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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).