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Schweitzer Engineering Laboratories

Feeder Protection Relay, SEL-751A
Type:  Misc. Hardware
Description:  Feeder Protection: Maximize control scheme flexibility with time- and instantaneous- overcurrent, overvoltage, undervoltage, and frequency elements. Use the four programmable pushbuttons on the front panel for quick, personalized control. Choose from Ethernet or serial communications and several protocols, including MIRRORED BITS? and IEC 61850. Pick a single Modbus? TCP or multiple Modbus Serial sessions for custom configuration of your application.
Connectivity:  Modbus, Modbus TCP
Features:  Flexible I/O for Local Control and System Applications; Base system includes three digital outputs and two digital inputs. There are three card slots for optional SELECT I/O cards, including: Four digital inputs (DI) and four digital outputs (DO); Four digital inputs (DI) and four fast, high-current interrupting digital outputs (DO); Four digital outputs (DO), three digital inputs (DI), and one analog output (AO); Four analog inputs (AI) and four analog outputs (AO); Eight analog inputs (AI) for dc process values; Eight digital inputs (DI); Three ac voltage inputs; Ten RTD inputs
Specifications:  Choose from Ethernet, fiber-optic serial, EIA-232, EIA-485, Modbus Serial, MIRRORED BITS, DeviceNet?, Modbus TCP, Telnet, IEC 61850, and File Transfer Protocols.