1251

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Features
■ Hybrid protection technology
■ UL1449 4th Edition
■ Extremely low leakage current
■ RoHS compliant*
■ Heavy duty surge protection
■ LED indicators and audible alarm
■ Compact form factor
■ Indoor or outdoor installation
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
Electrical Distribution System
Nominal (Operating) Voltage
1251-120S
1251-208Y
1251-240S
120 VAC
Single Ph
120 / 208 VAC
3 Ph Wye
120 / 240 VAC
Single Ph
120 VAC
120 / 208 VAC
120 / 240 VAC
Maximum Operating Voltage
MCOV
150 VAC
Temporary Overvoltage Withstand
UT
150 VAC
Nominal Discharge Current in 15
Applications of 8/20 µs Impulse Waveform
Maximum Discharge Current
8/20 µs Withstand Single Operation
20 kA
Imax
50 kA
Overvoltage Protection Rating (3 kA)
Vpr
700 VAC
Protection Level at In
Up-in
1200 VAC
Short Circuit Current Rating
Isccr
Disconnection Features / Options
Thermal Disconnect................................................................................................ Internal
Fuses or Circuit Breakers ............................................................................................ 40 A
Ground Fault Breaker (if Installed) ............................................................Type S or Delay
Mechanical Characteristics
Enclosure............................................................................................................ Aluminum
Environmental Rating ...............................................................................IP 66 / NEMA 4x
Operating Temperature.............................................................................-40 °C to +85 °C
Mounting ......................................................................................................Bulkhead (3/4)
Weight .....................................................................................................................2.5 lbs.
Disconnection Indicator ........................................................LED off and audible alarm on
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)
100 kA
How To Order
1251 - xxxx - xx
Series
Nominal (Operating) Voltage
120S = 120 VAC
208Y = 120/208 VAC
240S = 120/240 VAC
Configuration
N1= Wiring/Nipple Right Side Exit
N2 =Wiring/Nipple Rear Exit
Packaging Specifications
1251 Series ................... one unit per box
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 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
Applications
■ Service entrance, branch and OEM panels
■ Electrical infrastructures
■ Equipment and systems
■ Protection from lightning
■ Protection from AC power-induced problems
1251 Series Hardwired AC Hybrid Surge Protective Device (H-SPD)
Product Dimensions10
N1 Configuration
M22
102.11
(4.02)
15.49
(0.61)
59.69
(2.35)
87.88
(3.46)
N2 Configuration
M22
102.11
(4.02)
15.49
(0.61)
DIMENSIONS:
87.88
(3.46)
MM
(INCHES)
59.69
(2.35)
Asia-Pacific: Tel: +886-2 2562-4117 • Fax: +886-2 2562-4116
EMEA: Tel: +36 88 520 390 • Fax: +36 88 520 211
The Americas: Tel: +1-951 781-5500 • Fax: +1-951 781-5700
www.bourns.com
10/15
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.