Features
■ Hybrid protection technology
■ Extremely low leakage current
■ Heavy duty surge protection
■ LED indicators and audible alarm
■ Compact form factor
■ Indoor or outdoor installation
■ UL1449 4th Edition
■ RoHS compliant*
1251 Series Hardwired AC Hybrid Surge Protective Device (H-SPD)
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 U
T
150 VAC
Nominal Discharge Current in 15
Applications of 8/20 μs Impulse Waveform
I
n
20 kA
Maximum Discharge Current
8/20 μs Withstand Single Operation
I
max
50 kA
Overvoltage Protection Rating (3 kA) V
pr
700 VAC
Protection Level at In U
p
-I
n
1200 VAC
Short Circuit Current Rating I
sccr
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
Packaging Specifications
1251 - xxxx - xx
Series
Configuration
Nominal (Operating) Voltage
120S = 120 VAC
208Y = 120/208 VAC
240S = 120/240 VAC
N1= Wiring/Nipple Right Side Exit
N2 =Wiring/Nipple Rear Exit
1251 Series ...................one unit per box
*RoHS COMPLIANT
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific disclaimers as set forth on the last page of this document, and at
www.bourns.com/legal/disclaimer.pdf.
1251 Series Hardwired AC Hybrid Surge Protective Device (H-SPD)
Product Dimensions
N1 Configuration
N2 Configuration
REV. 10/19
Applications
■ Service entrance, branch and OEM panels
■ Electrical infrastructures
■ Equipment and systems
■ Protection from lightning
■ Protection from AC power-induced problems
DIMENSIONS:
MM
(INCHES)
87.88
(3.46)
59.69
(2.35)
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)
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific disclaimers as set forth on the last page of this document, and at
www.bourns.com/legal/disclaimer.pdf.
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