Features n Low peak clamping voltage even during n Cable shields are passed through and severe current surges may be either grounded or arc-protected to ground n Ability to repeatedly protect against high n Vibration-resistant screw-type clamp surge currents up to rated limits terminals n Convenient mounting and grounding to any flat surface or to DIN-1 (TS-32) or DIN-3 n Flame-resistant epoxy-filled housing (TS-35) rail 1840 Series Signal and Dataline Protector 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 configurations (such as RS-485), protectors are placed at each node. Related Bourns Protectors For outdoor applications with 1/2-inch NPT ports (such as field-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 field is recommended. Characteristics 25 C Tested per IEC 61000-4-5 (1) Standard Model 1840-05 1840-12 1840-24 Maximum Operating Voltage 6 V 13 V 26 V dc dc dc Maximum Breakdown Voltage (L-L) and (L-G) 8 V 15 V 30 V dc dc dc (1) Systems operating at 18 V or above and experiencing current above 500 mA (including short-term inrush current at start-up) may latch the overcurrent protection feature in blocking mode. This will prevent system operation until the power is removed. 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 C to +60 C Response Time.......................................................................................................................................< 1 sec Wire Size ................................................................................................................................................20 AWG * Custom voltages are available upon request. Please visit www.bourns.com/docs/Product-Datasheets/SMBJ.pdf for custom allowable voltages. Lead-time may be extended for some custom voltages. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. WARNING Cancer and Reproductive Harm The products described herein and this document are subject to specific legal disclaimers as set forth on the last page www.P65Warnings.ca.gov of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.EQPT E2 E3 E1 EQPT E2 E3 E1 EQPT E2 E3 E1 BALANCED OR DIFFERENTIAL INTERFACE, SUCH AS RS-422 TBU DEVICE L1 E1 BLDG. 1 BLDG. 2 SOLID-STATE LOW VOLTAGE P/N 1840 P/N 1840 E2 L2 L2 E2 PROTECTION TBU DEVICE XMTR L2 E2 E3 L3 L3 E3 RCVR GND GND E3 E1 L1 L1 E1 SHIELD SHIELD File No. SHORTING 1800SERS2 LINK 1840 Series Signal and Dataline Protector EQPT. COMMON COMMON COMMON EQPT. COMMON AND/OR GND. GND. GND. AND/OR GND. Typical Connections How To Order 1840 - nn - An UNBALANCED INTERFACE, TWO INDIVIDUAL CIRCUITS, SUCH AS RS-232 Unbalanced Interface, Two Individual Circuits, Such as RS-232 Model No. Designator TBU DEVICE L1 E1 BALANCED OR DIFFERENTIAL INTERFACE, SUCH AS RS-422 GND Voltage BLDG. 1 BLDG. 2 SOLID-STATE 05 = 5 V dc LOW 12 = 12 V VOLTAGE BLDG. 1 BLDG. 2 P/N 1840 P/N 1840 dc XMTR E2 L2 L2 E2 RCVR PROTECTION 24 = 24 V TBU DEVICE dc E3 L3 L3 E3 L2 E2 48.51 P/N 1840GND P/N 1840GND Clamp RCVR E2 L2 L2 E2 E3 E1 L1 L1 E1 XMTR (1.91) 18.80 3.18 SHIELD SHIELD A1 = DIN-1 (0.74) XMTR E3 L3 L3 E3 (0.125) RCVR SHORTING 2.36 GND GND E3/L3 GROUNDING LINK 9.53 A3 = DIN-3 LINK E1 L1 L1 E1 (0.093) (0.375) File No. 83.31 ALIGNMENT PIN 8-32UNF-2A 1800SERS2 EQPT. COMMON COMMON COMMON EQPT. COMMON (3.28) 