Schweitzer Engineering Laboratories SEL-321 - General Specifications

Date Code 20011026 Specifications 2-51
SEL-321/321-1 Instruction Manual
GENERAL SPECIFICATIONS
Terminal Connections:
Rear Screw-Terminal Tightening Torque:
Minimum: 8-in-lb (0.8 Nm)
Maximum: 12-in-lb (1.4 Nm)
Terminals or stranded copper wire. Ring terminals are recommended.
Minimum temperature rating of 105°C.
AC Current Inputs:
5 A nominal
15 A continuous, linear to 100 A symmetrical.
500 A for 1 second.
1250 A for 1 cycle.
Burden: 0.27 VA @ 5 A
2.51 VA @ 15 A
1 A nominal
3 A continuous, linear to 20 A symmetrical.
100 A for 1 second.
250 A for 1 cycle.
Burden: 0.13 VA @ 1 A
1.31 VA @ 3 A
AC Voltage Inputs:
67 V
L-N
, three-phase four-wire connection.
150 V
L-N
continuous (connect any voltage up to 150 Vac).
365 Vac for 10 seconds.
Burden: 0.13 VA @ 67 V
0.45 VA @ 120 V.
Power Supply:
Rated: 125/250 Vdc or Vac
Range: 85–350 Vdc or 85–264 Vac
Burden: < 25 W
Rated: 48/125 Vdc or 125 Vac
Range: 38–200 Vdc or 85–140 Vac
Burden: < 25 W
Rated: 24/48 Vdc
Range: 18–60 Vdc polarity dependent
Burden: < 25 W
Output Contacts:
Standard
30 A make
6 A continuous carry
100 A for one second
MOV protected: 270 Vac, 360 Vdc
Pickup time: < 5 ms
Dropout time: < 8 ms
Breaking Capacity (10,000 operations):
48 V 0.5 A L/R = 40 ms
125 V 0.3 A L/R = 40 ms
250 V 0.2 A L/R = 40 ms
Cyclic Capacity (2.5 cycles/second):
48 V 0.5 A L/R = 40 ms
125 V 0.3 A L/R = 40 ms
250 V 0.2 A L/R = 40 ms
Note: Make per IEEE C37.90–1989; Breaking and Cyclic Capacity
per IEC 60255-23–1994.