Specification Sheet

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©2013 Cummins Power Generation Inc. | S-1639b (6/13)
Specification sheet
Transfer switch
OTEC and OTECSE
open transition
125-600 Amp
Description
OTEC transfer switches are designed for
operation and switching of electrical loads
between primary power and standby generator
sets. They are suitable for use in emergency,
legally required, and optional standby
applications. The switches monitor both power
sources, signal generator set startup,
automatically transfer power, and return the load
to the primary power source once a stable utility
is available.
The fully integrated controller is designed for
practical functionality, with LED indicators and
digital pushbuttons for ease of operator use.
The service entrance transfer switch meets UL
1008 standards for service entrance applications.
The switch contains an UL-listed overcurrent
disconnect device on the main incoming utility
source.
All switches are UL 1008 Listed with
UL Type Rated cabinets and UL
Listed CU-AL terminals.
All switches are certified to CSA 282
Emergency Electrical Power Supply
for Buildings, up to 600 VAC.
NEC
Equipment shall be suitable for use
in systems compliant to 700, 701
and 702.
All switches comply with NFPA 70,
99 and 110.
All switches comply with NEMA ICS
10.
All switches comply with IEEE 446
Recommended Practice for
Emergency and Standby Power
Systems.
This transfer switch is designed and
manufactured in facilities certified to
ISO9001.
Features
Microprocessor control - Easy-to-use, standard
control. LEDs display transfer switch status;
pushbuttons allow operator to activate control test,
exercise timing and transfer mode.
Overcurrent disconnect device (on SE models)
– Square D UL-Listed 489 molded case circuit
breaker.
Programmed transition – Open transition timing
can be adjusted to completely disconnect the load
from both sources for a programmed time period, as
recommended by NEMA MG-1 for transfer of
inductive loads.
Advanced transfer switch mechanism - Unique
bi-directional linear actuator provides virtually friction-
free, constant force, straight-line transfer switch
action during automatic operation.
Manual operation - Manual operating handles,
shielded termination, and over-center contact
mechanisms allow effective manual operation under
de-energized conditions.
Positive interlocking - Mechanical and electrical
interlocking prevent source-to-source connection
through the power or control wiring.
Main contacts - Heavy-duty silver alloy contacts
with multi-leaf arc chutes are rated for 100% load
interruption. They require no routine contact
maintenance and provide 100% continuous current
ratings.
Easy service/access - Single-plug harness
connection and compatible terminal markings simplify
servicing. Access space is ample. Door-mounted
controls are field-programmable; no tool is required.
Complete product line - Cummins Power
Generation offers a wide range of equipment,
accessories and services to suit virtually any backup
power application.
Warranty and service - Products are backed by a
comprehensive warranty and a worldwide network of
distributors with factory-trained service technicians.