https://www.phoenixcontact.com/us/products/2749987 Surge protection device - BXT-M/RS485-TTL - 2749987 Please be informed that the data shown in this PDF Document is generated from our Online Catalog. Please find the complete data in the user's documentation. Our General Terms of Use for Downloads are valid (http://phoenixcontact.com/download) Surface-mounted housing with surge protection, for RS-485 interface with with TTL level, mains connection with slot for protective plug PRT-S... (without protective plug) Key commercial data Packing unit 1 pc GTIN Weight per Piece (excluding packing) 312.0 GRM Custom tariff number 85363010 Country of origin Germany Technical data Dimensions Height 50 mm Width 100 mm Depth 100 mm Ambient conditions Ambient temperature (operation) -40 C ... 75 C Degree of protection IP54 General Color gray Standards for air and creepage distances IEC 60664-1 IEC 61643-1 Mounting type Surface/Wall mounting Type Housing for surface mounting 09/08/2014 Page 1 / 6 https://www.phoenixcontact.com/us/products/2749987 Surge protection device - BXT-M/RS485-TTL - 2749987 Technical data General Direction of action Line-Line & Line-Signal Ground/Shield & Signal Ground/Shield-Earth Ground Protective circuit IEC test classification B2 C1 C2 C3 D1 Maximum continuous operating voltage UC 6.2 V DC Maximum continuous voltage UC (wire-wire) 6.2 V DC Maximum continuous voltage UC (wire-ground) 6.2 V DC Nominal current IN 1.5 A (25 C) Operating effective current IC at UC 1 A Residual current IPE 5 A Nominal discharge current In (8/20) s (Core-Core) 350 A Nominal discharge current In (8/20) s (Core-Earth) 5 kA Nominal discharge current In (8/20) s (Core-GND) 350 A Total surge current (8/20) s 5 kA Max. discharge current Imax (8/20) s maximum (Core-Core) 350 A Max. discharge current Imax (8/20) s maximum (Core-Earth) 5 kA Max. discharge current Imax (8/20) s maximum (Core-GND) 350 A Output voltage limitation at 1 kV/s (Core-Core) spike 45 V Output voltage limitation at 1 kV/s (Core-Earth) spike 450 V Output voltage limitation at 1 kV/s (Core-Core) static 16 V Output voltage limitation at 1 kV/s (Core-Earth) static 450 V Voltage protection level UP (Core-Core) 35 V (C1, 500 V/250 A) 50 V (C1, 700 V/350 A) 22 V (C3 - 100 A) Voltage protection level UP (Core-Earth) 550 V (B2 - 4 kV/100 A) 550 V (C2, 4 kV/2 kA) 600 V (C2, 10 kV/5 kA) 700 V (C3 - 100 A) Response time tA (Core-Core) 500 ns Response time tA (Core-Earth) 100 ns Input attenuation aE, sym. typ. 0.1 dB ( 10 MHz/50 ) typ. 0.1 dB ( 4 MHz / 150 ) 09/08/2014 Page 2 / 6 https://www.phoenixcontact.com/us/products/2749987 Surge protection device - BXT-M/RS485-TTL - 2749987 Technical data Protective circuit typ. 0.1 dB ( 1 MHz/600 ) Cut-off frequency fg (3 dB), sym. in 50 Ohm system typ. 100 MHz Cut-off frequency fg (3 dB), sym. in 150 Ohm system typ. 100 MHz Cut-off frequency fg (3 dB), sym. in 600 Ohm system typ. 10 MHz Capacity (Core-Core) typ. 20 pF Capacity (Core-Earth) typ. 10 pF Surge carrying capacity in acc. with IEC 61643-21 (Core-Core) B2 (4 kV / 100 A) C1 (350 A) C3 - 100 A Surge carrying capacity in acc. with IEC 61643-21 (Core-Earth) B2 (4 kV / 100 A) C2 - 10 kV / 5 kA C3 - 100 A D1 - 2,5 kA Connection data Connection method Screw terminal blocks Connection type IN Screw terminal blocks Connection type OUT Screw terminal blocks Conductor cross section stranded min. 0.14 mm Conductor cross section stranded max. 1 mm Conductor cross section solid min. 0.14 mm Conductor cross section solid max. 1.5 mm Conductor cross section AWG/kcmil min. 26 Conductor cross section AWG/kcmil max 16 Standards and Regulations Standards/regulations IEC 61643-21 Classifications eCl@ss eCl@ss 4.0 27140201 eCl@ss 4.1 27130801 eCl@ss 5.0 27130801 eCl@ss 5.1 27130801 eCl@ss 6.0 27130810 eCl@ss 7.0 27130810 eCl@ss 8.0 27130810 09/08/2014 Page 3 / 6 https://www.phoenixcontact.com/us/products/2749987 Surge protection device - BXT-M/RS485-TTL - 2749987 Classifications ETIM ETIM 2.0 EC001473 ETIM 3.0 EC001473 ETIM 4.0 EC000943 ETIM 5.0 EC000943 UNSPSC UNSPSC 6.01 30212010 UNSPSC 7.0901 39121610 UNSPSC 11 39121610 UNSPSC 12.01 39121610 UNSPSC 13.2 39121620 Approvals Approvals Approvals GOST Ex Approvals Approvals submitted Approval details GOST Drawings 09/08/2014 Page 4 / 6 https://www.phoenixcontact.com/us/products/2749987 Surge protection device - BXT-M/RS485-TTL - 2749987 Dimensioned drawing Circuit diagram T(A) T(A) T(B) T(B) R(A) R(A) J 100 L 100 PE OUT IN R(B) R(B) GND GND N FM J 49 1 = signaling 2 = optional Diagram Characteristic attenuation curve 09/08/2014 Page 5 / 6 https://www.phoenixcontact.com/us/products/2749987 Phoenix Contact 2014 (c) - all rights reserved http://www.phoenixcontact.com 09/08/2014 Page 6 / 6