349 www.littelfuse.com 8 gas discharge tubes gas discharge tubes heavy duty delta range 3 electrode gdt a=tip b=ring e=ground (centre electrode) graphical symbol ordering information a b e 1026 ? voltage sl all dimensions in mm greentube sl1026 series gas plasma arresters the sl1026 series is a heavy-duty transient suppresser using gas plasma technology. in response to a transient voltage which exceeds the fixed breakover voltage (selected according to part number) the device changes from a very high impedance state to a low impedance state, there by conducting harmful current away from the protected system. the design is optimized for the protection of electrical and electronic equipment employed in railway systems: carefully designed geometry ensures the device does not become a short circuit in the event of a failure due to conditions and events beyond the design criteria. an electrical mounting clip (pn sl1053 ) is available to aid mounting and con- nection. a mounting plate (pn sl 1056) is also available which accepts 10 sl1053 s. mounting of the clips to the plate provides a common ground connection; the plate can then be connected to a suitable ground via the screw terminal. features ? rohs compliant ? 55 ka surge capability (single shot) tested with 8/20 s pulse as defined by iec 61000-4-5 ? 40 ka surge capability (repetitive) ? will protect against trapezoidal waveforms as specified in ria 12. ? will protect against capacitor discharge voltage transient waveforms as specified in ria 12. will protect against double exponential voltage transient waveforms as specified in iec 571. applications: ? signaling equipment. ? communication equipment ? control gear. ? trackside cabinets. cell phone base stations mechanical specifications: weight: 11g (0.388 oz.) materials: electrode base: nickel iron alloy electrode plating: bright sn body: ceramic device marking: color coded body sl1026a275: black/black sl1026a400: black/yellow sl1026a700: black/red type 1053 holder pb rohs
350 www.littelfuse.com gas discharge tubes littelfuse maximum duty 3 terminal arrester totally non-radioactive, ul recognized (1) at delivery aql 0.65 level ii, din iso 2859 (2) in ionized mode (3) tested according to itu-t rec.k.12 (4) either end electrode to center electrode (5) total current through center electrode, both line electrodes connected together (6) 100 amps, 10/1000 s pulse, as per itu k 12 (7) 10 shots, a.c. 50hz, 1 sec. duration. (9) 10 shots, 8/20 s waveform (10) measured @ 100 volts greentube sl1026 series gas plasma arresters heavy duty delta range part number SL1026-275 sl1026-400 sl1026-700 sl1026-1100 dc voltage 275 400 700 1100 dc breakover voltage (vbr) 200-350 300-500 560-840 880-1320 max dynamic breakover voltage @ 1kv/us (vbr) 800 900 1000 1700 max repetitive impulse discharge current (4)(9) (a) 40,000 40,000 40,000 40,000 max single impulse discharge current (4)(9) (a) 55,000 55,000 55,000 55,000 max single impulse discharge current (1)(4) (a) 10,000 10,000 10,000 10,000 max ac current (4)(7) (a) 40 40 40 40 max ac current, 9 cycles 50hz (4) (a) 200 200 200 200 insulation resistance (10) (ohms) 1x10 8 1x10 8 1x10 8 1x10 8 max capacitance (4) (pf) 2.5 2.5 2.5 2.5 holdover voltage (3) (v) 130 130 130 130 nominal on-state voltage @ 1a (v) 20 20 20 20 voltage (v) time (ns) 0 200 400 600 800 1000 1200 max dynamic breakover voltage hold-over voltage on-state voltage voltage vs time characteristic pb rohs
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