Capabilities of the Emerson Network Power 560 Surge Protective Device
White Paper - April 2013
560 Surge Protective Device (SPD): The Emerson Network Power 560 SPD is a
true modular device incorporating a status module and independent surge
modules for each mode of protection: line-to neutral, line-to-ground, and
neutral-to ground. The independent surge modules are bolted to low impedance
(Low-Z) copper conduction plates to construct a reliable individual phase of
protection. Each individual phase of protection can range in size from one to eight
modules. A phase of protection consisting of two or more modules incorporates
the latest in computer assisted manufacturing techniques to obtain matched
modules for increased surge current capability and long term reliability.
All individual phases are then bolted to a copper backplane and placed in a heavy
duty NEMA 4 dust-tight, drip-tight enclosure. Connection to the 560 SPD is
accomplished by either a direct connection to the individual phases of protection or to an optional heavy duty,
surge-rated disconnect. From an external position, an operator can determine the status of the individual phases
of protection by examining the operational LED indicators through a window in the NEMA 4 enclosure. In addition,
without opening the enclosure, the optional surge and swell counters can be monitored or reset, and the
industries first, standard, fully-functional built-in-test (BIT) feature can be activated and observed.
The 560 features our industry leading, fuse technology and has been tested and evaluated by Underwriters
Laboratories as being capable of interrupting symmetrical fault currents of up to 200,000 amperes, with 480 volts
applied. Testing was carried out on the complete product, includes: status modules, disconnect, Low-Z bussing,
and surge modules.
The 560 Surge Modules: The surge suppression module of the 560 SPD
represents a significant advancement in technology over competing designs.
The latest advancement of the surge module also utilizes small diameter,
metal-oxide varistors (MOVs) incorporating multiple 25 mm MOVs paralleled
for increased performance and reliability.
Keeping with the long tradition of leading-edge technology and performance
established by the first generation of Emerson Network Power SPDs, the
surge modules incorporate a custom; thermally stable, phenolic coating on
each MOV and high-temperature, polyimide printed wiring boards. Using
improved geometrical configurations to balance the MOVs and fuse-links components, results in improved surge
current performance and over-voltage withstand capability. Coordination of the MOV/fuse-link suppression path
ensures that the MOVs can deliver the rated surge current performance without interruption of the fuse-link.
560 SPD Status Indication: Monitoring capabilities of the surge modules consist of monitoring the incoming
voltage and fuse-links to provide accurate, real-time status indication. Indication is provided through four means
of communication: two are visual, one is audible and one is remote. The first audible form of indication is through
the standard sonic alarm. The sonic alarm activates when a reduced protection, phase-loss, or under-voltage
condition is sensed.
The first form of visual indication is by means of the individual phase of protection LEDs located behind the
plexi-glass barrier on the front cover of the NEMA 4 enclosure. Green LED indicators on the phases of protection
signify all systems are functioning. The red LEDs on the same phases of protection indicate a reduced protection
mode. The second means of visual communication is a green LED located on every surge module. Remote
indication is provided via dual set of Form ‘C’ Contacts. Both the Form ‘C’ Contacts and the appropriate LEDs
change state when a reduced protection scenario, phase loss, or under-voltage condition is detected.
The 560 SPD features a fully-functional built-in test (BIT) panel. This feature allows the device to perform a full self
check of the logic buss and components, and during a reduced protection scenario, determine the percent of
protection available of the individual phases. When activated from the test switch on the front panel, the BIT
circuit triggers the entire indication circuit. The BIT trigger forces the indication circuit to re-orient thereby
checking the integrity of the surge module components, the status communications buss, and the associated
logic circuitry used to provide overall status communication to the operator. While in the test mode, a yellow LED
is illuminated to inform the operator. The BIT tests each phase of protection individually. Indication is provided to
the operator by a change in states of the LED indicators on the front panel and the presence of the sonic alarm.
Performing the BIT function takes approximately three seconds per phase of protection, including neutral-to
ground if provided.
The percent protection feature provides valuable information to the operator protecting critical loads and
processes. This standard feature gives the operator added confidence by indicating the remnant performance
capability of the Interceptor during a rare reduced protection event. By engaging the BIT function, the device
cycles through the individual surge modules and provides information on the remaining performance attributes of
the device.
The 560 SPD is available with an optional surge and swell transient counters. The surge counter option contains
electronic circuitry capable of detecting over-voltage transients applied to the device. The swell counter option
contains similar electronic circuitry modified to look at long duration over-voltage events called voltage swells.
Both counters are viewable through the NEMA 4 window and can be reset from the front panel display.
100 Emerson Parkway
Binghamton, NY 13905
P (607) 721 8840
P (800) 288 6169
F (607) 722 8713
E contactsurge@emerson.com
WP-30024
Rev.1
4/13