249 st-relays vde ic drivable pc board relay for field load switching mm inch 11.3 .445 14 .551 31 1.220 features ? sealed to meet the combination pro- cess of automatic wave soldering and cleaning needs ? latching types available ? high switching capacity and high sensitivity in subminiature size 150 mw pick-up, 8 a inrush capacity: 51 a for 1a1b, 35 a for 2a ? high shock and vibration resistance shock: 20 g, vibration: 10 to 55 hz at double amplitude of 2 mm specifications contacts coil (polarized) (at 25 c 77 f ) remarks * speci?cations will vary with foreign standards certi?cation ratings. * 1 measurement at same location as "initial breakdown voltage" section * 2 detection current: 10 ma * 3 wave is standard shock voltage of 1.2 50 m s according to jec-212-1981 * 4 excluding contact bounce time * 5 half-wave pulse of sine wave: 11ms; detection time: 10 m s * 6 half-wave pulse of sine wave: 6ms * 7 detection time: 10 m s * 8 refer to 5. conditions for operation, transport and storage mentioned in ambient environment (page 61). characteristics (at 25 c 77 f 50% relative humidity) arrangement 1 form a 1 form b 2 form a contact material gold ?ash over silver alloy initial contact resistance, max. 30 m w rating (resistive) max. switching power 2,000 va, 150 w max. switching voltage 380 v ac, 30 v dc max. switching current 8 a hp rating 1/4 hp 125, 250 v ac inrush current capability 51 a (tv-3 equivalence) for 1a1b 35 a (tv-1 equivalence) for 2a expected life (min. operations) mechanical (at 180 cpm) 10 7 electrical 8 a 250 v ac (resistive) 10 5 5 a 30 v dc (resistive) 2 10 5 3 a 100 v ac (lamp) 3 10 4 1 a 100 v ac (lamp) 3 10 4 single side stable nominal operating power approx. 240 mw latching nominal set and reset power approx. 240 mw max. operating speed 20 cpm (at rated load) initial insulation resistance* 1 1,000 m w (at 500 v dc) initial breakdown voltage* 2 between contact sets 2,000 vrms between open contacts 1,200 vrms between contacts and coil 3,750 vrms surge voltage between coil and contact* 3 min. 6,000 v operate time* 4 (at nominal voltage) max. 15 ms (approx. 10 ms) release time (without diode)* 4 (at nominal voltage) max. 10 ms (approx. 8 ms) set time* 4 (latching) (at nominal voltage) max. 10 ms (approx. 8 ms) reset time* 4 (latching) (at nominal voltage) max. 10 ms (approx. 8 ms) temperature rise (at 60 c) max. 55 c with nominal coil voltage and at 8 a switching current shock resistance functional* 5 min. 196 m/s 2 {20 g} destructive* 6 min. 980 m/s 2 {100 g} vibration resistance functional* 7 117.6 m/s 2 {12 g}, 10 to 55 hz at double amplitude of 2 mm destructive 176.4 m/s 2 {18 g}, 10 to 55 hz at double amplitude of 3 mm conditions for operation, transport and storage* 8 (not freezing and condens- ing at low temperature) ambient temp. C40 c to +60 c C40 fto +140 f humidity 5 to 85% r.h. unit weight approx. 10g . 353 oz typical applications sequence controllers, facsimiles, telephone controls, remote control security devices and security equipment. ordering information ex. st contact arrangement 1: 1 form a 1 form b 2: 2 form a nil: single side stable l2: 2 coil latching dc 3, 5, 6, 9, 12, 24, 48 v operating function coil voltage 1 l2 dc48v (note) standard packing: carton; 50 pcs., case; 500 pcs.
st 250 types and coil data (at 20 c 68 f ) single side stable 2 coil latching part no. nominal voltage, v dc pick-up voltage, v dc (max.) drop-out voltage, v dc (min.) maximum allowable voltage, v dc (60 c 140f ) coil resistance, w ( 10%) nominal operating current, ma 1 form a 1 form b 2 form a st1-dc3v st2-dc3v 3 2.4 0.3 4.5 38 75 st1-dc5v st2-dc5v 5 4.0 0.5 7.5 105 47 st1-dc6v st2-dc6v 6 4.8 0.6 9.0 150 40 st1-dc9v st2-dc9v 9 7.2 0.9 13.5 360 25 ST1-DC12V st2-dc12v 12 9.6 1.2 18.0 600 20 st1-dc24v st2-dc24v 24 19.2 2.4 36.0 2,400 10 st1-dc48v st2-dc48v 48 38.4 4.8 72.0 9,000 4.7 part no. nominal voltage, v dc set and reset voltage, v dc (max.) maximum allowable voltage, v dc (60 c 140f ) coil resistance, w ( 10%) nominal operating current, ma 1 form a 1 form b 2 form a st1-l2-dc3v st2-l2-dc3v 3 2.4 4.5 40 75 st1-l2-dc5v st2-l2-dc5v 5 4.0 7.5 110 47 st1-l2-dc6v st2-l2-dc6v 6 4.8 9.0 155 37.5 st1-l2-dc9v st2-l2-dc9v 9 7.2 13.5 360 25 st1-l2-dc12v st2-l2-dc12v 12 9.6 18.0 640 18.8 st1-l2-dc24v st2-l2-dc24v 24 19.2 36.0 2,400 9.8 st1-l2-dc48v st2-l2-dc48v 48 38.4 72.0 10,200 4.7 dimensions mm inch general tolerance: 0.2 .008 31.0 1.220 11.0 .433 7.62 .300 7.62 .300 10.16 .400 85 4 3 2 1 76 10.16 .400 14 .551 0.3 .012 3.5 .138 pc board pattern (copper-side view) tolerance: 0.1 .004 2 coil latching types only. 8-dia. 1.4 .055 2.54 .100 2.54 .100 schematic (bottom view) single side stable 1a1b 2a (deenergized condition) 14 5 6 7 8 ? 