2
V
Hazardous voltage.
Will cause death or serious injury.
KEEP OUT.
Qualified personnel only.
Disconnect and lock off all power before working
on this equipment.
V
DANGER
Figure 2
Dimensions & Weight
Device Operation
SPDs sense overvoltage conditions and create a momentary
short circuit to redirect harmful surge energy to earth ground,
resetting automatically waiting for the next surge. Operation
is similar to a pressure relief valve on a water heater: pressure
builds, valve opens to relieve pressure, resets when pressure
drops. SPDs are capable of repeating this function thousands
of times before needing replacement.
Voltage Rating & Application:
Before installing your STXP, verify by nameplate voltage or
model number that it has the same voltage rating as the
power distribution system. DO NOT INSTALL ANY LOWER
VOLTAGE RATED PRODUCT. See attached Advisor Data
Sheet or call Mersen Technical Services at (978) 465-4853
for help.
The system configuration is defined by the secondary
windings of the transformer supplying the service entrance
main or load. This includes whether or not the transformer
windings are referenced to earth via a grounding conductor.
The system configuration is not based on any specific load
or equipment connection. SPDs should be installed per
the distribution system, not per a load or motor’s wiring
connection. For example: A 480V three phase motor
appears to be connected in 480V Delta. In reality, the
distribution system is configured as a 480Y/277V grounded
Wye, with or without a neutral pulled to the motor or MCC.
The system is a 480Y/277V Wye, even though the load
is connected as a Delta. A grounded Wye has a defined
reference to ground (i.e., neutral is bonded to ground). In
contrast, some Delta systems are ungrounded, which have
no reference to ground.
WARNING SPDs on Ungrounded Systems
Caution
– Ungrounded systems are inherently unstable
and can produce excessively high line-to-ground voltages
during certain fault conditions. During these fault conditions,
any electrical equipment including SPDs, may be subjected
to voltages which exceed their designed ratings. This
information is being provided to the user so that an informed
decision can be made before installing any electrical
equipment on an ungrounded power system.
STXP Series SPDs have high SCCR (short circuit
current ratings) capacity including the lead conductors.
Supplemental overcurrent protection is not required to
protect your STXR SPD. However, NEC
®
convention
requires that connecting conductors have overcurrent
protection in Type 2 or 4 applications. Follow applicable
codes. Your STXP device features internal overcurrent and
over temperature protection that will disconnect effected
surge suppression components at end of life. Power to the
load is maintained but unprotected and the STXR should
be replaced as soon as possible. The STXP SPD is factory
sealed and contains no serviceable parts.
3.00
(76.20)
0.19
(4.83)
8.28
(210.31)
3.67
(93.22)
2.21
(56.13)
7.41
(188.21)
Weight: 3lbs (1.4kg)
