SIPROTEC easy 7SJ46
Numerical overcurrent protection relay
Description
The SIPROTEC easy 7SJ46 is a numerical overcurrent protection relay which is primarily intended as a radial feeder or transformer protection (backup) in electrical networks. It provides definite-time and inverse-time overcurrent protection according to IEC and ANSI standards. The 7SJ46 relay has an AC and DC auxiliary power supply with a wide range allowing a high degree of flexibility in its application.
Download catalogue, manual, and other detail information.
Function overview
Functions
Universal application due to integrated wide range AC/DC power supply.
Standard current transformers (1 A/5 A)
Easy mounting due to compact housing
Easy connection via screw-type terminals
Protection functions
2-stage overcurrent protection
Definite-time and inverse-time characteristics (IEC/ANSI)
High-current stage
I
>> or calculated earth-current stage
IE
> or
IEp
> selectable
Two command outputs for "trip" or "pickup"
Combination with electromechanical relays is possible due to the emulation algorithm
Front Design
Simple setting via DIP switches (self-explaining)
Settings can be executed without auxiliary voltage - no PC
Individual phase pickup indication with stored or not stored LEDs
Trip indication with separate LED