Spec Sheet

POWERCOMMAND
®
OTEC TRANSFER SWITCH SPEC SHEET
TRANSITION MODES
Open delayed transition – In this transition mode
the time required for the transfer switch to transfer
between sources is adjustable so that the load-
generated voltages decay to a safe level before
connecting to an energized source. Recommended
by NEMA MG-1 to prevent nuisance tripping breakers
and load damage. Adjustable 0.5 secs - 10 minutes,
and default 0.5 seconds.
UL 1008 WITHSTAND AND CLOSING RATINGS (WCR)
Withstand and Closing Ratings (WCR) are stated in symmetrical RMS amperes.
Frame Amperage
With specific
MCCB (kA at 480V)
Square-D breaker
part number
Cummins
part number
Trip unit
B 225 65 LJM36250CU31X A046F867 Micrologic 3.3 (LI)
Open in-phase translation – Initiates open transition
transfer when in-phase monitor senses both sources
are in phase (voltage, phase and frequency). Operates
in a break-before-make sequence. Includes ability
to enable programmed transition as a backup. The
module waits indenitely for synchronization unless the
‘Return to programmed transition’ function is active in
which case after 2 minutes it performs a programmed
delayed transfer
TRANSFER SWITCH LUG CAPACITIES
Frame
Amperage
rating (A)
Emergency and load
power cables
Emergency and load
neutral cables
Service power cables Service neutral
Cables
per
phase
Cable size
Number
of
Cables
Cable size
Cables
per
phase
Cable size
Number
of
Cables
Cable size
B 225 1
#6 AWG-400
MCM CU/AL
2
#6 AWG-400
MCM CU/AL
1
#2 OWG-600
MCM CU or
#2 AWG-500
MCM AL
1
#6 AWG-
400 MCM
CU/AL
*All lugs 90°C rated and accept copper or aluminum wire unless indicated otherwise.
Refer to the latest NFPA 70 Article 310 - Conductors for general wiring for the ampacity calculations.
ENCLOSURE
The transfer switch and control are wall-mounted in a key-locking enclosure. Wire bend space complies with 2017 NEC.
OTEC SERVICE ENTRANCE DIMENSIONS – TRANSFER SWITCH IN UL TYPE 3R ENCLOSURE
Frame Amperage rating (A) Height Width Depth Weight
in mm in mm in mm lb kg
B 225 73.6 1869 32.3 820 19.7 499 580 263
OTEC DRAWING PART NUMBERS
Outline Drawing
Frame Amperage rating (A) Type 3R
B 225 A065S434
WIRING DIAGRAM PART NUMBERS
Wiring Diagram
Frame Amperage rating (A)
Utility to Genset
(120 – 480 V)
Interconnection
B 150, 200, 225, 250 A065H781 A065H780
ENCLOSURE ACCESS FOR CABLE INSTALLATION AND MAINTENANCE
All frames allow for top, side, and bottom cable entry. NEC Requires Minimum 36” Front Access. Additional
front clearance is needed to remove the mechanism. Refer to the outline drawing.