Specifications

B2
GE Limitamp
®
Medium Voltage Motor Control
Controllers
B
The standard contactors for industrial motor starters are
closed by a single magnet and are held closed by the same
magnet. This contributes to simplicity of mechanical design
and increases the mechanical life of the contactor. Standard
contactors may not need adjustment or mechanical repair
for many years, primarily due to mechanical simplicity and
sturdiness. However, preventive maintenance checks at least
once per year are recommended.
Low voltage on the contactor operating coil of an electrically
held contactor will cause the contactor to open. For most
motor applications, it is desirable to disconnect the motor
from the line when the system voltage is lost or lowered
appreciably; therefore, the electrically held contactor is
appropriate. The DC operating coil of the contactor is designed
to be used with a holding circuit to limit coil current. The
contactor coil is designed for use on 115 volts rectified AC or
125 volts DC.
For all NEMA Class E1 controllers, the contactor must be
capable of interrupting the available short-circuit current.
For these applications, instantaneous overcurrent relays
must be used to interrupt the contactor coil current. See
Table B.3 for additional technical specifications on the
vacuum contactor.
Table B.3 Vacuum Contactor Technical Specifications
Ratings CR193B
CR193D
CR193C
CR193E
Rated voltage (Volts) 5000 5000
Rated current (Amperes) 400 800
Short circuit interrupting current (kA) symmetrical 6.0 9.0
Class E1 MVA 50 75
E2 MVA 2400 volts
3600 volts
4160 volts
4800 volts
7200 volts
200
300
350
400
600
200
300
350
400
—
Short-time current (amperes)
30 seconds
1 second
2400
6000
4800
12,000
Impulse withstand (kV) 60 60
Dielectric strength 1 minute (kV)
(Power frequency dielectric test)
13.25 13.25
Vacuum integrity test (AC RMS) 20 kV 20 kV
Switching frequency (Operations/hour) 360 360
Mechanical life (Operations) 2 x 10
6
1 x 10
6
Electrical life (Operations) 1 x 10
6
0.25 x 10
6
Closing time (mS) 350 270
Opening time (mS)
(Switched on DC side of rectifier)
50 55
Pick-up voltage (% of rated) 85% min 85% min
Drop-out voltage (% of rated) 10 - 65% 10 - 65%
Control voltage (Volts) 115 rect. AC 115 rect. AC
Control circuit burden (VA)
Closing
Hold-in
175
30
550
110
Auxiliary contactsÀ
Ratings Current (amperes)
Voltage (volts)
Switching AC
DC
20 maximum
(N.O. or N.C.)
10
600
6 amperes at
600 volts
1 ampere at
240 volts
20 maximum
(N.O. or N.C.)
10
600
6 amperes at
600 volts
1 ampere at
240 volts
Contactor weight lb (kg) 77 (35) 114 (52)
Applicable standards UL 347
NEMA ICS 3,
Part 2
UL 347
NEMA ICS 3,
Part 2
7200
6.0
75
18.2