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General| Rated Current | 1 A / 5 A |
|---|---|
| Frequency | 50/60 Hz |
| Display | Graphical LCD |
| Rated Voltage | 24-250 V DC / 100-240 V AC |
| Communication Protocols | IEC 61850, DNP3, Modbus |
| Communication Interfaces | Ethernet, RS485 |
| Protection Functions | Overcurrent, Earth Fault, Over/Under Voltage, Frequency Protection |
| Operating Temperature | -25°C to +55°C |
| Storage Temperature | -40°C to +70°C |
| Mounting | Panel Mount |
| Housing | Plastic |
| Weight | 2.5 kg |
Legal statement regarding the accuracy and completeness of the publication content.
Information regarding intellectual property rights and permitted usage of the document.
Lists trademarks registered by Siemens and other companies.
Specifies that only qualified personnel should commission and operate the equipment.
Outlines the intended applications and conditions for the equipment's use.
Overview of the device's functionality, including inputs and transformer ratios.
Details on setting transformation ratios for low-power current transformers.
Setting the rated current and ground current for the primary object.
Parameters for measuring ground currents and setting LPCT polarity.
Parameters for setting rated input voltage and phase offset for LPVTs.
Guidance on checking LPCT compatibility and calculating measurable current.
Using sensitive low-power current transformers for small ground currents.
Instructions for mounting the device in various housing types.
Overview of available connectors for device connections.
Details on wiring low-power current and voltage transformers using RJ45.
Wiring information for auxiliary power, binary inputs, and outputs.
Specifications for connecting single wires using appropriate lugs and cross-sections.
Mechanical specifications for connecting temperature sensors.
Pin assignment for the USB socket used for PC connection.
Description of electrical and optical Ethernet connection options.
Pin assignment for IEC 60870-5-103 redundant interface ports.
Use of Port A for DIGSI communication and RTD box connection.
Use of Port B for system interface, RTD box, or DIGSI communication.
Measuring range, accuracy, and protection accuracy for current inputs.
Secondary rated voltage, measuring range, and accuracy for voltage inputs.
How temperature affects current and voltage measurement accuracy.
Permissible voltage ranges and ripple for direct and alternating power supply.
Rated direct voltage range and maximum permissible voltage for binary inputs.
Switching capability, voltage, current, and capacitors for output relays.
Operating, storage, and transport temperature ranges for the device.
IP ratings for front and back of the device and protection against contact.
Ordering selection for the core 7SJ81 protection device features.
Options for voltage inputs, binary inputs, and binary outputs for 7SJ81.
Selection of default region and language for the 7SJ81 device.
Communication interface selection for Port B on the 7SJ81.
Specific additional interface options for Port B on the 7SJ81.
Ordering options for converters like SIEMENS OLM for 7SJ81.
Ethernet port selection for Port A on the 7SJ81.
Ordering specific protection function sets for the 7SJ81.
Options for AR and FL functions in 7SJ81 ordering.
Ordering selection for the core 7SK81 protection device features.
Options for voltage inputs, RTD inputs, and binary inputs/outputs for 7SK81.
Selection of auxiliary voltage for the 7SK81 device.
Selection of default region and language for the 7SK81 device.
Communication interface selection for Port B on the 7SK81.
Specific additional interface options for Port B on the 7SK81.
Ordering options for converters like SIEMENS OLM for 7SK81.
Ethernet port selection for Port A on the 7SK81.
Ordering specific protection function sets for the 7SK81.
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