2.5
Date Code 20110408 Instruction Manual SEL-551 Relay
Installation
Rear-Panel Connections
Figure 2.5 SEL-551 Front Panel, Rack-Mount Version (Half-Rack Width)
Figure 2.6 SEL-551 Front Panel, Panel-Mount Version
Rear-Panel Connections
We provide two options for secure connection of wiring to the relay rear
panel. One of these is the conventional terminal block, in which you use size
#6-32 screws to secure rear-panel wiring. The other option uses plug-in
(Connectorized) connections that offer robust connections while minimizing
installation and replacement time. These connections are intended for use with
copper conductors only.
Connectorized rear-panel connections reduce repair time dramatically in the
unlikely event that a relay should fail. These connections greatly simplify
routine bench testing; connecting and disconnecting rear-panel wiring takes
only a few minutes.
Connectorized relays use a current shorting connector for current inputs, a
plug-in terminal block that provides maximum wiring flexibility for inputs
and outputs, and a quick disconnect voltage-rated connector for voltage
inputs. The manufacturers of these connectors have tested them thoroughly,
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