Contact Person: IVY ZHANG
Tel: +86 022 84995960
Mobile Phone: +86 13902042869
E-mail: info@ot-automation.com
SKype: IVY ZHANG-CHINA ONE-TONE
Whatsapp: +86 13902042869
Add: Room 103-27, No. 3 Xianggang Street, Jinnan Economic Development Zone, Tianjin, China
The SIPROTEC easy 7SJ45 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 7SJ45 relay does not require auxiliary voltage supply. It imports its power supply from the current transformers.
Standard current transformers (1 A/5 A) Low power consumption: 1.4 VA at IN (of the relay) Easy mounting due to compact housing Easy connection via screw-type terminals 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 Trip with pulse output (24 V DC / 0.1Ws) or relay output (changeover contact) Repetition of trip during circuit-breaker failure (relays with pulse output) Combination with electromechanical relays is possible due to the emulation algorithm Hardware and software are continuously monitored during operation Simple setting via DIP switches (self-explaining) Settings can be executed without auxiliary voltage – no PC Integrated mechanical trip indication optionally Optional version available for most adverse environmental conditions (condensation permissible) Flush mounting or surface (rail) mountingOperation without auxiliary voltage via integrated CT power supply
Protection functions
Monitoring functions
Front design
Additional features
