Date Code 20011026 Interface Board Specifications I-5
SEL-321/321-1 Instruction Manual
INTERFACE BOARD 2 (12 OUTPUTS, 8 INPUTS) - SCREW-TERMINAL OR PLUG-
I
N CONNECTIONS
Optoisolated Inputs
All eight control inputs are dry optoisolated inputs, and are not polarity dependent. The screw
terminal version comes with standard fixed inputs while the plug-in version has fixed level-
sensitive inputs. The nominal rated control voltage of 24, 48, 125, or 250 Vdc must be specified
when ordering. To assert an input, apply control voltage to the terminals assigned to that input.
Each input is individually isolated, and a terminal pair is brought out for each input. There are
no internal connections between inputs. The inputs will assert within 2 ms and draw
approximately 4 mA of current at nominal voltage. For further information, see General
Specifications in Section2.
Output Contacts
30 A make
6 A carry
Not rated for interrupting duty
Closing (pickup for “a” contacts, dropout for “b” contacts): 1/4-cycle or less
Opening (dropout for “a” contacts, pickup for “b” contacts): 1/2-cycle or less (typical is
1/4-cycle)
Interface board 2 provides 12 output contacts. These 12 standard dry output contacts have
independent terminals for each pair of contacts and are not polarity dependent. The rear of the
relay will be similar to the following figures:
Figure I.6: Interface Board 2 Output Contacts (Board Position 1)
Figure I.7: Interface Board 2 Output Contacts (Board Position 2)
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