1.10
SEL-749M Relay Instruction Manual Date Code 20080918
Introduction and Specifications
Specifications
Surge Withstand Capability
Immunity:
IEC 60255-22-1:2005
2.5 kV common-mode
2.5 kV differential-mode
1 kV common-mode on comm. ports
IEEE C37.90.1–2002
3 kV oscillatory
5 kV fast transient
Conducted RF Immunity: IEC 61000-4-6:2004 [BS EN 61000-4-
6:1996 + C:DRG:2001]
10 Vrms
Magnetic Field Immunity: IEC 61000-4-8:2001 [BS EN 61000-4-
8:1994 + A1:2001]
1000 A/m for 3 seconds
100 A/m for 1 minute
EMC Emissions
Conducted Emissions: EN 55011:1998 + A1:1999 + A2:2002
Radiated Emissions: EN 55011:1998 + A1:1999 + A2:2002,
Class A
Showering Arc NEMA
ICSI-2000 Severity Level: 1.5 kV
Electromagnetic Compatibility
Product Specific: EN 50263:1999 [BS EN 50263:2000],
IEC 60947-4-1:2002 [BS EN 60947-4-
1:2001 + A1:2003],
IEC 60947-5-1:2003 [BS EN 60947-5-
1:2004]
Certifications
ISO: Relay is designed and manufactured
using ISO 9001 certified quality
program.
UL/CSA: CSA C22.2 No. 61010-1,
IEC 61010-1:2001 [BS EN 61010-
1:2001]
UL 61010-1.
CE: CE Mark–EMC Directive
Low Voltage Directive
Hazardous Locations
Approvals:
Complies with UL 1604, CSA 22.2
No. 213, and EN 60079-15.
Environmental Conditions
Typical conditions under which the relay is designed to operate:
Indoor Use
Altitude: up to 2000 m
Temperature: –40° to +85°C (–40° to +185°F)
(UL/CSA Safety Rating +70°C [158°F]
maximum)
(+60°C [140°F] maximum with
DeviceNet Communications Card)
Relative Humidity: 5 to 95%
Maintains supply voltage fluctuations up to ±10% of nominal voltage
Overvoltage Category: II
Pollution Degree: 2
Atmospheric Pressure 80–110 kPa
Processing Specifications
AC Voltage and
Current Inputs: 16 samples per power system cycle
Digital Filtering: One-cycle cosine after low-pass analog
filtering. Net filtering (analog plus
digital) rejects dc and all harmonics
greater than the fundamental.
Protection and
Control Processing: 4 times per power system cycle
Relay Elements
Thermal Overload (49)
Full Load Current
(FLA) Limits: 0.2–5000.0 A primary
Locked Rotor Current: (2.5–12.0) • FLA
Hot Locked Rotor Time: 1.0–600.0 seconds
Service Factor: 1.01–1.50
Accuracy: 5% ±25 ms at multiples of FLA > 2
(cold curve method)
NOTE: FLA is a setting (see the Main Settings (SET Command) of the
SEL-749M Settings Sheets at the end of Section 6 for setting ranges).
PTC Overtemperature (49)
Type of Control Unit: Mark A
Max. Number of
Thermistors: 6 in a series connection
Undercurrent (Load Loss) (37)
Setting Range: Off, (0.10–1.00) • FLA
Accuracy: ±5% of setting
±0.02 • I
NOM
A secondary
Current Imbalance and Phase Loss (46)
Setting Range: Off, 5–80%
Accuracy: ±10% of setting
±0.02 • I
NOM
A secondary
Overcurrent (Load Jam)
Setting Range: Off, (1.00–6.00) • FLA
Accuracy: ±5% of setting
±0.02 • I
NOM
A secondary
Short Circuit (50P)
Setting Range: Off, (0.10–20.00) • FLA
Accuracy: ±5% of setting
±0.02 • I
NOM
A secondary
Ground Fault (50G)
Setting Range: Off, (0.10–1.00) • FLA
Accuracy: ±5% of setting
±0.02 • I
NOM
A secondary
Ground Fault (50N)
Setting Range: Off, 0.01–25.00 A
Accuracy: ±5% of setting ± 0.01 A secondary
Courtesy of NationalSwitchgear.com
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