Features Compact design ideal for limited spaces 50 kA max. discharge current rating Multi-pole uni-block design Standards compliance: DIN Rail mountable RoHS compliant* UL 60691 compliant integrated thermal disconnect Visual fault indicator Remote signalling capability 1250 Series General Duty AC Surge Protective Device General Information Electrical Diagram L/N . The Bourns Model 1250 Series is a general duty Surge Protective Device (SPD) designed to protect high risk electrical service entrance and branch panels. This SPD is C intended to be installed at the front end of the installation, in the main switchboard, close V : High energy varistor Ft to sensitive terminals or in installations without LPS (lightning rods). Ft : Thermal fuse C : Remote signaling contact The Model 1250 Series is a single-pole module that can be con gured for both common V t : Thermal disconnection system mode and differential mode protection in single and three phase applications up to 480 V. Electrical Characteristics Model No. Characteristic 1250-xS-120 1250-xS-230 1250-xS-400 1250-xS-480 220/380 V, 120/240 V, 220/380 V, 347/600 V, AC Network 277/480 V, 120/208 V 240/415 V 480 V 347/600 V Connection Mode 1-Pole, L-N or L-G AC System IT, TT, TN, Single, Split Phase, Delta, Wye Max. Operating Voltage (MCOV) 150 V 275 V 420 V 550 V TOV Withstand 230 V 440 V 440 V 770 V Leakage Current at Uc < 1 mA Follow Current None UL Nominal Discharge Current (In) 20 kA 15 Impulses 8/20 s Max. Discharge Current (I ) max 50 kA 1 Impulse 8/20 s UL Voltage Protection Rating (VPR) 700 V 1000 V 1200 V 1800 V Protection Level (Up) 0.9 kV 1.25 kV 1.8 kV 2.5 kV UL Short-Circuit Current Rating (SCCR) 100kAIC General Characteristics Model No. Characteristic 1250-xS-120 1250-xS-230 1250-xS-400 1250-xS-480 Thermal Disconnector UL 60691 Overcurrent Protection Time Delay - 125 A Max. Connection By Screw Terminals, 6 AWG Max. Dimensions 90 x 18 x 67 mm / (3.543 x 0.709 x 2.638 In.) Mounting DIN Rail, 35 mm Symmetrical Remote Signal Indicator 250 Vac Max., 2 A Enclosure Material Thermoplastic UL 94V0 Environmental Characteristics Model No. Characteristic 1250-xS-120 1250-xS-230 1250-xS-400 1250-xS-480 Operating Temperature -50 C to +85 C Operating Altitude 13,000 ft. (4,000 m) Relative Humidity 5 to 95 % Non-condensing, up to 100 % External Environmental Rating IP 20 *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 COMPLIANT 1 4 1 1 1 2Applications Electrical service entrance Branch panels 1250 Series General Duty AC Surge Protective Device Product Dimensions and Schematics 1250-1S-xxx 67.0 10.6 18.0 (2.638) (.417) (.709) L/N L/N Mi Ft t AC Surge Protector 90.0 SPD1250-xxx (3.543) Uc V In Imax Up C 1250-2S-xxx 67.0 (2.638) 36.0 (1.417) L/N L/N 90.0 (3.543) L N Mi Mi Ft Ft MM t t DIMENSIONS: AC Surge AC Surge (INCHES) Protector Protector SPD1250-xxx SPD1250-xxx Uc Uc In In V V Imax Imax Up Up 44.0 10.6 (1.732) C (.417) 60.8 (2.394) 1250-3S-xxx 54.0 (2.126) L1 L2 L3 L L L Mi Mi Mi Ft Ft Ft t t t AC Surge AC Surge AC Surge Protector Protector Protector SPD1250-xxx SPD1250-xxx SPD1250-xxx Uc Uc Uc V V V In In In Imax Imax Imax Up Up Up C 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.