Features
n Hybrid protection technology
n Extremely low leakage current
n Heavy duty surge protection
n LED indicators and audible alarm
n Compact form factor
n Indoor or outdoor installation
n UL1449 4th Edition
n RoHS compliant*
1251 Series Hardwired AC Hybrid Surge Protective Device (H-SPD)
*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.
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
Characteristic Model No.
1251-120S 1251-208Y 1251-240S
Electrical Distribution System 120 VAC
Single Ph
120 / 208 VAC
3 Ph Wye
120 / 240 VAC
Single Ph
Nominal (Operating) Voltage 120 VAC 120 / 208 VAC 120 / 240 VAC
Maximum Operating Voltage MCOV 150 VAC
Temporary Overvoltage Withstand UT150 VAC
Nominal Discharge Current in 15
Applications of 8/20 µs Impulse Waveform In20 kA
Maximum Discharge Current
8/20 µs Withstand Single Operation Imax 50 kA
Overvoltage Protection Rating (3 kA) Vpr 700 VAC
Protection Level at In Up-In1200 VAC
Short Circuit Current Rating Isccr 100 kA
General Information
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
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)
How To Order
1251 - xxxx - xx
Series
Nominal (Operating) Voltage
120S = 120 VAC
208Y = 120/208 VAC
240S = 120/240 VAC
Conguration
N1= Wiring/Nipple Right Side Exit
N2 =Wiring/Nipple Rear Exit
Packaging Specications
1251 Series ...................one unit per box
*RoHS COMPLIANT
LEAD FREE
*RoHS COMPLIANT
VERSIONS
AVAILABLE
LEAD FREE
VERSIONS ARE
RoHS COMPLIANT*
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.
1251 Series Hardwired AC Hybrid Surge Protective Device (H-SPD)
Product Dimensions
REV. 07/16
Applications
n Service entrance, branch and OEM panels
n Electrical infrastructures
n Equipment and systems
n Protection from lightning
n Protection from AC power-induced problems
DIMENSIONS: MM
(INCHES)
1252-240S-N1
1252 Series
www.bourns.com
AC Power
Surge Protective Device
88
(3.47)
87.88
(3.46)
59.69
(2.35)
88
(3.47) 65
(2.56)
15.49
(0.61)
M22
102.11
(4.02)
87.88
(3.46)
59.69
(2.35)
M22
15.49
(0.61)
102.11
(4.02)
1252-240S-N1
1252 Series
www.bourns.com
AC Power
Surge Protective Device
88
(3.47)
87.88
(3.46)
59.69
(2.35)
88
(3.47) 65
(2.56)
15.49
(0.61)
M22
102.11
(4.02)
87.88
(3.46)
59.69
(2.35)
M22
15.49
(0.61)
102.11
(4.02)
1252-240S-N1
1252 Series
www.bourns.com
AC Power
Surge Protective Device
88
(3.47)
87.88
(3.46)
59.69
(2.35)
88
(3.47) 65
(2.56)
15.49
(0.61)
M22
102.11
(4.02)
87.88
(3.46)
59.69
(2.35)
M22
15.49
(0.61)
102.11
(4.02)
1252-240S-N1
1252 Series
www.bourns.com
AC Power
Surge Protective Device
88
(3.47)
87.88
(3.46)
59.69
(2.35)
88
(3.47) 65
(2.56)
15.49
(0.61)
M22
102.11
(4.02)
87.88
(3.46)
59.69
(2.35)
M22
15.49
(0.61)
102.11
(4.02)
N1 Conguration
N2 Conguration
Asia-Pacic: Tel: +886-2 2562-4117 • Email: asiacus@bourns.com
EMEA: Tel: +36 88 520 390 • Email: eurocus@bourns.com
The Americas: Tel: +1-951 781-5500 • Email: americus@bourns.com
www.bourns.com