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2.
INSTALLATION
2.1. General
Relays plug directly into a mounting base that is secured to a rack. See Section 2.5 for
proper relay insertion.
2.2. Mounting Base
Secure the mounting base directly to the rack using the hardware furnished. All wiring
terminates at the rear of the mounting base to solderless terminals (contact
receptacles). Mounting base details are shown in Appendix A.
2.3. Relay Indexing
Relays are factory equipped with indexing pins to prevent insertion of an incorrect relay
into a mounting base. Each relay is accompanied by an indexing plate that is applied to
the mounting base at the time of initial installation. A typical plug-in relay with indexing
pins and base with corresponding indexing plate are shown in Figure 2-1.
The following data defines the indexing established for relays covered by this manual.
1. The index code always consists of four digits (such as 0001, 0002 or 0101). The
index code is used for both the relay and the indexing plate on the mounting
base.
RELAY
Figure 2-1. Typical Plug-in Relay and Mounting Base
Copyright 2019
0 1 2 3
MOUNTING BASE
SM 5929 Rev. 23, March 2019
PN-152SO Switch Overload Relay
INDEXING PINS
4 5 6 7
8 9
INDEX PLATE
2-1
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