Schweitzer Engineering Laboratories SEL-352-1, Instruction Manual

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2-28 Installation Date Code 20010731
SEL-352-1, -2 Instruction Manual
Interface Board 4 (4 Outputs, 16 Inputs)
Optoisolated Inputs
All eight control inputs are dry optoisolated inputs and are not polarity dependent. Input options
are 24 Vdc standard or 48, 110, 125, or 250 Vdc level sensitive. Control voltage 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. See
General Specifications in Section 1:
Introduction and Specifications for ratings.
Output Contacts
30 A make
6 A carry
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 4 provides four “standard independent” output contacts. These four standard
independent dry output contacts have terminals for each pair of contacts and are not polarity
dependent. The rear of the relay will be similar to the following figures:
Figure 2.24: Interface Board 4 Output Contacts and Inputs (Board Position 1)
Figure 2.25: Interface Board 4 Output Contacts and Inputs (Board Position 2)