1740

Features ■ ■ ■ ■ Protects subscribers and equipment from destructive power crosses and lightning surges Compact size fits subscriber network interface devices Reduces frequency of service calls Increases reliability of network operation ■ ■ ■ Reduces cost of network maintenance UL Listed per 497 C Patent # 5,508,873 (U.S.); #2,169,604 (Canada) ® 1740 Series – Coaxial Surge Protector 75 Ohm Powered & Unpowered Coax DC to >1 GHz The Bourns 1740 Series of Primary Broadband Coaxial Surge Protectors is designed for Network and other high frequency applications. The 1740 Series provides protection against surges on 75 ohm coax subscriber drops and has a fail-short mechanism in the event of dangerous power-crosses. The protector will pass bi-directional signals over the bandwidth from DC to in excess of 1 Ghz. Its cast-metal housing and environmentally sealed design will withstand the toughest Outside Plant Applications. Characteristics Min. Band Width/Frequency Characteristics DC to 1.0 GHz DC to 1.25 GHz Connectors, Input & Output ............................................ F-Type (female) .................................. F-Type (female) Characteristic Impedance ............................................... 75 Ω ......................................................... 75 Ω Transmission/Insertion Loss (Max.) ................................ 0.15 dB ............................................... 0.45 dB Return Loss (Max.) ..................................................... 20 dB .................................................. 13 dB VSWR (Max.) ............................................................. 1:1.22 ................................................. 1:1.57 Min Fail-Short, Power Cross & Sustained 60 Hz Current Capability 1000 Vrms Open-Circuit Voltage, 25 °C ..................... 30 Arms Line to Ground ..................... 15 minutes 60 Arms Line to Ground 5 seconds 120 Arms Line to Ground 5 seconds 350 Arms Line to Ground 200 mseconds Capacitance ............................................................... 1 MHz, 1 Vrms, 0 Vdc ........................ 108 Ω Operating Temperature .............................................. -40 °C to 65 ° C (-40 °F to 149 °F) ...... -40 °C to 65 °C (-40 °F to 149 °F) Storage Temperature .................................................. -55 °C to 85 ° C (-67 °F to 185 °F) ...... -55 °C to 85 °C (-67 °F to 185 °F) SURGE PROTECTION CHARACTERISTICS Model No. DC Breakdown @ 100 V/Sec (Volts) Typical Impulse Breakdown @ 100 V/ µs (Volts) Service Life, Lightning Service Life, AC, 60 Hz 100 A 5 kA 20 kA 5A 10 A 10/1000 µs 8/20 µs 8/20 µs 1000 Vac 1 sec 1000 Vac 1 sec (Operations) (Operations) (Operations) (Operations) (Operations) IMPULSE RESET 52.5Vdc @ 260 mA 135 Vdc @ 200 mA (Millisec) 1740-15 1740-23 1740-35 150 ±20 % 230 ±20 % 350 ±20 % 350 450 650 >1000 >1000 >1000 >10 >10 >10 >1 >1 >1 20 20 20 10 10 10