Siemens 7SR45 Reyrolle Overcurrent Protection Relay
The Siemens 7SR45 Reyrolle is a non-directional overcurrent and earth fault relay with self-powered or dual-powered options. It provides both definite and inverse time overcurrent protection with high sensitivity and is suitable for use with CT-powered or auxiliary supply configurations. Compact design with front USB, navigation keys, LCD, and easy integration with Reydisp Evolution PC software ensures user-friendly operation
Technical Specifications
Self-powered / auxiliary powered
10 fault records, 100 event records
Password protection and self-monitoring
Protection functions: Instantaneous and delayed overcurrent, instantaneous and time-delayed earth fault, line check/SOTF
Hardware: 4 CT inputs (1 A or 5 A), up to 4 binary inputs and 4 binary outputs, 2 latched outputs, 1 changeover, 1 normally open, 1 pulsed output, 2 mounting case options
User Interface: 16x2 backlit LCD, menu navigation keys, 9 LEDs, mechanical flag, front USB interface, optional rear RS485 port
Ancillary functions: High-speed external trip via binary input, protection/inrush blocking, lockout
Communications: IEC 60870-5-103, MODBUS RTU
Sensitivity: 20% nominal current
10 fault records, 100 event records
Password protection and self-monitoring
Protection functions: Instantaneous and delayed overcurrent, instantaneous and time-delayed earth fault, line check/SOTF
Hardware: 4 CT inputs (1 A or 5 A), up to 4 binary inputs and 4 binary outputs, 2 latched outputs, 1 changeover, 1 normally open, 1 pulsed output, 2 mounting case options
User Interface: 16x2 backlit LCD, menu navigation keys, 9 LEDs, mechanical flag, front USB interface, optional rear RS485 port
Ancillary functions: High-speed external trip via binary input, protection/inrush blocking, lockout
Communications: IEC 60870-5-103, MODBUS RTU
Sensitivity: 20% nominal current
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