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The following data defines the indexing that has been established for relays covered by
this manual.
a. The index code always consists of four figures (such as 0001, 0002, or 0101)
and is used for both the relay and the indexing plate on the mounting base.
b. The index code for each relay can be determined from the relay part number and
its suffix which is marked on the name plate attached to the front of the relay.
The first two digits of the index code are the last two digits of the part number,
and the second two digits of the index code are the last two digits of the suffix.
The index number thus obtained should agree with the placement of the indexing
pins in the numbered vertical rows on the back of the relay starting with the top
pin and reading down.
c. The index code for each mounting base is determined by the placement of the
holes in the numbered vertical rows of the large white nylon indexing plate which
is affixed to the front of the mounting base. This indexing plate should not be
removed from the mounting base unless it is damaged or the indexing is to be
purposely changed to accommodate a relay of a different part number. Discard
the indexing plate which comes in a bag tied to the handle of all new relays
unless it is needed for replacement of a damaged indexing plate or for
application to a new mounting base.
Never drill new holes in a base indexing plate which will
permit application of relays with different part numbers.
Never change indexing pins on the back of a relay unless it
is being converted to a new part number. Otherwise, a
hazard will be created which may compromise safety circuit
functions.
2.4. RECEPTACLE CONTACT SPRINGS
2.4.1. Old Style Base Only
The mounting base will normally be equipped with the required quantity of J680165
solderless contact springs receptacle (receptacle springs), and will accommodate one
or two #14 or #16 wires. It can, however, be equipped with receptacles for one or two
#10 or #12 wires (3680181), or for one or two #18 or #20 wires (3680179). Make certain
which type of solderless receptacle contact springs accompany the mounting base
before proceeding with their installation.
2.4.2. Improved One Piece Base Only
The one piece mounting base with hardware (N451376-0302) includes a full
complement of receptacle contact springs (receptacle springs), mounting fasteners, and
tags. Standard solderless receptacle contact springs will accommodate one or two #18 -
Copyright 2019
PN-150BE Biased High Efficiency Vital Relay
WARNING
SM 4551L, Rev. 0 1, March 2019
2-2
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