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SEL-751A and SEL-751 Comparison

Standard Feature

Model Option

Common features are not listed in this comparison. For more information, visit the product pages.

SEL-751A and SEL-751 FeaturesSEL-751ASEL-751
Display/Front Panel
5" Color Touchscreen Display, 800 × 480 Resolution 
4 Front-Panel Pushbuttons With Tricolor LEDs, Customizable 
8 Front-Panel Pushbuttons With Tricolor LEDs, Customizable 
CT/PT Inputs
Low-Energy Analog (LEA) Voltage Inputs 
Undervoltage Load Shedding
Protection Elements
27I Inverse Time Undervoltage 
49R Resistance Temperature Detector 
49T IEC Line/Cable Thermal Overload 
50INC Incipient Cable Fault Detection 
51G Residual Time-Overcurrent With Directional Control 
51N Neutral Time-Overcurrent With Directional Control 
51P Max. Phase Time-Overcurrent With Directional Control 
51Q Negative-Sequence Time-Overcurrent With Directional Control 
59I Inverse Time Overvoltage 
67G Residual Overcurrent With Directional Control 
67N Neutral Overcurrent With Directional Control 
67P Max. Phase Overcurrent With Directional Control 
67Q Negative-Sequence Overcurrent With Directional Control 
78VS Vector Shift 
81 Over-/Underfrequency
FLOC Fault Locator 
HBL Second- and Fifth-Harmonic Blocking 
HIF AST Arc Sense Technology (AST) High-Impedance Fault Detection 
Load-Encroachment Supervision  
Instrumentation and Control
Arc-Flash Detection inputs44 or 8
Data Acquisition16 samples/cycle32 samples/cycle
Event Report15 or 64 cycles15, 64, or 180 cycles
Web Server 
Firmware Download Via the Ethernet port  
14 Digital Inputs Card Support 
Incoming GOOSE Messages Support1664
Synchronized Phasor MeasurementUp to 10 messages/second60 messages/second at 60 Hz
Fault Locator 
Bay Control 
Communications Protocols
IEC 61850 Edition 2  
IEC 60870-5-103 
Parallel Redundancy Protocol (PRP) 
IEEE 1588 Firmware-Based Precision Time Protocol (PTP) 


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