Atec Simplex-Merlin - Manual (Page 2)

®
MERLIN
100KW - 400KW Load Bank • Page 2
Simplex, Inc.
5300 Rising Moon Road
Springfi eld, IL 62711-6228 217-483-1600
Fax 217-483-1616
www.simplexdirect.com © 2012 Simplex, Inc. All Rights Reserved.
Printed in the USA • 1103-03.01
Design subject to change without notice.
Powr-Web Resistive Load
Element
Description
Simplex Load Banks utilize the “Powr-
Web” Load Element (a UL Recognized
Component). The “Powr-Web” is an
advanced design, air-cooled power
resistor specifi cally designed for
application to load bank systems. The
“Powr-Web” is conservatively operated
at half the maximum temperature rating
of the alloy and features a short-circuit-
safe design based on continuous
mechanical support of the resistor by
high temperature, ceramic clad stainless
steel rods.
Construction
• Precision calibrated to specifi c ohmic
value
• All load elements are continuously
supported by vibration resistant,
ceramic clad, stainless steel through-
rods.
Specifi cations
• Alloy: FeCrAl
• Maximum continuous temperature
rating: 1920°F
• Maximum operating temperature as
applied in Load Bank: 1080° F
• Cool down time from operating to
ambient temperature is 10 seconds.
Branch Circuit Fuse
Protection
The load of a resistive load bank
consists of a dense array of open,
uninsulated power resistors mounted
within a cooling air stream. Since
the elements are electrically live, it is
possible for a foreign object to penetrate
the element array and create a short
circuit of adjacent elements or a short to
ground. Since the elements are densely
packed, it is possible for a short circuit,
once started, to rapidly propagate
through the entire element array. As
a load bank represents a relatively
large amount of power concentrated
within a relatively small volume, a self-
propagating, cascading short circuit
would have catastrophic results.
Simplex virtually eliminates the
dangers of short circuit through the
use of branch circuit fuse protection of
the load elements. Per NEC 110-10,
protective devices shall clear a fault
without “extensive damage” to the circuit
components. A Simplex Load Bank is
divided into branch circuits of not more
than 50 KW each.