Features UL14494thEdition Hybridprotectiontechnology Extremelylowleakagecurrent RoHScompliant* Heavydutysurgeprotection LEDindicatorsandaudiblealarm Compactformfactor Indoororoutdoorinstallation 1251 Series Hardwired AC Hybrid Surge Protective Device (H-SPD) General Information The Bourns Model 1251 Series is a Type 1 hardwired hybrid surge protective device targeted for AC infrastructure applications. The hybrid Model 1251 design combines fast responding MOV technology with low leakage GDT technology resulting in reliable and long term performance. Electrical Characteristics Model No. Characteristic 1251-120S 1251-208Y 1251-240S 120 VAC 120 / 208 VAC 120 / 240 VAC Electrical Distribution System Single Ph 3 Ph Wye Single Ph Nominal (Operating) Voltage 120 VAC 120 / 208 VAC 120 / 240 VAC Maximum Operating Voltage MCOV 150 VAC Temporary Overvoltage Withstand U 150 VAC T Nominal Discharge Current in 15 I 20 kA n Applications of 8/20 s Impulse Waveform Maximum Discharge Current I 50 kA max 8/20 s Withstand Single Operation Overvoltage Protection Rating (3 kA) V 700 VAC pr Protection Level at In U -I 1200 VAC p n Short Circuit Current Rating I 100 kA sccr Disconnection Features / Options How To Order 1251 - xxxx - xx Thermal Disconnect................................................................................................ Internal Series Fuses or Circuit Breakers............................................................................................ 40 A Nominal (Operating) Voltage Ground Fault Breaker (if Installed) ............................................................Type S or Delay 120S = 120 VAC 208Y = 120/208 VAC Mechanical Characteristics 240S = 120/240 VAC Configuration Enclosure............................................................................................................ Aluminum N1= Wiring/Nipple Right Side Exit Environmental Rating ...............................................................................IP 66 / NEMA 4x N2 =Wiring/Nipple Rear Exit Operating Temperature.............................................................................-40 C to +85 C Mounting......................................................................................................Bulkhead (3/4) Packaging Specifications Weight .....................................................................................................................2.5 lbs. Disconnection Indicator ........................................................LED off and audible alarm on 1251 Series ...................one unit per box Electrical Connection....................................12 AWG wiring leads, 20 inches max. length Mechanical Connection to Panel.......................12 gauge, straight nipple with conduit nut for mounting through 0.5 inch knockout (actual hole size 0.875 inch) Standards Compliance UL1449 4th Edition, Type 1 ................................................................................. E313168 CEI 61643-1, International...............................................Low Voltage SPD - Test Class II EN 61643-11, Europe......................................................Low Voltage SPD - Test Class II *RoHS Directive 2015/863, Mar 31, 2015 and Annex. Specications are subject to change without notice. Users should verify actual device performance in their specic applications. The products described herein and this document are subject to specic disclaimers as set forth on the last page of this document, and at www.bourns.com/legal/disclaimer.pdf. *RoHS COMPLIANTApplications Serviceentrance,branchandOEMpanels Electricalinfrastructures Equipmentandsystems Protectionfromlightning ProtectionfromACpower-inducedproblems 1251 Series Hardwired AC Hybrid Surge Protective Device (H-SPD) Product Dimensions N1 Configuration M22 102.11 (4.02) 15.49 (0.61) 59.69 87.88 (2.35) (3.46) N2 Configuration M22 102.11 (4.02) 15.49 (0.61) MM DIMENSIONS: (INCHES) 59.69 87.88 (2.35) (3.46) Asia-Pacific: Tel: +886-2 2562-4117 Email: asiacus bourns.com EMEA: Tel: +36 88 885 877 Email: eurocus bourns.com The Americas: Tel: +1-951 781-5500 Email: americus bourns.com www.bourns.com REV. 10/19 Specications are subject to change without notice. Users should verify actual device performance in their specic applications. The products described herein and this document are subject to specic disclaimers as set forth on the last page of this document, and at www.bourns.com/legal/disclaimer.pdf.