1.5
Date Code 20110408 Instruction Manual SEL-551 Relay
Introduction and Specifications
Specifications
250 Vdc: on for 200–300 Vdc;
off below 150 Vdc
Frequency and Rotation
System Frequency: 50 or 60 Hz
Phase Rotation: ABC or ACB
Serial Communications
9-pin sub-D connector
Baud Rate: 300, 1200, 2400, 4800, 9600, 19200,
38400; settable baud rate and
protocol
Protocols
ASCII
Distributed Port Switch Protocol (LMD)
Modbus
®
RTU (rear port only; baud rate limited to 19200)
Operating Temperature
IEC Performance Rating: –40° to +85° C (–40° to +185° F)
Humidity
0% to 95% without condensation
Altitude
2000 m maximum
Operating Environment
Pollution Degree: 2
Overvoltage Category: II
Indoor Use
Tightening Torque
Terminal Block:
Minimum: 0.9 N-m (8-inch-pounds)
Maximum: 1.4 N-m (12-inch-pounds)
Connectorized
®
Minimum: 0.5 N-m (4.4-inch-pounds)
Maximum: 1.0 N-m (8.8-inch-pounds)
Terminal Connections
Terminals or stranded copper wire. Ring terminals are
recommended. Minimum temperature rating of 105°C.
Routine Dielectric Strength
AC current inputs: 2500 Vac for 10 s
Power supply,
optoisolated inputs,
and output contacts: 3000 Vdc for 10 s
The following IEC 60255-5 Dielectric Tests:1977 are performed on all
units with the CE mark:
2500 VAC for 10 s on analog inputs.
3100 Vdc for 10 s on power supply, optoisolated inputs, and output
contacts.
Weight
2.5 kg (5 lbs, 8 oz.)
Type Tests
Environmental Tests
Cold: IEC 60068-2-1:1990 +A1:1993
+A2:1994 [BS EN 60068-2-1:1993
+REAF:2005]
Test Ad; 16 hr at –40°C
Damp Heat Cyclic: IEC 60068-2-30:1980
Test Db; 25° to 55°C,
6 cycles, 95% humidity
Damp Heat Steady State IEC 60068-2-3:1969
Test Ca; 40°C ±2°C,
93% humidity +2%, –3%
4 days, Energized > 1 day
Dry Heat: IEC 60068-2-2:1974 +A1:1993
+A2:1994 [BS EN 60068-2-2:1993
+REAF:2005]
Test Bd: 16 hr at +85°C
Dielectric Strength and Impulse Tests
Dielectric: IEC 60255-5:1977
IEEE C37.90-1989
2500 Vac on analog inputs;
3100 Vdc (3000 Vdc for
Plug-in Connectors option)
on power supply, contact inputs,
and contact outputs
Impulse: IEC 60255-5:1977 0.5 J, 5000 V
Electrostatic Discharge Test
ESD: IEC 60255-22-2:1996
[BS EN 60255-22-2:1997]
IEC 801-2:1991 Level 4
RFI and Interference Tests
Fast Transient
Disturbance:
IEC 60255-22-4:1992
IEC 801-4:1988 Level 4
Radiated EMI: IEC 60255-22-3:1989
IEC 801-3:1984
IEEE C37.90.2-1987
Surge Withstand: IEC 60255-22-1:1988
2.5 kV peak common mode,
1.0 kV peak differential mode
IEEE C37.90.1-1989
3.0 kV oscillatory; 5.0 kV fast
transient
Vibration and Shock Tests
Shock and Bump: IEC 60255-21-2:1988
[BS EN 60255-21-2:1996
+A1:1996] Class 2
IEC 60255-21-3:1993
[BS EN 60255-21-3:1995
+A1:1996] Class 2
Sinusoidal Vibration: IEC 60255-21-1:1988
[BS EN 60255-21-1:1996
+A1:1996]
Class 1 Endurance,
Class 2 Response
Object Penetration
Object Penetration: IEC 60529:1989 IP 30, IP 54 from the
front panel using the SEL-9103
front- cover dust and splash
protection
Product Safety
C22.2 No. 14-95
UL 508
Certifications
ISO: Relay designed and manufactured using ISO 9001 certified
quality program.
Processing Specifications
8 times per power system cycle
Metering Accuracy
Instantaneous and Demand Ammetering Functions.
Currents I
A
, I
B
, I
C
5 A Nominal: ±2% (0.5–80.0 A)
1 A Nominal: ±2% (0.1–16.0 A)
Currents I
N
5 A Nominal: ±5% (0.5–80.0 A)
1 A Nominal: ±5% (0.1–16.0 A)
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