Schweitzer Engineering Laboratories SEL-352-1 - Model Options; Conventional Terminal Blocks; Plug-In Connectors (Connectorized ); SEL-352-1 Relay

Date Code 20010731 Introduction and Specifications 1-5
SEL-352-1, -2 Instruction Manual
A three-level password scheme protects settings and circuit breaker control. The SEL-352 Relay
monitors password execution and closes the ALARM contact output to indicate possible
unauthorized access. The relay requires no special communications software. Access the relay
with a dumb terminal, printing terminal, or computer with serial port and terminal emulation
software.
MODEL OPTIONS
SEL-352-1 Relay
The SEL-352-1 Relay has provided sophisticated and reliable service for many years. It
continues to satisfy the needs of most of our customers. However, we recommend using the
SEL-352-2 Relay for new designs because of the additional features it provides.
SEL-352-2 Relay
The SEL-352-2 Relay provides the following additional features:
 Overcurrent elements for detecting RMS overcurrent conditions on a per-pole or three-
phase basis (50R, 50RA, 50RB, and 50RC).
 Percent Wear function for estimating the amount of breaker contact wear per pole.
 BREAKER W command for preloading the number of operations, total current, total
energy, and percent wear fields in the operation summary on a per-pole basis.
 Optional Distributed Network Protocol (DNP) 3.00 Level 2 Slave communications
protocol.
Conventional Terminal Blocks
This model includes hardware that supports three current inputs, six voltage inputs, six
optoisolated inputs, seven programmable output contacts, one alarm contact, three EIA-232 ports,
one EIA-485 port, and IRIG-B time code. It uses terminal blocks that support #6 ring terminals.
This robust package meets or exceeds numerous industry standard type tests.
This relay is available in a 3.50" (2U), 5.25" (3U), or 7.00" (4U) rack-mount package or 4.9",
6.65", or 8.40" panel-mount package. Additional optoisolated inputs and programmable output
contacts are available with the larger packages.
Plug-In Connectors (Connectorized
®
)
This model includes hardware that supports all of the features of the conventional terminal blocks
model. It differs in that it uses plug-in connectors instead of terminal blocks. In addition, it
provides
 Quick connect/release hardware for rear-panel terminals.
 Level-sensitive optoisolated inputs.
This robust package meets or exceeds numerous industry standard type tests. It is available in a
5.25" (3U) rack-mount package or a 4.9" panel-mount package.