Effective 11/97
I.B. 48003
Cutler-Hammer
Instructions for 36" Wide Vacuum-Break Starters
Rated 360 Amperes, 7200 Volts, Slide-Out Type
Fig. 1 Ampgard® Motor Controller, 36" Wide
DANGER
HAZARDOUS VOLTAGE.
READ AND UNDERSTAND THIS BOOKLET IN ITS
ENTIRETY BEFORE INSTALLING OR OPERATING
CONTROLLER. INSTALLATION, ADJUSTMENT, REPAIR
AND MAINTENANCE OF THESE CONTROLLERS MUST
BE PERFORMED BY QUALIFIED PERSONNEL. A
QUALIFIED PERSON IS ONE WHO IS FAMILIAR WITH
THE CONSTRUCTION AND OPERATION OF THIS
EQUIPMENT AND THE HAZARDS INVOLVED.
THE CONTROLLER
Each Ampgard
®
motor starter (controller) consists of one
nonload-break isolating switch, one or more Type SJS,
NEMA Size H6, vacuum-break contactors, current-limiting
fuses, a set of current transformers, and some form of
overload protection. The isolating switch has a limited
make and break rating, suitable only for closing and
opening limited magnetizing current loads. The controller is
designed to start, stop and protect a three-phase medium-
voltage motor within the ratings shown in Table I. The
controller may also be used to switch transformer windings
or capacitor banks. Each Ampgard
®
controller occupies all
or a portion of a steel structure that may also enclose a
horizontal bus system to distribute power to two or more
sections and a vertical bus system in each section con-
nected to the horizontal main bus system. The controllers
are configured for full-voltage or reduced-voltage starting,
reversing or nonreversing, single-speed or two-speed
applications.
TABLE I. AMPGARD
®
EQUIPMENT RATINGS
Continuous
50 or 60 Hertz
Interrupting Capacity, 50-60 Hz
Isolating
Range Of
Normal
Current
Horsepower Rating
(rms) Symmetrical At
Switch
System
Utilization
Rating
Synchronous Motor
Induction
Nominal Utilization Voltage
Make/Break
Voltage
Voltage
Enclosed
80% P.F.
100% P.F.
Motor
Fuses
Controller
Ratings
2200-2500
2300
360A
1500
1750
1500
50,000 Amp
200,000 kVA
750 VA
3800-5000
4000
360A
2500
3000
2500
50,000 Amp
350,000 kVA
600 VA
6200-7200
6600
360A
4000
5000
4000
50,000 Amp
570,000 kVA
600 VA
Nonmotor Applications at: >>>>>>>>>
2200 - 2500 Volts
3800 - 5000 Volts
6200 - 7200 Volts
Transformer Switching Rating =
1250 kVA
2250 kVA
3000 kVA
Capacitor Switching Rating =
1200 kVAR
2100 kVAR
2400 kVAR
