. Le journal technique de Bell System . POINT 600 l 500 ^V y -250 release1 400 M ^ V ^ -200 300 h Wload V W RELA UOPER/ TING NY -160 200 NL et gt; -150 N^ 100 CON (M RLV ^^ TACTS-> ^AKE) 1 ^ BACKTENSION ^--- ^- 1- -50 0 OPERATEDPOSITION 0.01 0.02 0.03 ARMATURE DE VOYAGE POUCES I LEASSITATION Fig. 14 — caractéristiques typiques de charge et de traction d'un relais rapide à 30 contacts. Le relais. L'ampérage maximal requis est déterminé par le point de charge. Cela se produit à une course d'armature de 0.010 pouces et environ 650 grammes. Dans des conditions statiques, t
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. The Bell System technical journal . POINT 600 l 500 ^V y -250 releasing1 400 M ^ V ^ -200 300 h Wload V W RELA UOPER/ TING Ny -160 200 nL > -150 N^ 100 CON (M RLV ^^ TACTS-> ^AKE) 1 ^ BACKTENSION ^-^~-- ^- 1- -50 0 OPERATEDPOSITION 0.01 0.02 0.03 ARMATURE TRAVEL fIN INCHES I RELEASEDPOSITION Fig. 14 — Typical load and pull characteristics of a 30-contact fast relay. the relay. The maximum ampere turns required are determined by thecritical load point. This occurs at 0.010 inch armature travel andabout 650 grams. Under static conditions, therefore, 160 ampere turnswould be required for complete operation. Circuit uses for these relaysdo not include nonoperate, hold, or release requirements. This informa-tion could however be obtained from the pull curves in a similar manner. Operate and Release Speed The new high speed multicontact relay operates two to three times asfast as its predecessor, the flat spring type relay. Operate and release NEW MULTICONTACT RELAY 1127. 120 OHM 275 OHM HIGH SPEED WIRE SPRING RELAY FLAT SPRING RELAY Fig. 15 — Comparison of operate and release times of wire spring versus flatspring multicontact relays. times are shown in Fig. 15. The improved performance of the new relaysis shown by nominal operate and release values, and also by greatlyreduced spread, or difference between minimum and maximum values, as compared with corresponding data for flat spring relays. Minimum operate times of the replacement and existing flat springrelays are comparable. It will be noted however, that operate and re-lease time spreads are much less in the new relay. This generally shouldimprove the operation of existing crossbar circuits as new relays areused for replacements or additions. Contact Performance As speed increases, rela3^s and other switching mechanisms becomemore susceptible to false operation of contacts. It is obvious also thatfaster operation adds to life requirements and therefore exten