Siemens SIPROTEC 5 7SK85 Motor Protection Relay
Siemens SIPROTEC 5 7SK85 Motor Protection Relay Suppliers,Exporters in India
ARP IMPEX is a supplier and exporter of Siemens SIPROTEC 5 7SK85 Motor Protection Relays in India. We handle requirements for large motors, medium-voltage motor control panels, power plants, pumping stations, process industries, retrofit projects and replacement of existing Siemens motor protection relays.
The Siemens SIPROTEC 7SK85 is a modular motor protection relay designed for motors of different sizes and ratings. Compared with a compact motor relay, the 7SK85 provides more flexibility for projects that need motor differential protection, additional current and voltage inputs, more binary contacts, temperature monitoring or multiple communication interfaces.
The relay monitors the motor during starting, normal running and abnormal operating conditions. It can detect excessive starting time, thermal overload, locked rotor, repeated starts, current unbalance, short circuits, earth faults and loss of mechanical load. Motor differential protection can also be configured for high-power motors where fast fault clearance is required.
Temperature monitoring can be added through an external RTD unit to supervise motor winding and bearing temperatures. This is useful for critical pumps, compressors, fans, mills and other motors where overheating can result in costly downtime.
The modular SIPROTEC 5 hardware allows the input, output and communication arrangement to match the motor protection panel. Expansion modules can be added where the project requires more contacts or control functions. The relay is available with different display arrangements, depending on the ordered Siemens article number.
ATEX-certified versions are available for motors installed in applicable explosive environments. The certification must be confirmed against the complete Siemens MLFB before quotation.
Siemens DIGSI 5 is used for relay settings, logic, testing and commissioning. IEC 61850 and other communication options allow the relay to connect with motor control systems, SCADA and substation automation networks.
For the Siemens SIPROTEC 7SK85 price, availability or export quotation, share the complete Siemens part number, required quantity and destination country.
Technical Specifications
- Brand: Siemens
- Product family: SIPROTEC 5
- Model: 7SK85
- Product type: Modular numerical motor protection relay
- Main application: Protection, control and monitoring of motors of all sizes
- Tripping: Three-pole motor tripping
- Current inputs: Four current-transformer inputs in standard variants
- Voltage inputs: Four voltage-transformer inputs in standard variants
- Binary inputs: 11 to 27, depending on hardware selection
- Binary outputs: 9 to 17, depending on hardware selection
- I/O expansion: Additional SIPROTEC 5 expansion modules can be fitted
- Display options: Large display, small display or no display
- Temperature monitoring: Through an external RTD temperature-measuring unit
- Engineering software: Siemens DIGSI 5
- Communication: Integrated Ethernet with optional communication modules
- IEC 61850: Available for reporting, GOOSE and system integration
- Control functions: Motor control, synchrocheck and switchgear interlocking
- Power-quality monitoring: Basic voltage and harmonic measurements
- Certification: ATEX-certified versions available
- Construction: Modular SIPROTEC 5 hardware with coated electronic modules
The precise analogue inputs, binary contacts, expansion modules, display, communication protocols and certification depend on the complete Siemens ordering code.
Main Motor Protection Functions
Depending on the selected configuration, the Siemens SIPROTEC 7SK85 can provide:
- Motor starting-time supervision
- Thermal overload protection for the stator and rotor
- Restart-inhibit protection
- Starts-per-hour supervision
- Locked-rotor and load-jam protection
- Current unbalance and phase loss protection
- Motor differential protection
- Directional and non-directional overcurrent protection
- Sensitive earth-fault protection
- Undercurrent and loss-of-load protection
- Undervoltage and overvoltage protection
- Motor winding and bearing temperature monitoring
- Arc protection
- Active- and reactive-power protection
- Motor control and switchgear interlocking
The enabled functions depend on the ordered relay. A basic configuration may not include the same differential, temperature-monitoring or communication functions as a 7SK85 selected for a large critical motor.
