1.10
SEL-351A Relay Instruction Manual Date Code 20080213
Introduction and Specifications
Specifications
Specifications
General
AC Current Input
Nominal: 5 A
Continuous: 15 A
1 Second Thermal: 500 A linear to 100 A symmetrical
1250 A for 1 cycle
Burden: 0.27 VA at 5 A, 2.51 VA at 15 A
Nominal: 1 A
Continuous: 3 A
1 Second Thermal: 100 A linear to 20 A symmetrical
250 A for 1 cycle
Burden: 0.13 VA at 1 A, 1.31 VA at 3 A
Additional Neutral Channel IN Options (Not in SEL-351A-1)
Nominal: 0.2 A
Continuous: 15 A
1 Second Thermal: 500 A linear to 5.5 A symmetrical
1250 A for 1 cycle
Burden: 0.002 VA at 0.2 A, 1.28 VA at 15 A
Nominal: 0.05 A
Continuous: 1.5 A
1 Second Thermal: 20 A linear to 1.5 A symmetrical
100 A for 1 cycle
Burden: 0.0004 VA at 0.05 A,
0.36 VA at 1.5 A
Note: The 0.05 A option is a legacy nondirectional SEF protection
option. The 0.2 A option provides nondirectional SEF protection,
plus directional protection for various system grounding
practices.
AC Voltage Inputs
300 V
L-N
continuous limit for three-phase, four-wire wye
connection
300 V
L-L
continuous limit for three-phase, three-wire delta
connection (connect any voltage up to 300 Vac)
600 Vac for 10 seconds
Burden: 0.03 VA at 67 V
0.06 VA at 120 V
0.80 VA at 300 V
Power Supply
125/250 Vdc or Vac
Range: 85–350 Vdc or 85–264 Vac
(50/60 Hz)
Burden: <25 W
48/125 Vdc or 125 Vac
Range: 38–200 Vdc or 85–140 Vac
(50/60 Hz)
Burden: <25 W
24/48 Vdc
Range: 18–60 Vdc
Burden: <25 W
Control Outputs
Standard:
Make: 30 A
Carry: 6 A continuous carry at 70°C
4 A continuous carry at 85°C
1s Rating: 50 A
MOV Protection: 270 Vac/360 Vdc, 40 J
Pickup Time: <5 ms
Breaking Capacity (10000 operations):
24 V 0.75 A L/R = 40 ms
48 V 0.50 A L/R = 40 ms
125 V 0.30 A L/R = 40 ms
250 V 0.20 A L/R = 40 ms
Cyclic Capacity (2.5 cycles/second):
24 V 0.75 A L/R = 40 ms
48 V 0.50 A L/R = 40 ms
125 V 0.30 A L/R = 40 ms
250 V 0.20 A L/R = 40 ms
Note: Make rating per IEEE C37.90-1989.
Optoisolated Inputs
DC Range
250 Vdc: Pickup 200–300 Vac; Dropout 150 Vac
220 Vdc: Pickup 176–264 Vac; Dropout 132 Vdc
125 Vdc: Pickup 105–150 Vdc; Dropout 75 Vdc
110 Vdc: Pickup 88–132 Vdc; Dropout 66 Vdc
48 Vdc: Pickup 38.4–60 Vdc; Dropout 28.8 Vdc
24 Vdc: Pickup 15.0–30 Vdc
AC Range
250 Vdc: Pickup 170.6–300 Vac;
Dropout 106.0 Vac
220 Vdc: Pickup 150.3–264.0 Vac;
Dropout 93.2 Vac
125 Vdc: Pickup 89.6–150 Vac; Dropout 53 Vac
110 Vdc: Pickup 75.1–132 Vac;
Dropout 46.6 Vac
48 Vdc: Pickup 32.8–60 Vac; Dropout 20.3 Vac
24 Vdc: Pickup 12.8–30 Vac
Note: 24, 48, 125, 220, and 250 Vdc optoisolated inputs draw
approx. 5 mA of current, 110 Vdc inputs draw approx. 8 mA of
current. All current ratings are at nominal input voltages.
Frequency and Rotation
System Frequency: 60 or 50 Hz
Phase Rotation: ABC or ACB
Frequency Tracking
Range:
40.1–65 Hz
Note: V
A
or V
1
required for frequency tracking.
Communications Ports
EIA-232: 1 Front and 2 Rear
EIA-485: 1 Rear; 2100 Vdc of isolation
Data Speed: 300–38400 bps (38400 is not available
on Port 1.)
Courtesy of NationalSwitchgear.com
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