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engineering data sheet series 144 railway relay 2 pdt for inrush current, 4 amp application notes: 001 007 009 applicable socket for socket selection, please contact factory hrcw non polarized, non latching, hermetically sealed relay contact arrangement 2 pdt coil supply direct current principle technical characteristics contacts rated at 28 vdc / 4 amps rated for capacitive and lamp loads weight < 11 grams dimensions of can without hardware 20.6mm x 10.4mm x 10.5mm max tin plated, hermetically sealed metal can. contact electrical characteristics minimum operating cycles contact rating per pole and load type load current in amps @28 vdc @115 vac/60-400hz 100,000 cycles 100,000 cycles 500,000 cycles resistive load inductive load (l/r=5ms) low level (30 a/30 mv) 4 2 - 0.3 - - 100,000 cycles 100,000 cycles on capacitive load at 28 to 72vdc on lamp load at 28 to 72vdc inrush = 8 amps / 1ms 0.8 life expectancy for dc loads other than 28vdc: see application note n009 featuring leach ? power and control solutions www.esterline.com americas 6900 orangethorpe ave. p.o. box 5032 buena park, ca 90622 . . tel: (01) 714-736-7599 fax: (01) 714-670-1145 europe 2 rue goethe 57430 sarralbe france . . tel: (33) 3 87 97 31 01 fax: (33) 3 87 97 96 86 asia units 602-603 6/f lakeside 1 no.8 science park west avenue phase two, hong kong science park pak shek kok, tai po, n.t. hong kong tel: (852) 2 191 3830 fax: (852) 2 389 5803 data sheets are for initial product selection and comparison. contact esterline power systems prior to choosing a component. date of issue: 4/06 - 1 - page 1 of 4
coil characteristics (vdc) series 144 code 06 12 24 36 48 72 nominal operating voltage 6 12 24 36 48 72 maximum operating voltage 7.5 15 33 45 60 90 minimum operating voltage at +70, coil previously energized at 1.15 un 5 10 22 25.2 33.6 50.4 minimum operating voltage at +70, coil non previously energized 4.4 8.8 19.3 22.1 29.5 44.3 hold voltage at +85c 2.5 5 12 15 20 30 drop-out voltage at -25c 0.4 0.8 1.5 2.4 3.2 4.8 coil resistance in ohms 10% at +25c 47.5 190 935 1600 2600 4400 general characteristics operating temperature -25c to +70c storage temperature -40c to +85c dielectric strength at sea level, all points 500 vrms / 50 hz initial insulation resistance at 100 vdc >1000 m w sinusoidal vibration 30 g / 70 to 3000 hz shock 100 g / 11 ms maximum contact opening time under vibration and shock 10 s operate time at nominal voltage (including bounce) 5 ms max release time 5 ms max bounce time 2 ms max contact resistance at 0.5 amp load current 30 mw max date of issue: 4/06 - 2 - page 2 of 4
mounting styles series 144 dimensions in mm tolerances unless otherwise specified 0.25mm schematic diagram terminal types numbering system 144 f d c 24 basic series designation__________________________| | | | | 1-terminal types(f,s)_________________________________| | | | 2-mounting styles (c,r,e,p)___________________________________| | 3-coil voltage (06,12,24,36,48,72)_________________________________| d a t e o f i s s u e : 4 / 0 6 - 3 - p a g e 3 o f 4 ? 3 . 1 0 . 7 0 . 7 3 . 2 2 0 . 6 m a x c 1 0 . 4 m a x c o n t r a s t i n g b e a d 1 0 . 5 m a x 2 7 2 7 . 4 3 2 . 5 m a x r 0 . 3 8 m a x 3 2 . 5 m a x 2 7 2 7 . 4 e 0 . 4 6 8 m a x 3 . 1 8 m a x 3 . 1 2 7 3 2 . 5 m a x 0 . 4 p 6 0 . 4 1 1 . 6 m a x x 2 b 2 b 3 x 1 b 1 a 2 a 1 a 3 b o t t o m v i e w , d e - e n e r g i z e d c o i l + 0 . 3 - 0 . 4 t i n p l a t e d p i n s ? 0 . 8 c o n t r a s t i n g b e a d 5 . 0 8 + 0 . 3 - 0 . 4 4 . 8 f 5 . 0 8 4 . 8 + 0 . 0 3 - 0 . 0 5 s o l d e r h o o k s ? 1 . 5 + 0 . 0 3 - 0 . 0 5 ? 0 . 8 s c o n t r a s t i n g b e a d
notes series 144 1. for socket selection, please contact factory. 2. isolation spacer pads for pcb mounting available on request. 3. ultra sonic cleaning may adversly affect the normally closed contacts. typical characteristics l coil resistance temperature change: see application note n001 l coil l/r ratio for all types of dc coils is = 1.5 ms date of issue: 4/06 - 4 - page 4 of 4
application notes n001 correction due to coil copper wire resistance change in temperature example: coil resistance at 25c: 935 ohms. what is it at 125c? correction coefficient on diagram is: 1.39 at 125c. r becomes: 935x1.39=1299 ohms correction also applies to operating voltages date of issue: 6/00 - 1 - page 1 of 1
application notes n007 suppressor devices for relay coils the inductive nature of relay coils allows them to create magnetic forces which are converted to mechanical movements to operate contact systems. when voltage is applied to a coil, the resulting current generates a magnetic flux, creating mechanical work. upon deenergizing the coil, the collapasing magnetic field induces a reverse voltage (also known as back emf) which tends to maintain current flow in the coil. the induced voltage level mainly depends on the duration of the deenergization. the faster the switch-off, the higher the induced voltage. all coil suppression networks are based on a reduction of speed of current decay. this reduction may also slow down the opening of contacts, adversly effecting contact life and reliability. therefore, it is very important to have a clear understanding of these phenomena when designing a coil suppression circuitry. typical coil characteristics on the graph below, the upper record shows the contacts state. (high level no contacts closed, low level nc contacts closed, intermediate state contact transfer). the lower record shows the voltage across the coil when the current is switched off by another relay contact. the surge voltage is limited to -300v by the arc generated across contact poles. discharge duration is about 200 mircoseconds after which the current change does not generate sufficient voltage. the voltage decreases to the point where the contacts start to move, at this time, the voltage increases due to the energy contained in the no contact springs. the voltage decreases again during transfer, and increases once more when the magnetic circuit is closed on permanent magnet. operating times are as follows: time to start the movement 1.5ms total motion time 2.3ms transfer time 1.4ms contact state date of issue: 6/00 - 8 - page 1 of 4