14 5 6 7 8 ? 2 coil latching 1a1b 12 5 6 7 8 ? 34 + (reset condition) diagram shows the "reset" po- sition when terminals 3 and 4 are energized. energize termi- nals 1 and 2 to transfer con- tacts. 2a 12 ? 34 + 5 6 7 8 diagram shows the "reset" po- sition when terminals 3 and 4 are energized. energize termi- nals 1 and 2 to transfer con- tacts. reference data 1. max. switching power 2. life curve 3. coil temperature rise sample: st1-dc24v 10 20 50 100 200 300 0.1 0.2 0.5 1 2 5 10 voltage, v current, a ac resistive load dc resistive load inductive load ac (cos j =0.4 ) 10 20 50 100 200 500 1,000 12345678910 current, a life, 10 k operations ac 250 v, 125 v resistive load ac 250 v, 125 v inductive load (pf = 0.4) 0.1 0.2 0.3 0.4 0.5 60 50 40 30 20 10 0 temperature rise, c coil operating power, w 5 a 0 a contact current 8 a
st 251 4. in?uence of adjacent mounting sample: st1-dc24v 5. max. ambient temperature by operating power 6. contact reliability (1) (2) (3) (1) & (3) relays are energized. rated of change, % inter-relay distance, mm 5 101520 ?0 ?0 0 10 20 drop-out pick-up 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 10 20 30 40 50 60 70 80 90 100 110 120 max. temperature, c operating power, mw no load 8 a carrying 250 v ac 0.1 0.2 0.3 0.5 0.7 0.9 0.4 0.6 0.8 1.0 2.0 3.0 5.07.0 9.0 10 a m = 3.9 h = 16.8 10 4 r 0.95 = 7.7 10 4 8 a m = 3.5 h = 3.3 10 5 r 0.95 = 1.4 10 5 no. of operations, 10 5 0.1 0.15 0.3 0.4 0.5 1.0 0.2 2.0 3.0 4.0 5.0 1.5 10.0 15.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 95.0 99.0 99.8 99.9 25.0 (%) st-relay 250 v ac cos j = 1.0 0.33 hz . . st relay socket st-ss solder terminal socket st-ps pc board terminal socket speci?cations breakdown voltage 4,000 vrms coil/contacts 2,000 vrms contacts/contacts insulation resistance more than 1,000 m w between terminals heat resistance 150 c ( 302 f ) for 1 hr max. continuous current 10 a relay insertion life 15 times dimensions mm inch st-ps st-ss 31.6 1.244 35.4 1.394 16.6 .654 8 1 7 2 6 3 5 4 14.6 .575 16.4 .646 10.16 .400 1.05 .041 0.3 .012 5.5 .217 4 .158 4.3 .169 0.27 .011 10.16 .400 7.62 .300 7.62 .300 31.6 1.244 35.4 1.394 16.6 .654 8 1 7 2 6 3 5 4 14.6 .575 16.4 .646 10.16 .400 2.3 .090 0.3 .012 5.5 .217 4 .158 5.3 .209 0.27 .011 10.16 .400 7.62 .300 7.62 .300 precautions for use (socket) 1. pc board mounting method pc board pattern the terminal con?guration is symmetrical on the left and right, so an arrow mark ; is stamped on the socket to prevent mis- insertion. we recommend printing the same arrow mark ; on the component mounting side (side opposite from pat- tern) of the pc board. in this case, the ter- minal con?guration becomes the terminal nos. noted near the drilling holes. 2. chassis cutout chassis cutting dimensions 2.54 .100 8-1.5 dia. 8-.060 dia. 87 65 12 34 2.54 .100 contact terminal interval coil terminal interval 15.0 0.2 .591 .008 32.5 0.1 1.280 .004 if the chassis hole is punched with a press, set so the release r on the front side (a side). the range for chassis thickness is 0.6 to 2.2 mm . 024 to .087 inch . 3. relay mounting and removal (1) align the directions of the relay and socket. claw for chassis fastening chassis t = 0.6 to 2.2 .024 to .087 press a side relay (2) insert the relay all the way in, so it is secure- ly in place. (3) press the part indicated by a in the b direc- tion, and fasten by placing the hook on the re- lay. (4). when removing the relay, completely re- lease the hooks on both sides and pull the relay out. hinge mechanism relay case cross-section b (fastening complete) (before fastening) a for cautions for use, see relay technical information (page 48 to 76). 9/1/2000 all rights reserved, ? copyright matsushita electric works, ltd. go to online catalog
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