99 contacts - intr o overview trim trio and sealok contacts selection matrix trim trio and sealok contacts contacts
100 contacts curr ent ratings for multi-contact connectors choice of right connector - contact combination. the choice of a trim trio connector in combination with a trim trio contact is essential and different for any application there is considerable misunderstanding in the field on current carrying capabilities for the various contacts in the trimtrio programme. the intention of this part is to give guidance how to interprete the given current ratings in general and how to calculate them for particular applications. the information given is based upon existing mil specifications such as: mil-c-26482, mil-c-8384, mil-t-7928, mil-w-5086, mil-w-5088, mil-w-16878, etc. and in conjunction with long field practice. curr ent carrying capabilities trim trio contacts are designed to carry a specific current, in accordance with the applicable specification. this specification will be defined by following variables: ?connector size the more contacts in a connector, the less current per contact can be loaded. ?wire size (see table 1) the cross section will determine the internal resistance and temperature rise for a given current. -table 1 gives the current ratings for the various wire sizes commonly used with trim trio contacts. ?current rating (see table 2) the current load for a given application will generate heat. - table 2 gives the maximum current carrying capacity of most of the trim trio contacts, the maximum operating current and the recommended continuous curren t. ?ambient temperature the combination of the connector size, the wire size and the current rating will generate a temperature rise. this temperature rise + a given ambient temperature may not exeed the maximum operating temperature of the connector material (see performance characteristics for each connector family). ? max. current carrying capacity ? max. operating current ? recommended continuous current what do these values mean in practice ? ? max current carrying capacity of a contact is defined by the conducting section of the contact in its smallest area. the listed values are obtained from several tests in laboratories under room conditions (21 c). the contact is considered to be in free air. ? max operating current is the current with which the contacts can be energized during a longer or shorter period, without deteriorating and depending on working conditions. these are dissipated heat, cooling provisions, ambient temperature, insulation material, etc. ? recommended continuous current can be applied for all normal cases and working conditions. the values include a safety margin. however, there are restrictions in the application of the given values. the most important restriction is the used wire, its sectional area, insulation temperature range, as well as wires in bundles. military specifications require that for a cable bundle of 15 conductors or more, the bundle shall not carry more than 20% of the total carrying capacity of the bundle. in smaller bundles, the allowable percentage of total current may be increased as the bundle approaches the single wire condition. this percentage of increase in total current carrying capacity of the bundle is 6% for each conductor less than 15 in a bundle. table 1 - current carrying capabilities per wire size table 2 - current carrying capabilities per contact type awg wire size wire dia. max.curr. max.oper- recomm. mm 2 mm carrying ating curr. cont. curr. amp. amp. amp. 26 0.13 0.40 3 2 1 24 0.20 0.51 4.5 3 2 22 0.32 0.64 9 5 3 20 0.52 0.81 11 7.5 5 18 0.82 1.02 16 10 7.5 16 1.30 1.29 22 13 10 14 2.10 1.63 32 17 13 size pin dia. type max. curr. max. oper- recomm. carying ating curr. cont. curr. amp. amp. amp. rm / rc 22 13 10 machined 16 .062* sm / sc 22 13 10 1.6 mm 2 piece stamped 20 .040* sm-w / sc-w 11 7.5 5 1.0 mm 2 piece stamped
