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AC Controls
Manual Motor Starters and Contactors
Application
Across the line manual motor starters
and contactors provide control for
machinery where start stop remote con-
trol is not required (optional remote stop
available). Class 11 manual starters are
used for single and polyphase motors up
to 10 Hp. Starters have melting alloy
overload relays which help protect
against damage due to excessive current
caused by a sustained overload, low line
voltage, or single phasing of the motor.
Contactors provide control for inherently
protected motors. Typical applications
include metal and wood-working machin-
ery, grinders, power saws, conveyors,
fans pumps, blowers, textile and packag-
ing machinery, slitters, and paper cutters.
Features
Class 11 manual controllers have front
accessible pressure type wire connec-
tors. Ample wiring space is provided for
easy wiring.
A complete line of general purpose and
industrial duty enclosures is available as
well as open type mounting for custom
built enclosures. These manual con-
trollers are available with low voltage pro-
tection which will automatically open the
power poles when the voltage drops or
the power is interrupted. A remote stop
function may be incorporated with the
low voltage protection coil as a factory
option to provide remote or semi-auto-
matic operation.
Class 11 controllers provide the OSHA
requirements for protecting personnel
from potential injury caused by the auto-
matic start up of machinery following a
voltage drop or power interruption when
low voltage protection is specified.
Open styles and devices in NEMA 1, 4, 7
& 9, 12 enclosures can be padlocked in
the OFF position.
15
290
Siemens Electrical Products and Systems
Specification Guide
General / Wiring Diagrams
Table 15.11
Class 11 Manual Motor Starters
Maximum Horsepower
Type
Size
115 Volts
200/230 Volts
M0
1
1-Phase
M1
2
M1P
3
Type
Size
200/230 Volts
460/575 Volts
M0
3
3-Phase
1
M1
7
⁄
2
CSI Section 16160
2
3
5
5
10
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