Specifications
Type SSM Specication Guide
12 Low Voltage Products & Systems
1SXU132173M0201 [AC 1007.2] - 2/02 ABB Inc. • 888-385-1221 • www.abb.com/lowvoltage
2) Data Sampling
(a) Critical operating data such as instantaneous current for Short Circuit, Ground Fault and Immediate
Overload calculations shall be sampled every 2 milliseconds to prevent lagging operation.
(b) Non-Critical data shall be obtained from a true RMS calculation circuit, and sampled in a 350
millisecond moving window of individual phase currents.
3) Real Time Clock with automatic leap-year updating shall be provided. This clock alone shall use a battery
back-up with a Lithium-Ion battery rated for at least 10 years of continuous operation without power
applied. The clock shall be capable of being reset in the eld after changing the battery, without affecting
any other stored information.
5.0 Mechanical Construction
Enclosure shall contain the digital solid state controller and disconnect means and other components as required.
Structure design shall be as follows:
A) Welded steel enclosures with a minimum thickness of 11 gauge will be provided to form rigid freestanding
dead front structures. Enclosure design shall be in accordance with NEMA ICS 3-2 and UL 347.
B) NEMA type 12 with full gasketing to protect internal components from contamination. Enclosure can be eld
upgraded to type 3R with the addition of a drip shield and drainage provisions.
C) Three isolated compartments shall be provided, dividing each starter assembly into:
1) A Main Incoming Power Compartment housing the main disconnect switch and horizontal power bus bars.
2) One or more Starter Power Compartments containing the fuses, vacuum contactors, SCR power modules,
instrument transformers and all other medium voltage devices.
3) A Low Voltage Control Compartment housing the digital microprocessor controller, LCD operator interface
and all other low voltage devices and operator controls.
4) Compartment doors shall be rolled and formed to be capable of containing maximum fault forces. Doors
shall open a minimum of 120º and include means for holding them open during servicing or testing.
D) Removable conduit entry plates shall be provided in the top and bottom of the enclosures to facilitate drilling
and punching of conduit holes without exposing the equipment to contamination from metal debris.
E) Enclosure nish shall be suitable for indoor or outdoor use in non-corrosive environments. Paint shall be ANSI
61 gray polyurethane powder over a zinc phosphate pre-treatment. Paint thickness shall be minimum 2 mil.
F) Lifting eyes or angles capable of supporting the maximum weight of each shipping split shall be provided on
the top of the enclosure.
G) Seismic Qualications: The entire starter assembly and installation procedures shall be suitable to withstand
vertical and horizontal accelerations typical of seismic Zones 1 through 4 as dened in the UBC. The assembly
will not overturn or show signicant lateral movement, but shall not be expected to continue operating during or
after a seismic event
6.0 Quality Requirements
A) All incoming material shall be inspected and/or tested for conformance to quality assurance.
B) Power semiconductors shall be fully tested for proper electrical characteristics (dv/dt, di/dt, etc.).
C) All subassemblies shall be inspected and/or tested for conformance to vendors engineering and quality
assurance specications.