101 contacts from simple calculations, one can see that the closer the bundle approaches the single wire condition, the higher the allowable current per conductor becomes, to even such an extent, that it exceeds the recommended continuous current value. in that case, the recommended continuous value should have preference. in order to make this clear, we will give hereafter some typical examples. ?example 1 cable bundle, 48 conductors awg20 (0.5mm 2 ) used with circular trimtrio connector with insert arrangement 24-48 and machined size 16 contacts rm/rc20. - total operating current capacity of bundle 48 x 7.5 a ( table i) = 360 a - total allowable capacity for bundles of more than 15 wires is 20% = 72 a - when all conductors are energized equally, this gives: 72 : 48 = 1.5 a per conductor when for instance 5 conductors are energized to the recommended continuous current of 5 a (see table 1) resulting in 25 a consumption, the other conductors may not take more than 72 - 25 = 47 a all together, or 1 a per conductor. any other combination can of course also be taken as long as the total capacity of 72 a is not exceeded and the recommended continuous current is respected. remark please note that contacts used are of the size 16 type with maximum operating current of 13 a (table 2). the maximum operating current of the bundle is however restricted to 7.5 a per conductor due to the wire size of awg20 (see table 1). ?example 2 cable bundle, 14 conductors awg22 (0.32 mm 2 ) used with rectangular trim trio connector with insert arrangement for 14 contacts, and machined size 16 contacts rm / rc20. - total operating current capacity of bundle 14 x 5 (table i) = 70 a - total allowable for wire bundle of 15 wires less 1 is 20% + 6% = 26% gives 18.2 a. - all conductors energized equally, gives: 18.2 : 14 = 1.3 a per conductor this value is within the recommended rating of 3 a so that it can be applied. see also remark under example 1. ?example 3 cable bundle, 4 conductors awg16 (1.3mm 2 ) used with circular trim trio connector with insert arrangement 10-4 and stamped 2 piece contacts sm /sc. - total operating current capacity of bundle 4 x 13 a (table i) = 52 a - total allowable for wire bundle of 15 wires less 11 is 20% + 66% = 86% gives 44.7 a. - all conductors energized equally, gives: 44.7 : 4 = 11.2 a per conductor since the recommended continuous current is 10 a, the conductor should not carry more than 10 a individiually. as said before, the recommended ratings are valid for most common wiring systems and under normal working conditions. for extreme conditions, the given values should be lowered. the percentage of current reduction should be investigated from case to case. a rule-of thumb which can be used for such cases is: 4 amp. per mm 2 wire section it gives us for common used wire sizes the values listed in table 3. 26 0.13 0.5 24 0.20 0.8 22 0.32 1.3 20 0.52 2.0 18 0.82 3.3 16 1.30 5.2 14 2.10 8.4 awg wire size recommended mm2 continuous current amp. table 3 - recommended continuous current for extreme working conditions contacts
102 contacts crimping instructions the conductor and insulation crimp section are designed to accommodate wire- conductor and insulation diameters, expressed in awg (american wire gauge) or mm 2 . for each wire gauge, a correct crimp requires a crimp height that offers the highest performance. this performance is defined as the highest tensile strength force. a good conductor crimp can be guaranteed if the tensile stength force is equal or higher as indicated on the graph below. e.g. a conductor of awg20 (0.52 mm 2 ) has a good crimp if the tensile strength is min 84n. the tensile strength force is measured in newtons and is the wire-to-contact connection that will withstand when a straight axial load is applied to the terminated wire. this is however a destructive test and is therefore inappropriate as a 100% inspection method. an alternative method is to measure crimp height. the crimp height is measured at the conductor-crimp section. ? if the dimension is to small , then the conductor is over-crimped and the wire strands could be damaged, which results in a lower tensile strength force. ? if the dimension is to large , then the conductor is under-crimped and the wire strands will not be deformed enough to assure that the crimp will pass the tensile strength test. in both cases, the application tooling? crimp height should be adjusted. in order to have the right tooling? crimp height go and no-go gauges can be obtained and are defined in function of the type of crimp tooling and the wire gauge. for further information consult factory.
