Spec Sheet
POWERCOMMAND
®
OTEC TRANSFER SWITCH SPEC SHEET
TRANSFER SWITCH MECHANISM
A bi-directional linear motor actuator powers
the transfer switch. This design provides virtually
friction-free, constant force, straight-line transfer
switch action with no complex gears or linkages.
Independent break-before-make action is used
for this transfer switch.
A mechanical interlock prevents simultaneous
closing of normal and emergency contacts.
Electrical interlocks prevent simultaneous closing
signals to normal and emergency contacts and
interconnection of normal and emergency sources
through the control wiring.
High pressure silver alloy contacts resist burning
and pitting. Separate arcing surfaces further protect
the main contacts. Contacts are mechanically
held in both normal and emergency positions for
reliable, quiet operation.
Contact wear is reduced by multiple leaf arc
chutes that cool and quench the arcs. Barriers
separate the phases to prevent interphase
ashover. A transparent protective cover allows
visual inspection while inhibiting inadvertent contact
with energized components.
Switch mechanism, including contact assemblies, is
UL 1008 certied to verify suitability for applications
requiring high endurance switching capability for
the life of the transfer switch. Withstand and
closing ratings are validated using the same set
of contacts, further demonstrating the robust
nature of the design.
SPECIFICATIONS
Voltage rating 240 V AC, 60 Hz.
Arc interruption Multiple leaf arc chutes provide dependable arc interruption.
Neutral bar A full current-rated neutral bar with lugs is standard on enclosed 3-pole transfer switches.
Auxiliary contacts
Two isolated contacts (one for each source) indicating switch position are provided for customer
use. Contacts are normally open, and close to indicate connection to the source. Wired to
terminal block for easy access. Rated at 10 A Continuous and 250 V AC maximum.
Operating temperature -13 ˚F (-25 ˚C) to 140 ˚F (60 ˚C)
Storage temperature -40 ˚F (-40 ˚C) to 140 ˚F (60 ˚C)
Humidity Up to 95 % relative, non-condensing
Altitude Up to 10,000 ft (3,000 m) without derating
Surge withstand ratings Control tested to withstand voltage surges per EN60947-6-1.
Total transfer time
(source-to-source)
Will not exceed 6 cycles at 60 Hz with normal voltage applied to the actuator and without
programmed transition enabled.
Manual operation*
Transfer switch mechanisms are equipped with means to manually transfer. All sources must
be de-energized before manual operation is attempted.
Overcurrent
disconnect device
Service entrance switches have a Square D UL 489 listed molded case circuit breaker.
*See Operator Manual for further details.