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SERIES 24 LOCK-OUT-RELAYS
FEATURES
Typical Contact Deck Arrangement
The blade and terminal configuration enables the use of multiple contacts in the same deck,
and simple stacking procedures enable the fabrication of many independent contacts in one
relay. Specifically, two N/O contacts and two N/C contacts are provided in each deck, and up
to ten decks can be stacked, resulting in a relay with up to forty contacts (twenty N/O and
twenty N/C). For good practice, however, it is suggested that polarized voltages should
not be used on adjacent contacts. This is because of the remote possibility of flashover
during transition between adjacent contacts -- especially at the higher DC ratings, or in
highly inductive circuits. The illustration shows a single deck. For multideck units the second
digit of the terminal number is the same as shown, but the first digit changes to denote the
deck number. As an example, terminal 82 is in the eighth deck, directly under terminal 12 and
is connected to terminal 88 in the trip position.
Basic LOR Deck Layout
11
12
15
16
21
22
25
26
CONTACTS
POS.
13
18
17
14
23
28
27
24
1
2
Contact Charts
The illustration shows decks one and two of a
typical Series 24 LOR and graphically describes
the operation of the contacts.
Target Used with Lock-out Relays
All the Lock-out Relays have a mechanical target as part of the nameplate – BLACK for RESET
and ORANGE for TRIP. This indicates the condition of the LOR. The target resets when the LOR
resets (with the exception of the high-speed trip electric-reset LOR/ER and self-reset LOR/SR
where the memory target is manually reset).