17.80 AND/OR GND. GND. GND. AND/OR GND. (0.70) EQPT. COMMON COMMON COMMON EQPT. COMMON How To Order (Clamp) LG AND/OR GND. GND. GND. AND/OR GND. CURRENT LOOP, 4-20 mA CONTROL ROOM Add -A1 to base model number for BALANCED OR DIFFERENTIAL INTERFACE, SUCH AS RS-422 Balanced or Differential Interface, Such as RS-422 DIN-1 clamp. XMTR I (Example: 1840-12-A1) UNBALANCED INTERFACE, TWO INDIVIDUAL CIRCUITS, SUCH AS RS-232 BLDG. 1 BLDG. 2 P/N 1840 GND RED E2 L2 RED/WHITE POWER 250 BLACK /WHITE FEED-THRU(E3/L3) BOURNS E3 L3 SUPPLY OHMS 1669 GREEN GND GROUNDING SCREW BLDG. 1P/N 1840 P/N 1840BLDG. 2 MOUNTING/GROUNDING SCREW E2E1 L2L1 L2 E2 BLK XMTR I E3 L3 L3 E3 RCVR 48.51 GND GND P/N 1840 P/N 1840 E1 L1 L1 E1 XMTR RECEIVER E2 L2 L2 E2 RCVR (1.91) 18.80 3.18 File No. BOURNS 1-5 VOLTS (0.74) 28.96 E3 L3 L3 E3 (0.125) 1800SERS2 File No. COMMON PROTECTOR 2.36 GND E3/L3 GROUNDING LINGND K (1.14)9.53 1800SERS3 GND. P/N 1669 RCVR E1 L1 L1 E1 XMTR 45.47 (0.093) (0.375) (1.79) 83.31 EQPT. COMMON COMMON COMMON EQPT. COMMON ALIGNMENT PIN 8-32UNF-2A 49.02 AND/OR GND. GND. GND.(3.28) AND/OR GND. 17.80 (1.93) DIN-3 RAIL (0.70) (TS-35/EN50022) DIN-1 RAIL EQPT. COMMON COMMON COMMON EQPT. COMMON LG (TS-32/EN50035) AND/OR GND. GND. GND. AND/OR GND. UNBALANCED INTERFACE, TWO INDIVIDUAL CIRCUITS, SUCH AS RS-232 Current Loop, 4-20 mA CURRENT LOOP, 4-20 mA Add -A3 to base model number for CONTROL ROOM DIN-3 clamp. BLDG. 1 BLDG. 2 (Example: 1840-12-A3) XMTR FEED-THRU(E3/L3) I P/N 1840 GROUNDING SCREW E2 P/N 1840 L2 RED P/N 1840 XMTR RED/WHITE MOUNTING/GROUNDING SCREW E2 L2 L2 E2 RCVR POWER 250 BOURNS BLACK /WHITE E3 L3 E3 L3 L3 E3 SUPPLY OHMS 1669 GREEN GND GND GND RCVR E1 L1 E1 L1 L1 E1 XMTR BLK I 28.96 (1.14) RECEIVER 45.47 BOURNS 1-5 VOLTS (1.79) File No. COMMON PROTECTOR EQPT. COMMON COMMON COMMON EQPT. COMMON 49.02 P/N 1669 1800SERS3 GND. AND/OR GND. GND. GND. AND/OR GND. (1.93) DIN-3 RAIL DIN-1 RAIL (TS-35/EN50022) (TS-32/EN50035) CURRENT LOOP, 4-20 mA MM CONTROL ROOM DIMENSIONS: Grounding: The 8-32 mounting screw and attached clamp, and hence the DIN-1 (TS-32) (INCHES) or DIN-3 (TS-35) rail, serve as the protector ground. The rail (or 8-32 mounting screw if the XMTR I clamp is not used) should be connected to the facility ground via an AWG 6 or larger copper P/N 1840 E2 L2 RED /WHITE RED wire. This wire should be as short and straight as possible. Single point grounding will provide POWER 250 BOURNS BLACK /WHITE E3 L3 Circuit Diagram SUPPLY OHMS 1669 better protection and will permit the protector to be located a distance from the equipment. GND GREEN E1 L1 BLK TBU DEVICE L1 E1 I RECEIVER SOLID-STATE BOURNS 1-5 VOLTS LOW File No. COMMON PROTECTOR VOLTAGE 1800SERS3 GND. P/N 1669 PROTECTION TBU DEVICE L2 E2 E3 SHIELD SHIELD SHORTING LINK Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. GND 48.51 (1.91) 18.80 3.18 (0.74) (0.125) 2.36 9.53 E3/L3 GROUNDING LINK (0.093) (0.375) 83.31 ALIGNMENT PIN 8-32UNF-2A (3.28) 17.80 (0.70) LG FEED-THRU(E3/L3) GROUNDING SCREW MOUNTING/GROUNDING SCREW 28.96 (1.14) 45.47 (1.79) 49.02 (1.93) DIN-3 RAIL DIN-1 RAIL (TS-35/EN50022) (TS-32/EN50035) ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~ ~~ ~~ ~ ~ ~~ ~~ ~ ~~ LINE L1 L3 L2 LINE L1 L3 L2 - - - + + + LINE LINE LINE L1 L3 L2 EQUIPMENT EQUIPMENT LINE EQUIPMENT