Features
- Protects motors during starting and continuous operation
- Suitable for small, medium and large motor applications
- Motor differential protection provides fast short-circuit detection
- Detects prolonged starting and blocked-rotor conditions
- Thermal modelling helps protect the stator and rotor from overheating
- Restart inhibit prevents another start before the motor has cooled
- Current-unbalance protection detects phase loss and unequal loading
- Undercurrent protection can identify dry running or loss of load
- External RTD monitoring checks motor winding and bearing temperatures
- Sensitive earth-fault protection helps detect stator insulation faults
- Expandable inputs and outputs suit complex motor control panels
- Programmable logic supports motor starting, control and interlocking
- DIGSI 5 is used for configuration and commissioning
- IEC 61850 supports connection with modern plant and substation systems
- Fault and disturbance records assist with trip analysis
- ATEX-certified versions are available for applicable hazardous areas
- Coated electronic modules support operation in demanding industrial conditions
- Suitable for new installations, retrofit projects and relay replacement
The main difference between the SIPROTEC 7SK85 and the compact 7SK82 is the 7SK85’s modular hardware and broader application range. It is better suited to projects that require differential protection, expandable I/O or more detailed control and communication functions.
Applications
Siemens SIPROTEC 5 7SK85 Motor Protection Relays are used for:
- Large medium-voltage motors
- High-power induction motors
- Synchronous motors
- Critical process motors
- Boiler feed pumps
- Cooling-water pumps
- Oil and gas transfer pumps
- Water and wastewater pumping stations
- Large compressors
- Industrial fans and blowers
- Crushers, mills and grinding equipment
- Conveyors and material-handling systems
- Mixers, agitators and process drives
- Power-plant auxiliary motors
- Refinery and petrochemical plant motors
- Steel and cement plant motors
- Mining and mineral-processing equipment
- Marine and offshore motor applications
- Hazardous-area motor installations
- Motor control centre and switchgear panels
- Motor protection-panel retrofit projects
- Replacement of older Siemens motor relays
The 7SK85 is particularly useful for important motors where a trip can stop production or affect plant safety. Motor differential protection, temperature monitoring and detailed fault records make it suitable for high-value pumps, compressors, fans and process drives.
Selecting the Correct Siemens 7SK85 Relay
“Siemens SIPROTEC 7SK85” does not identify one fixed relay configuration. Models can differ by current and voltage inputs, binary contacts, expansion modules, display type, temperature monitoring, communication ports and ATEX certification.
For an accurate quotation, share:
- Complete Siemens article number or MLFB
- Required quantity
- Destination country
- Communication requirement, where applicable
For replacement requirements, also share clear photographs of the existing relay nameplate and rear terminal arrangement.
If the Siemens article number is unavailable, share the existing relay model and confirm whether the application requires motor differential protection, RTD temperature monitoring or ATEX certification.
Siemens SIPROTEC 5 7SK85 Supplier and Exporter in India
ARP IMPEX supplies Siemens SIPROTEC 5 7SK85 Motor Protection Relays for switchgear manufacturers, EPC contractors, panel builders, power plants, utilities and industrial maintenance companies.
We handle enquiries for:
- Siemens SIPROTEC 5 7SK85 Motor Protection Relays
- Motor differential protection relays
- Large MV motor protection relays
- Thermal overload and locked-rotor protection relays
- Motor relays with RTD temperature monitoring
- Protection relays for pumps and compressors
- ATEX-certified Siemens motor protection relays
- SIPROTEC motor relays with IEC 61850
- Replacement Siemens numerical motor relays
- Motor protection-panel retrofit requirements
The Siemens SIPROTEC 7SK85 price depends on the complete article number, hardware configuration, differential protection requirement, expansion modules, temperature-monitoring arrangement, communication interface and ordered quantity.
Send the complete Siemens part number, required quantity and destination country for price, availability and export quotation.