types of suppressors: passive devices. the resistor capacitor circuit it eliminates the power dissipation problem, as well as fast voltage rises. with a proper match between coil and resistor, approximate capacitance value can be calculated from: c = 0.02xt/r, where t = operating time in milliseconds r = coil resistance in kiloohms c = capacitance in microfarads the series resistor must be between 0.5 and 1 times the coil resistance. special consideration must be taken for the capacitor inrush current in the case of a low resistance coil. the record shown opposite is performed on the same relay as above. the operation time becomes: - time to start the movement 2.3ms - transfer time 1.2ms the major difficulty comes from the capacitor volume. in our example of a relay with a 290 w coil and time delay of 8 ms, a capacitance value of c=0.5 uf is found. this non polarized capacitor, with a voltage of 63v minimum, has a volume of about 1cm 3 . for 150v, this volume becomes 1.5 cm 3 . date of issue: 6/00 - 9 - page 2 of 4
the bifilar coil the principle is to wind on the magnetic circuit of the main coil a second coil shorted on itself. by a proper adaptation of the internal resistance of this second coil it is possible to find an acceptable equilibrium between surge voltage and reduction of the opening speed. to be efficient at fast voltage changes, the coupling of two coils must be perfect. this implies embedded windings. the volume occupied by the second coil reduces the efficiency of the main coil and results in higher coil power consumption. this method cannot be applied efficiently to products not specifically designed for this purpose. the resistor (parallel with the coil) for efficient action, the resistor must be of the same order of magnitude as the coil resistance. a resistor 1.5 times the coil resistance will limit the surge to 1.5 times the supply voltage. release time and opening speed are moderately affected. the major problem is the extra power dissipated. semi-conductor devices the diode it is the most simple method to totally suppress the surge voltage. it has the major disadvantage of the higher reduction of contact opening speed. this is due to the total recycling, through the diode, of the energy contained in the coil itself. the following measurement is performed once again on the same relay. operation times are given by the upper curve: - time to start the movement 14ms - transfer time 5ms these times are multiplied by a coefficient from 4 to 8. the lower curve shows the coil current. the increase prior to no contact opening indicates that the contact spring dissipates its energy. at the opening time the current becomes constant as a result of practically zero opening speed. due to this kind of behavior, this type of suppression must be avoided for power relays. for small relays which have to switch low currents of less than 0.2 a, degradation of life is not that significant and the method may be acceptable. date of issue: 6/00 - 10 - page 3 of 4
the diode + resistor network it eliminates the inconvenience of the resistor alone, explained above, and it limits the action of a single diode. it is now preferred to used the diode + zener network. the diode + zener network like the resistor, the zener allows a faster decurrent decay. in addition it introduces a threshold level for current conduction which avoids the recycling of energy released during contact movement. the lower curve on the opposite record demonstrates those characteristics. voltage limitation occurs at 42v. the two voltages spikes generated by internal movement are at lower levels than zener conduction. as a result, no current is recycled in the coil. the opening time phases are as follows: - time to start the movement 2.6ms - total motion time 2.4ms - transfer time 1.4ms the release time is slightly increased. the contacts' opening speed remains unchanged. date of issue: 6/00 - 11 - page 4 of 4
application notes n009 life capability versus voltage relay series 144 to define life at values of l/r different to 30 ms, it is possible to consider the product n cycles x l/r = constant. this for a given current and voltage. for example if a 80 v l/r 30ms 0.25 a, life is found on the graph at 100,000 cycles. for a l/r of 10 ms, and the same current, 0.25 a, life should be 100,000 x 30 / 10 = 300,000 cycles. date of issue: 6/00 - 13 - page 1 of 1
engineering data sheet hrcw relay socket 2 amp basic socket series designation for: series f250, f257, w260, gp5, and 144 meets the requirements of: mil-s-12883 dimensions general characteristics supplied with mounting hardware. temperature range -65c to +125c weight 10 grams dielectric strength at sea level 1500 vrms / 50 hz minimum gold plated contact per mil-g-45204 dallyl phthalate, glass-fiber filled per mil-m-14 featuring leach ? power and control solutions www.esterline.com americas 6900 orangethorpe ave. p.o. box 5032 buena park, ca 90622 . . tel: (01) 714-736-7599 fax: (01) 714-670-1145 europe 2 rue goethe 57430 sarralbe france . . tel: (33) 3 87 97 31 01 fax: (33) 3 87 97 96 86 asia units 602-603 6/f lakeside 1 no.8 science park west avenue phase two, hong kong science park pak shek kok, tai po, n.t. hong kong tel: (852) 2 191 3830 fax: (852) 2 389 5803 data sheets are for initial product selection and comparison. contact esterline power systems prior to choosing a component. date of issue: 9/09 - 4 - page 1 of 1

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