Features
■ 50 kA max. discharge current rating
■ Multi-pole uni-block design
■ DIN Rail mountable
■ UL 60691 compliant integrated thermal
disconnect
■ Visual fault indicator
■ Remote signalling capability
■ Compact design ideal for limited spaces
■ Standards compliance:
■ RoHS compliant*
1250 Series General Duty AC Surge Protective Device
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifi cations 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 specifi c applications.
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
intended to be installed at the front end of the installation, in the main switchboard, close
to sensitive terminals or in installations without LPS (lightning rods).
The Model 1250 Series is a single-pole module that can be confi gured for both common
mode and differential mode protection in single and three phase applications up to 480 V.
Electrical Characteristics
General Characteristics
Environmental Characteristics
Characteristic
Model No.
1250-xS-120 1250-xS-230 1250-xS-400 1250-xS-480
AC Network
120/240 V,
120/208 V
220/380 V,
240/415 V
220/380 V,
277/480 V,
347/600 V
347/600 V,
480 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)
15 Impulses 8/20 µs
20 kA
Max. Discharge Current (I
max
)
1 Impulse 8/20 µs
50 kA
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
Characteristic
Model No.
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
Characteristic
Model No.
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
Electrical DiagramGeneral Information
L/N
V : High energy varistor
Ft : Thermal fuse
C : Remote signaling contact
t° : Thermal disconnection system
1
.
1
1
.
2
1
.
4
C
Ft
V
