2-52 Specifications Date Code 20011026
SEL-321/321-1 Instruction Manual
High-current interrupting option
30 A make
6 A continuous carry
MOV protected: 330 Vdc
Pickup time: < 5 ms
Dropout time: < 8 ms, typical
Breaking Capacity (10,000 operations):
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
250 V 10 A L/R = 20 ms
Cyclic Capacity (4 cycles/second, followed
by 2 minutes idle for thermal dissipation):
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
250 V 10 A L/R = 20 ms
Note: Do not use high-current interrupting output contacts to switch
ac control signals. These outputs are polarity dependent.
Note: Make per IEEE C37.90–1989; Breaking and Cyclic Capacity
per IEC 60255-23–1994.
Fast high-current interrupting option
30 A make
6 A continuous carry
MOV protected: 330 Vdc
Pickup time: < 200 µs
Dropout time: < 8 ms, typical
Breaking Capacity (10,000 operations):
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
250 V 10 A L/R = 20 ms
Cyclic Capacity (4 cycles/second, followed
by 2 minutes idle for thermal dissipation):
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
250 V 10 A L/R = 20 ms
Note: Fast high-current interrupting output contacts are not
polarity
dependent. See Appendix I for further details.
Note: Make per IEEE C37.90–1989; Breaking and Cyclic Capacity
per IEC 60255-23–1994.
Optoisolated Input Ratings:
Standard fixed inputs (operating voltage shown)
250 Vdc: Pickup 150–300 Vdc
125 Vdc: Pickup 80–150 Vdc
48 Vdc: Pickup 30–60 Vdc
24 Vdc: Pickup 15–30 Vdc
Fixed level-sensitive inputs
250 Vdc: Pickup 200–300 Vdc; dropout 150 Vdc
125 Vdc: Pickup 105–150 Vdc; dropout 75 Vdc
48 Vdc: Pickup 38.4–60 Vdc; dropout 28.8 Vdc
Note: Nominal input current is 4 mA.
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