DC secondary substations through 230 V AC panel-powered distribution points — from a single relay model.
- Compact 4U flush-mount housing enables direct retrofit into existing relay panel cutouts at Saudi distribution substations undergoing protection refurbishment without panel mechanical modification.
Industrial Applications in Saudi Arabia
- SEC secondary MV distribution substation feeder protection at 13.8 kV and 33 kV ring-main unit installations throughout Riyadh, Jeddah, Dammam, and the Eastern Province, where four-shot auto-reclose maximises supply restoration after transient overhead line faults.
- Industrial MV distribution feeder protection at SABIC Jubail and Yanbu petrochemical complex ring-main substations, where directional overcurrent function protects bidirectional power flow on ring-main feeders.
- Motor protection at MV switchgear panels for large 6.6 kV and 11 kV motors at ARAMCO processing facilities, where the 7SR11's thermal model and locked-rotor detection protect critical process pump and compressor motors.
- Transformer incomer protection at 13.8/0.4 kV unit substations serving MODON industrial estate factories and commercial buildings, where the relay provides overcurrent and earth-fault protection for transformer secondary windings.
- Protection panel refurbishment projects replacing aging electromechanical relays at Saudi secondary distribution substations, where the 7SR11's compact 4U housing enables like-for-like replacement without relay panel modifications.
- NEOM primary distribution network ring-main substation protection, where IEC 61850 GOOSE communication integrates the 7SR11 into the project's digital substation protection and SCADA architecture.
- Underground cable feeder protection in Riyadh and Jeddah urban MV distribution networks, where sensitive earth-fault detection at 0.02 × In identifies early cable insulation degradation before complete failure.
Industrial Supplier in Saudi Arabia
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Common questions from buyers in Saudi Arabia and the GCC