AC Controls

Manual Motor Starters and Contactors

General / Wiring Diagrams

15

AC Controls

Application

Across the line manual motor starters and contactors provide control for machinery where start stop remote control 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 packaging 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 controllers are available with low voltage protection 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-automatic operation.

Class 11 controllers provide the OSHA requirements for protecting personnel from potential injury caused by the automatic 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.

Table 15.11

Class 11 Manual Motor Starters

 

Maximum Horsepower

 

Type

Size

115 Volts

200/230 Volts

 

M0

1

2

1-Phase

M1

2

3

 

M1P

3

5

Type

Size

200/230 Volts

460/575 Volts

3-Phase

M0

3

5

M1

71⁄2

10

 

290

Siemens Electrical Products and Systems

CSI Section 16160

Specification Guide