1.9
Date Code 20080918 Instruction Manual SEL-749M Relay
Introduction and Specifications
Specifications
Optoisolated Control Inputs
When Used With dc Control Signals
250 V ON for 200–275 Vdc OFF below 150 Vdc
220 V ON for 176–242 Vdc OFF below 132 Vdc
125 V ON for 100–135.5 Vdc OFF below 75 Vdc
110 V ON for 88–121 Vdc OFF below 66 Vdc
48 V ON for 38.4–52.8 Vdc OFF below 28.8 Vdc
24 V ON for 15–30 Vdc OFF for < 5 Vdc
When Used With ac Control Signals
250 V ON for 170.6–300 Vac OFF below 106 Vac
220 V ON for 150.3–264 Vac OFF below 93.2 Vac
125 V ON for 85–150 Vac OFF below 53 Vac
110 V ON for 75.1–132 Vac OFF below 46.6 Vac
48 V ON for 32.8–60 Vac OFF below 20.3 Vac
24 V ON for 14–27 Vac OFF below 5 Vac
Current Draw at
Nominal dc Voltage:
2–6 mA
Except for 220 V and 250 V (2 mA)
and 24 V (10 mA)
Rated Insulation Voltage: 300 Vac
Rated Impulse Withstand
Voltage (U
imp
): 4000 V
Analog Output (Optional)
Single Analog Current
Output:
4–20 mA
Max Load: 300 ohms
Error: < ±0.5%, Full Scale
Select From: FLA; % Thermal Capacity; Hottest
Winding RTD; Hottest Bearing RTD;
Avg. Phase Current; Max. Phase
Current; Power; Power Factor
Frequency and Phase Rotation
System Frequency: 50, 60 Hz
Phase Rotation: ABC, ACB
Frequency Tracking: 44–66 Hz
Time-Code Input
Format: Demodulated IRIG-B
On (1) State: V
ih
≥ 2.2 V
Off (0) State: V
il
≤ 0.8 V
Input Impedance: 2 kΩ
Accuracy: ±3 milliseconds
Communications Ports
Standard EIA-232 (2 ports)
Location: Front Panel
Rear Panel
Data Speed: 300–38400 bps
Optional Communications Card
Option 1: Modbus RTU Protocol or ASCII
Protocol over EIA-232 or EIA-485
Option 2: DeviceNet Protocol
Dimensions
Refer to Figure 2.1 for relay dimensions.
Weight
2.0 kg (4.4 lbs)
Terminal Connections
Current Inputs Terminal Block Tightening Torque
Minimum: 0.9 Nm (8 in-lb)
Maximum: 1.4 Nm (12 in-lb)
Compression Plug Tightening Torque
Minimum: 0.5 Nm (4.4 in-lb)
Maximum: 1.0 Nm (8.8 in-lb)
Type Tests
Environmental Tests
Enclosure Protection: IEC 60529:2001
IP65 enclosed in panel
IP20 for terminals
Vibration Resistance: IEC 60068-2-6:1995
3 G, 10–150 Hz
IEC 60255-21-1:1988, Class 1
IEC 60255-21-3:1993, Class 2
Shock Resistance: IEC 60255-21-2:1988, Class 1
Cold: IEC 60068-2-1:1990
–40°C, 16 hours
Damp Heat, Steady State: IEC 60068-2-78:2001
40°C, 93% relative humidity, 4 days
Damp Heat, Cyclic: IEC 60068-2-30:1980
25–55°C, 6 cycles,
95% relative humidity
Dry Heat: IEC 60068-2-2:1993
–40° to +80°C, (–40° to +176°F)
Dielectric Strength and Impulse Tests
Dielectric (HIPOT): IEC 60255-5:2000
IEEE C37.90-1989
2.5 kVac on current inputs
2.0 kVac on ac voltage inputs,
contact I/O
1.0 kVac on PTC input
and analog output
2.83 kVdc on power supply
Impulse: IEC 60255-5:2000
0.5 J, 4.7 kV on power supply, contact
I/O, ac current and voltage inputs
0.5 J, 530 V on PTC and analog output
RFI and Interference Tests
EMC Immunity
Electrostatic Discharge
Immunity:
IEC 61000-4-2:2001 [BS EN 61000-4-
2:1995 + A1: 1999 + A2: 2001]
8 kV contact discharge
15 kV air discharge
Radiated RF Immunity: IEC 61000-4-3:2002, 10 V/m
IEEE C37.90.2-2004, 35 V/m
Fast Transient, Burst
Immunity:
IEC 61000-4-4:1995 + A1:2000
+ A2:2001 [BS EN 61000-4-4:1995
+ A1:2001 + A2:2002]
4 kV @ 2.5 kHz
2 kV @ 5.0 kHz for comm. ports
IEEE C37.90.1-2002, 5 kV
Surge Immunity: IEC 61000-4-5:1995 + A1:2001 [BS EN
61000-4-5:1995 + A1:1996]
2 kV line-to-line
4 kV line-to-earth
Courtesy of NationalSwitchgear.com
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