features low peak clamping voltage even during severe current surges ability to repeatedly protect against high surge currents up to rated limits convenient mounting and grounding to any at surface or to din-1 (ts-32) or din-3 (ts-35) rail cable shields are passed through and may be either grounded or arc-protected to ground vibration-resistant screw-type clamp terminals flame-resistant epoxy- lled housing 1840 series ? signal and dataline protector speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. users should verify actual device performance in their speci c applications. the bourns ? 1840 series signal and dataline protectors are designed to protect sensitive electronic circuits and components from damaging surge voltages and currents. their extremely fast response and low clamping voltages make them particularly suitable for the protection of sensi- tive signal and datalines associated with computer, data communication, instrumentation, broadcasting and industrial controls. they may be used directly with eia standard interfaces rs-232, rs-422, rs-423, rs-485 and with 4-20 ma and 50 ma instrumentation loops. the mode l 1840 series signal and dataline protectors are fast, rugged and capable of protecting against fast rising voltage transients as well as the severe current surges associated with lightning discharges, in each case up to rated limits. method of operation the bourns ? 1840 series are heavy-duty, multi-staged protectors. a solid-state 3rd stage protection component intercepts the leading edge of the surge within sub-nanosecond response time. within microseconds, a primary stage 3-electrode common chambered heavy-duty gas dis charge tube capable of handling 20,000 ampere lightning currents operates and crowbars the majority of the surge energy to ground. th e model 1840 also utilizes bourns tbu ? high-speed protector (hsp) technology as a key 2nd stage. any current through the protector exceeding 300 ma will cause the tbu ? hsp to quickly transition into a high impedance state, thus isolating any harmful voltage and/or current from damaging the protected equipment. the gas discharge tube protector remains in the crowbar state until the surge has passed and line voltage s return to safe levels. the tbu ? hsp then automatically restores the line to normal operation by resetting to a low impedance state. there is no need for resetting a breaker or replacing a fuse to address a transient surge event. application protectors are generally placed at each end of a signal, dataline or current loop. in the case of daisy-chain con? gurations (such as rs-485), protectors are placed at each node. related bourns protectors for outdoor applications with 1/2-inch npt ports (such as ? eld-mounted 4-20 ma transmitters), please refer to the bourns ? model 1669 series protector. in this application, the mixed use of a model 1840 series protector at the controller and a model 1669 series protec tor at the ? eld is recommended. characteristics @ 25 ? standard model 1840-05 1840-12 1840-24 maximum breakdown voltage (l-l) and (l-g) 8 v 15 v 30 v surge life 100 amps 10 x 1000 sec ............................................ 300 operations min. 100 amps 10 x 1000 sec ............................................ 300 operations min. 500 amps 10 x 1000 sec ............................................ 50 operations min. 1000 amps 10 x 1000 sec.......................................... 10 operations min. 3 ka, 6 kv / 8 x 20 sec combination wave ................ 100 operations min. 10 ka / 8 x 20 sec ....................................................... 10 operations min. 20 ka / 8 x 20 sec ....................................................... 5 operations min. breakdown voltage............................................................ see table* esd @ 8 kv ...................................................................... 10 operations min. shield arc protection 6 kv / 3 ka ..................................... 5 operations min. capacitance @ 1 mhz ...................................................... l/g: 45 pf, l/l: 35 pf series resistance.............................................................. 12 typical maximum load continuous current .................................. 220 ma dc leakage current at rated l/g voltage ....................... < 10 a blocking current ................................................................ 300 ma; typical 450 ma signal/data attenuation ..................................................... 3 db @ 30 mhz with 50 termination operating temperature ...................................................... -40 oc to +60 oc response time.................................................................. < 1 sec wire size ........................................................................... 20 awg *custom voltages are available upon request. please visit www.bourns.com/data/global/ pdfs/smbj.pdf for custom allowable voltage. lead-time may be extended for some custom voltages. asia-paci c: tel: +886-2 2562-4117 fax: +886-2 2562-4116 emea: tel: +36 88 520 390 fax: +36 88 520 211 the americas: tel: +1-951 781-5500 fax: +1-951 781-5700 www.bourns.com line equipment shield shorting link e3 l1 l2 e1 e2 tbu device tbu device shield solid-state low voltage protection circuit diagram
e3/l3 grounding link gnd eqpt e2 e3 e1 line l1 l3 l2 48.51 (1.91) 18.80 (0.74) 83.31 (3.28) file no. 1800sers3 p/n 1669 protector bourns p/n 1840 blk red xmtr /white /white green black red 1669 bourns + - control room i i supply power ohms 250 1-5 volts receiver e2 e3 e1 l2 l3 l1 gnd common gnd. ~ ~ ~ ~ typical connections unbalanced interface, two individual circuits, such as rs-232 rev. a 02/14 speci? cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. users should verify actual device performance in their speci? c applications. 1840 series ? signal and dataline protector p/n 1840 p/n 1840 ~~ gnd. common and/or gnd. eqpt. common xmtr gnd l1 l3 l2 e1 e3 e2 rcvr rcvr e2 e3 e1 l2 l3 l1 gnd xmtr eqpt. common and/or gnd. common gnd. ~~ bldg. 1 bldg. 2 balanced or differential interface, such as rs-422 p/n 1840 bldg. 2 bldg. 1 rcvr ~ ~~ ~ e2 e3 e1 l2 l3 l1 gnd eqpt. common and/or gnd. common gnd. p/n 1840 gnd. common and/or gnd. eqpt. common xmtr gnd l1 l3 l2 e1 e3 e2 current loop, 4-20 ma grounding: the 8-32 mounting screw and attached clamp, and hence the din-1 (ts-32) or din-3 (ts-35) rail, serve as the protector ground. the rail (or 8-32 mounting screw if the clamp is not used) should be connected to the facility ground via an awg #6 or larger copper wire. this wire should be as short and straight as possible. single point grounding will provide better protection and will permit the protector to be located a distance from the equipment. product dimensions dimensions: mm (inches) pin alignment 8-32unf-2a 9.53 (0.375) 3.18 (0.125) 2.36 (0.093) 17.80 (0.70) lg how to order (clamp) add -a1 to base model number for din-1 clamp. (example: 1840-12-a1) add -a3 to base model number for din-3 clamp. (example: 1840-12-a3) (ts-32/en50035) din-1 rail grounding screw feed-thru(e3/l3) 49.02 (1.93) 28.96 (1.14) (ts-35/en50022) din-3 rail mounting/grounding screw 45.47 (1.79) dimensions: mm (inches) how to order 1840 - nn - an model no. designator voltage 05 = 5 v 12 = 12 v 24 = 24 v clamp a1 = din-1 a3 = din-3
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