Cut Sheet

41
Technical Data TD01701001E
Effective March 2017
UL low-voltage busway
Pow-R-Way III
EATON www.eaton.com
SPD plug-in devices
SPD Series (Figure 63)
The Pow-R-Way III plug-in device product offering includes a surge
protective device (SPD), which is ideal for busway fed distribution
systems. A transient voltage is a random, high energy, short duration
electrical anomaly. These high energy surges can disrupt, damage,
or destroy sensitive microprocessor-based equipment. Eaton has
developed the SPD family of products to ensure that quality power is
supplied to commercial, industrial, medical, and institutional facilities.
The SPD not only protects against externally created impulse
transients such as lightning, utility capacitor switching, and
disturbances emitted by adjacent facilities, but it also provides
needed protection against internal transients. This type of transient
is generated within a facility’s own distribution system. Sources of
internally generated, or ringwave, transients are imaging, equipment,
variable frequency drives, lighting dimmers, arc welders, and the
switching on and off of electrical distribution equipment. It is
estimated that over 80% of surge disturbances are actually
caused by internal transients.
The SPD also filters repetitive electrical line noise (EMI/RFI),
which is defined as any unwanted electrical signal that produces
undesirable effects in the circuits of sensitive electronic equipment
or disturbances that are two times peak voltage. The suppression
of AC transients is accomplished through the use of metal oxide
varistors (MOVs) that provide a low impedance path to divert surges
away from loads. Electrical line noise and ringing transients are
eliminated by adding filtering capacitors to the suppression device.
Not all SPD units on the market have filtering capabilities. The
benefits of combining SPD and filtering are reduced MOV stress,
resulting in a longer life cycle, lower let-through voltage, better
noise attenuation levels, and increased reliability.
Without protection devices, electronic-based loads and
microprocessors are not provided with the noise- and disturbance-
free power that they require. Because microprocessors are now
common in those facilities, specifiers must ensure that the AC
power supply is properly filtered. Significant performance advantages
are achieved by integrating SPD filters into busway systems.
Because the SPD unit is directly connected to the busway it is able
to minimize let-through voltage and to isolate critical loads that are
fed from a protected busway run. Due to the integrated design, the
SPD bus plug saves the user-needed wall space and greatly reduces
the installed project cost. The SPD bus plug is furnished with a
breaker disconnect. For catalog numbers and selection criteria,
see Table 57 below.
Figure 63. Surge protective device (SPD Series) bus plug
Table 57. SPD bus plugs catalog numbering system
ote:N Available for Pow-R-Way III plugs. This information is required for all quotations. This information should also be included at order entry to ensure prompt
processing of the order.
P3BSPD 250 480Y 2 C
Fixed—do not change
Surge rating (kA/phase)
50
80
100
120
160
200
250
300
400
Diagnostics package
1 = Basic—Dual-colored LED per phase to indicate protection
status of the N–G mode on units with a neutral wire,
single-colored LED to indicate the lack of a neutral wire
connection on systems with a neutral wire.
2 = Standard—Dual-colored LED per phase to indicate
protection status of the N–G mode on units with a neutral
wire, single-colored LED to indicate the lack of a neutral
wire connection on systems with a neutral wire, audible
alarm with silence button, and Form C relay contact.
3 = Standard + surge counter—Dual-colored LED per phase
to indicate protection status of the N–G mode on units
with a neutral wire, single-colored LED to indicate the lack
of a neutral wire connection on systems with a neutral
wire, audible alarm with silence button, Form C relay
contact, EMI/RFI filtering providing up to 50 dB of noise
attenuation from 10 kHz to 100 MHz, and surge counter
with reset button.
Fixed—do not change
Voltage code
208Y = 208Y/120 V (4W + G)
400Y = 400Y/230 V (4W + G)
480Y = 480Y/277 V (4W + G)
600Y = 600Y/347 V (4W + G)
240D = 240 delta (3W + G)
480D = 480 delta (3W + G)
600D = 600 delta (4W + G)