U.1.15
Date Code 20090715 User’s Guide SEL-421 Relay
Introduction and Specifications
Specifications
Operating Temperature
SEL-421:
–40° to +85°C (–40° to +185°F)
SEL-421 with Ethernet card:
–40° to +75°C (–40° to +167°F)
Note: LCD contrast impaired for temperatures below –20° and
above +70°C
Humidity
5% to 95% without condensation
Weight (Maximum)
3U Rack Unit:
4U Rack Unit:
5U Rack Unit:
17.5 lbs (8.0 kg)
21.5 lbs (9.8 kg)
25.5 lbs (11.6 kg)
Terminal Connections
Rear Screw-Terminal Tightening Torque, #8 Ring Lug
Minimum:
Maximum:
1.0 Nm (9 in-lb)
2.0 Nm (18 in-lb)
User terminals and stranded copper wire should have a minimum
temperature rating of 105°C. Ring terminals are recommended.
Wire Sizes and Insulation
Wire sizes for grounding (earthing), current, voltage, and contact
connections are dictated by the terminal blocks and expected load
currents. You can use the following table as a guide in selecting
wire sizes:
Use wire with 0.4 mm-thick insulation for high-voltage
connections to allow for contact between adjacent wires. If
possible, use 0.4 mm insulated wires for all connections.
Routine Dielectric Strength Tests
(Performed on Each Manufactured Relay)
AC Current Inputs,
optoisolated inputs, and
output contacts: 2500 Vac for 10 s
Power Supply: 3100 Vdc for 10 s
Type Tests
Electromagnetic Compatibility (EMC)
Electromagnetic
Emissions: EN 50263:1999
Emissions: IEC 60255-25:2000
Electromagnetic Compatibility Immunity
Conducted RF Immunity: ENV 50141:1993, 10 V rms
IEC 60255-22-6:2001, 10 V rms
Connection Type
Minimum
Wire Size
Maximum
Wire Size
Grounding (Earthing)
Connection
18 AWG
(0.8 mm
2
)
14 AWG
(2.5 mm
2
)
Current Connection 16 AWG
(1.5 mm
2
)
12 AWG
(4 mm
2
)
Potential (Voltage)
Connection
18 AWG
(0.8 mm
2
)
14 AWG
(2.5 mm
2
)
Contact I/O 18 AWG
(0.8 mm
2
)
14 AWG
(2.5 mm
2
)
Other Connection 18 AWG
(0.8 mm
2
)
14 AWG
(2.5 mm
2
)
Digital Radio
Telephone RF:
ENV 50204:1995, 10 V/m at 900 MHz
and 1.89 GHz
Electrostatic Discharge: IEC 60255-22-2:1996, Levels 1, 2, 3, 4
IEC 61000-4-2:1995, Levels 1, 2, 3, 4
IEEE C37.90.3-2001,
Levels 2, 4, and 8 kV contact;
Levels 4, 8, and 15 kV air
Fast Transient
Disturbance:
IEC 61000-4-4:1995,
IEC 60255-22-4:1992,
4 kV at 2.5 and 5 kHz
Magnetic Field
Immunity:
IEC 61000-4-8:1993
850 A/m for 3 seconds
IEC 61000-4-9:1993 850 A/m
Power Supply Immunity: IEC 61000-4-11:1994, 5 cycles
IEC 60255-11:1979
Radiated Radio
Frequency:
ENV 50140:1993,
IEC 60255-22-3:1989
IEC 61000-4-3:1998 10 V/m
IEEE C37.90.2-1995, 35 V/m
Exceptions:
DC Battery System Monitor 10 V/m
(
±10% ± 3 V)
Ethernet card installed, 10 V/m
Surge Withstand: IEC 60255-22-1:1988,
2.5 kV peak common mode
2.5 kV peak differential mode
IEEE C37.90.1-1989,
3.0 kV oscillatory
5.0 kV fast transient
Environmental
Cold: IEC 60068-2-1:1990
[EN 60068-2-1:1993]
Test Ad: 16 hours at –40°C
Dry Heat: IEC 60068-2-2:1974
[EN 60068-2-2:1993],
Test Bd: Dry heat, 16 hours at +85° C
Damp Heat, Cyclic: IEC 60068-2-30:1980,
Test Db: 55°C, 6 cycles,
95% humidity
Object Penetration: IEC 60529:1989, IP30
Vibration: IEC 60255-21-1:1988, Class 1
IEC 60255-21-2:1988, Class 1
IEC 60255-21-3:1993, Class 2
Safety
Dielectric Strength: IEC 60255-5:1977,
IEEE C37.90-1989,
2500 Vac on control inputs, control
outputs, and analog inputs
3100 Vdc on power supply
Impulse: IEC 60255-5:1977, 0.5 J, 5 kV
Insulation Resistance: IEC 60255-5:1977,
Resistance @ 500 V >1 minute.
Resistance 10 MΩ–100 MΩ
Class 1 LED Product
Safety (optional
Ethernet card):
IEC 60825-1:1993 + A1:1997
+ A2:2001,
ANSI Z136.1-1993, Class 1
ANSI Z136.2-1988, Service Group 1
Certifications
ISO: Relay is designed and manufactured
using ISO 9001:2000 certified quality
program.
Product Safety: IEC 60255-6:1988 [EN 60255-6:1994]
Courtesy of NationalSwitchgear.com
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