AC Controls
Manual Starters and Switches
General
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| Class MMS and MRS |
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| These motor starting switches provide |
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| manual ON / OFF control of single or |
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| protection is not required, or is provided |
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| separately. |
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| These devices are suitable for use with |
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| AC |
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| Compact construction and a 600 volt |
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| rating make these switches suitable for |
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Type F02 | a wide range of industrial and commer- | Type K02 | ||||
cial uses. Typical applications include | ||||||
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Class SMF | small machine tools, pumps, fans, con- | versions allowing more wiring space. A | ||||
Class SMF fractional horsepower | veyors, and many other types of electri- | zinc alloy die casting or | ||||
starters provide overload protection as | cal machinery. They can also be used | enclosure is used for NEMA Type 4 | ||||
well as manual ON / OFF control for | on | enclosures. NEMA 7 & 9 enclosures are | ||||
small motors in a variety of industrial | heaters. | supplied as standard with provisions for | ||||
and commercial installations. | The continuous current rating is 30 | locking in the ON or OFF position. | ||||
Available in one or two pole versions, | amperes at 250 volts max., 26.4 am- | Standard red or | ||||
these devices are suitable for use with | peres at 277 volts max., 20 amperes | neon pilot light units are available facto- | ||||
AC single phase motors to 1 HP. Two | at 600 volts max, 30 ampere resistive | ry installed in NEMA Type 1 surface and | ||||
pole starters can also be used with DC | at 600 volts max. | flush mounting, and NEMA Type 4 | ||||
motors to 3⁄ HP. Typical applications | Class MMS, | enclosures, or as a field modification kit | ||||
4 |
| for NEMA Type 1 enclosures and gray | ||||
include fans, conveyors, pumps, and | es may be used with separate winding, | |||||
small machine tools. The continuous | flush plates. | |||||
current rating is 16 amperes. | where overload protection is not | An | ||||
Overload trip assembly motor protection | required, or is provided separately. Two | extender is available for NEMA Type 1 | ||||
is provided by a Type SMFH thermal | switches are employed to give ON / | surface mounted units. The extender | ||||
heater element which must be installed | OFF control in each speed. | has a red vinyl button that provides a | ||||
before the starter will operate. | Class MRS, reversing manual switches | fast and easy method for locating and | ||||
provide a compact means of starting, | switching the device’s toggle operator | |||||
are designed for control of small single | stopping and reversing AC motors where | into the OFF position. The Emergency | ||||
phase AC motors having separate wind- | overload protection is not required, or is | OFF Actuator is available in kit form | ||||
ings for high and low speed operation. | provided separately. They are suitable for | only for field installation. | ||||
Two toggle operated starters are used, | use with | An optional Handle Guard / | ||||
with overload protection included for | motors, and for | NEMA Type 1 enclosed starters pre- | ||||
each motor winding. Surface mounting | which can be reversed by reconnecting | vents accidental operation of the toggle | ||||
devices, and those with a gray flush | motor leads. Two switches are used, one | and also allows the toggle operator to | ||||
plate, utilize a mechanical interlock | to connect the motor for forward rota- | be padlocked in either the ON or the | ||||
which allows direct control of the motor | tion, and one for reverse. | OFF position. This handle guard can be | ||||
by means of the toggle operators. | Class SMF, MMS and MRS | factory installed on NEMA Type 1 | ||||
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| enclosed starters and is also available in | ||||
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| NEMA Type 1 surface mounting enclo- | ||||
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| kit form for field installation on NEMA | ||||
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| sures are sheet steel with a thermoplas- | ||||
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| Type 1 surface and flush mounting | ||||
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| tic | ||||
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| enclosures. Standard NEMA Type 4 | ||||
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| in wiring. The NEMA Type 1 enclosure | ||||
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| metallic enclosures include provision for | ||||
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| is also available in oversized and jumbo | ||||
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| padlocking in the OFF position. | ||||
Typical Wiring Diagrams |
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Class SMF | Class MMS |
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1 Pole | 2 Pole | 2 Pole with | 2 Pole | 3 Pole |
Selection Switch |
15
Controls AC
CSI Section 16160 | Siemens Electrical Products and Systems | 285 |
| Specification Guide |
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