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Technical content

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 fl 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-fi lled housing

1840 Series – Signal and Dataline Protector

Specifi 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 specifi 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 Model 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 discharge tube capable of handling 20,000 ampere lightning currents operates and crowbars the majority of the surge energy to ground. The 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 voltages 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 confi 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 fi 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 Protector at the fi eld is recommended. Characteristics @ 25 °C Standard Model 1840-05 1840-12 1840-24 Maximum Breakdown Voltage (L-L) and (L-G) 8 V 15 V 30 V Surge Life termination *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-Pacifi 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 TBU® DEVICE TBU® DEVICE SHIELD SOLID-STATE LOW VOLTAGE PROTECTION Circuit Diagram

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 L1GND COMMON GND. ~~~~ Typical Connections Unbalanced Interface, Two Individual Circuits, Such as RS-232 REV. A 02/14 Specifi 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 specifi c applications. GND. COMMON AND/OR GND. EQPT. COMMON XMTRGNDL1 E2 RCVR RCVR L1GND XMTR EQPT. COMMON AND/OR GND. COMMON GND. ~ ~ BLDG. 1 BLDG. 2 Balanced or Differential Interface, Such as RS-422 P/N 1840 BLDG. 2BLDG. 1 RCVR ~~~ ~ E2 L1 GND EQPT. COMMON AND/OR GND. COMMON GND. P/N 1840 GND. COMMON AND/OR GND. EQPT. COMMON XMTR GND L1 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) PINALIGNMENT 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