103 rm/rc - machined contacts how to or der k k (ge1) (ge1) 23 23 m m 16 16 (k) rm (k) rc contact type: rm: male contact bulk packing rc: female contact bulk packing krm: male contact on plastic carrier strip krc: female contact on plastic carrier strip awg size: 16, 20, 24, 28 size 16: .0625?(1.6mm) diameter contacts design variation: crimp barrel grounding contact: plating indication: see plating table packing quantity: no digit (std) : 50 pcs. bulk packing (rm/rc) : 2000 pcs on reel (krm/krc) 1000 : 1000 pcs bulk packing (rm/rc) size 16 solid machined contacts for trim trio connectors description size 16 rm/rc .0625?(1.6mm) diameter contacts are precision solid machined crimp snap-in pin and sockets for heavy duty top performance requirements. springs on both contacts are made of spring-tempered, heat-treated, beryllium copper. the socket inner spring supplies high contact pressure to ensure low-resistance contact between pin and socket. the socket contact features closed entry to prevent probe damage. crimp barrels have insulation grips for vibration support and are provided with a cable stop and inspection hole. featur es and benefits ? made from high conductive copper alloy with gold or tin over nickel plate finish. ? heat-treated beryllium copper locking springs assure proper locking and alignment of contacts in the housing. ? colour coded for different wire sizes. ? closed entry design on socket contact to prevent probe damage. ? contacts available in bulk packing performance characteristics current rating: 13 amp contact resistance: m 3 m operating voltage: 750 v rms contact retention in body: 110 n min. individual insertion force: 3.5 n max. individual withdrawal force: 0.55 n min. construction contact body: high conductive copper alloy. outer spring: tempered, heat-treated, non-plated beryllium copper. inner spring socket: tempered, heat-treated, plated beryllium copper. plating table k (std) = min. 0.4 gold all over,over nickel j = gold flash all over, over nickel n = min. 0.75 gold all over,over nickel t = 3 - 5 tin all over, over nickel other platings on request connector accommodation any trim trio contact can be used in any contact position in any connector in the trim trio interconnection system. ?ms-m rectangular connectors ?sms qikmate ?pi43 eurorack connectors ?ut-bantam ?utg metalok bantam ?utp full plastic bantam ?utgs shielded bantam ?mbg bantamate ii rm/rc
104 rm/rc - machined contacts standar d rm/rc crimp contacts: contact size 16 - pin diameter 1.57mm (.062? dimensional table part number colour wire size max. max. wire pin contacts fig. socket contacts fig. code awg mm 2 wire insul. strip i.d. o.d dia. dia. length rm28m1k 1 rc28m1k 7 30 - 28 0.05 - 0.08 0.55 1.1 1.50 1.90 rm24m9k 2 rc24m9k 8 red 26 - 24 0.13 - 0.20 0.8 1.7 4.8 1.50 2.55 rm20m13k 3 rc20m13k 9 black 22 - 20 0.32 - 0.52 1.18 1.9 1.83 2.92 rm20m12k 4 rc20m12k 10 blue 22 - 20 0.32 - 0.52 1.18 2.2 1.83 2.92 rm16m23k 5 RC16M23K 11 green 20 - 16 0.52 - 1.50 1.82 3.2 7.1 2.55 rm16m23ge1k 6 rc16m23ge1k 12 green + red 20 - 16 0.52 - 1.50 1.82 3.2 2.55 packing quantity: 50 pcs bulk packing (standard) for 1000 pcs bulk packing add ?000?at the end of the part number e.g. rm16m23k1000 for machined contact reeled on plastic carrier: put ??in front of part number e.g. krm16m23k for other platings: see plating table crimptooling table hand crimp tooling for loose contacts automatic crimp tooling for contacts on strip size hand tools mh860 m10s1 m8nd p100man (press) extraction die set positioner locator die set stop die set left side tools included setting bushing applicator krm/krc (not incl.) (not incl.) (not incl.) (not incl.) (not incl.) 28 4/6 s9 n24rt10 mls228 24 mr8ge5 mh86164g 5/6 sl40 mls224 rx2025ge1 20 and 5/7 s10 n20rt30 mls220 or 16 y16rcm sl39 n16rt21 rx2025ge2 16 mh86186 6/8 s3d1 sl115 n16rt25 mls216 ge1 for detailed information on crimp tooling : see crimp tooling section
