Date Code 20010731 Installation 2-7
SEL-352-1, -2 Instruction Manual
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.
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, and many industry applications have proven the performance of these
connectors. In addition, we have tested these connectors thoroughly to be certain that they
conform to our standards for protective relay applications.
Terminal Block
Make terminal block connections with size #6–32 screws using a Phillips or slotted screwdriver.
You may request locking screws from the factory. Figure 2.6 and Figure 2.7 are examples of
relays with rear-terminal connections. Refer to the figures at the end of this section to make all
terminal block connections.
Connectorized
To use the Connectorized version of the SEL-352 Relay, ask your SEL sales or customer service
representative for the appropriate model option table and order wiring harness kit
WA03520YxxxA, where x designates wire sizes and length. You can find the model option
table on the SEL website at http://www.selinc.com. Refer to Figure 2.8 to make all
Connectorized connections.
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