105 rm/rc - machined contacts special rm / rc contacts: contact size 16 - pin diameter 1.57mm (.062? part number wire size post cross length out of anti-rotating pin contacts fig. socket contacts fig. code awg mm 2 section trim trio bushing a cavity part number rm16seok 1 rc16se4k 2 handsolder 16 - 20 1.50 - 0.52 ?.7 3.5 - rm20m12g4k 3 rc20m12g4k 4 mini - wrap 28 - 30 0.08 - 0.05 ?0.636 16.0 j1661 rm20m12e8k 7 rc20m12e8k 8 dipsolder - - ?0.9 5.2 - rc20m12e83k 9 dipsolder - - ?0.9 10.4 - rc20m12384k 10 dipsolder - - ?0.9 13.9 - the rm/rc contact principle the rm/rc contact packing 50 pcs bulk packing (standard) 1000 pcs bulk packing reeled contacts on plastic carrier (qty 2000 pcs) rm/rc
106 sm/sc -m stamped contacts how to or der s6 s6 1 1 (l) (l) m m 16 16 sm sc contact type: sm: male contact s c : female contact awg size: 14, 16, 20, 24 type of crimp barrel: american open crimp barrel packing: no digit: contacts on strip (qty 3000 per reel) l: preformed loose piece contacts design variation 1 : only wire crimp for size 14 and 16 : wire + insulation crimp for sizes 20 and 24 11 : wire + insulation crimp for size 16 plating indication: see plating table size 16 stamped and formed contacts for trim trio connectors description size 16 sm/sc .0625?(1.6mm) diameter contacts are two piece strip formed crimp snap-in pin and sockets. these contacts consist of a crimp body made of high conductive copper alloy, and a stainless steel retaining spring featuring retention in the housing cavity and a closed entry socket to prevent probe damage. the contact with its open barrel is standard available on srtip and packaged with 3000 pcs on reel. this reel packaging combined with semi or even full automatic crimp tooling provides the added advantage of a lower installed cost. featur es and benefits ? made from high conductive copper alloy with gold or tin over nickel plate finish. ? two piece construcion with dual purpose spring which serves for contat retention and protects the body against damage. ? contacts available on reel (standard) and in bulk packing (100 pcs). ? suitable for high volumes and lower installation cost. performance characteristics current rating: 13 amp contact resistance: m 6 m operating voltage: 750 v rms contact retention in body: 65 n min. individual insertion force: 3.5 n max. individual withdrawal force: 0.55 n min. construction contact body: high conductive copper alloy. outer spring: stainless steel plating table s6 = 0.75 gold min. in contact area, flash on crimp barrel over nickel. d70 = gold flash all over, over nickel. tk6 = preplated tin all over. connector accommodation any trim trio contact can be used in any contact position in any connector in the trim trio interconnection system. ?ms-m rectangular connectors ?sms qikmate ?pi43 eurorack connectors ?ut-bantam ?utg metalok bantam ?utp full plastic bantam ?utgs shielded bantam ?mbg bantamate ii
107 sm/sc -m stamped contacts standar d sm/sc crimp contacts: contact size 16 - pin diameter 1.57mm (.062? part number: contacts on strip part number: loose pieces mn wire size insulation wire pin contacts fig. socket contacts fig. awg mm 2 diameter strip length sm24m1s6 1 sc24m1s6 2 26 - 24 0.13 - 0.25 0.89 - 1.58 4.0 sm24ml1s6 sc24ml1s6 sm20m1s6 3 sc20m1s6 4 22 - 20 0.35 - 0.50 1.17 - 2.08 4.0 sm20ml1s6 sc20ml1s6 sm16m1s6 5 sc16m1s6 6 18 - 16 0.80 - 1.50 2.0 - 3.0 4.65 sm16ml1s6 sc16ml1s6 sm16m11s6 7 sc16m11s6 8 18 - 16 0.80 - 1.50 3.0 6.35 sm16ml11s6 sc16ml11s6 sm14m1s6 9 sc14m1s6 10 14 2.0 3.0 6.35 sm14ml1s6 sc14ml1s6 dimensional table hand crimp tooling for loose contacts automatic crimp tooling for contacts on strip p100man extraction size tooling hand tools m8nd left side stripper die set included die set applicator unit (not included) (not included) crimptooling table for other platings: see plating table. 24 y16scm2 (ratchet) n24rt11 mls0318b 20 y14scm2 (not ratchet) n20rt29 mls0555a y14mtv (ratchet) 16m(l)11 y16scm2 (ratchet) n16rt26 mls0356a sc10s1 rx2025ge1 y14scm2 (not ratchet) or 16m(l)1 y14scm (ratchet) n16rt24 mls1579 rx2025ge2 y14mtv (ratchet) 14 y14scm (ratchet) n14rt13 mls1047 y14mtv (ratchet) for detailed information on crimp tooling : see crimp tooling section sm/sc-m
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