Class SMF
Class SMF fractional horsepower
starters provide overload protection as
well as manual ON / OFF control for
small motors in a variety of industrial
and commercial installations.
Available in one or two pole versions,
these devices are suitable for use with
AC single phase motors to 1 HP. Two
pole starters can also be used with DC
motors to
3
⁄
4
HP. Typical applications
include fans, conveyors, pumps, and
small machine tools. The continuous
current rating is 16 amperes.
Overload trip assembly motor protection
is provided by a Type SMFH thermal
heater element which must be installed
before the starter will operate.
Two-Speed Class SMF manual starters
are designed for control of small single
phase AC motors having separate wind-
ings for high and low speed operation.
Two toggle operated starters are used,
with overload protection included for
each motor winding. Surface mounting
devices, and those with a gray flush
plate, utilize a mechanical interlock
which allows direct control of the motor
by means of the toggle operators.
Class MMS and MRS
These motor starting switches provide
manual ON / OFF control of single or
three-phase AC motors, where overload
protection is not required, or is provided
separately.
These devices are suitable for use with
AC three-phase motors up to 10 HP.
Compact construction and a 600 volt
rating make these switches suitable for
a wide range of industrial and commer-
cial uses. Typical applications include
small machine tools, pumps, fans, con-
veyors, and many other types of electri-
cal machinery. They can also be used
on non-motor loads such as resistance
heaters.
The continuous current rating is 30
amperes at 250 volts max., 26.4 am-
peres at 277 volts max., 20 amperes
at 600 volts max, 30 ampere resistive
at 600 volts max.
Class MMS, two-speed manual switch-
es may be used with separate winding,
three-phase or single-phase AC motors
where overload protection is not
required, or is provided separately. Two
switches are employed to give ON /
OFF control in each speed.
Class MRS, reversing manual switches
provide a compact means of starting,
stopping and reversing AC motors where
overload protection is not required, or is
provided separately. They are suitable for
use with three-phase squirrel cage
motors, and for single-phase motors
which can be reversed by reconnecting
motor leads. Two switches are used, one
to connect the motor for forward rota-
tion, and one for reverse.
Class SMF, MMS and MRS
NEMA Type 1 surface mounting enclo-
sures are sheet steel with a thermoplas-
tic wrap-around cover for convenience
in wiring. The NEMA Type 1 enclosure
is also available in oversized and jumbo
versions allowing more wiring space. A
zinc alloy die casting or non-metallic
enclosure is used for NEMA Type 4
enclosures. NEMA 7 & 9 enclosures are
supplied as standard with provisions for
locking in the ON or OFF position.
Standard red or non-standard green
neon pilot light units are available facto-
ry installed in NEMA Type 1 surface and
flush mounting, and NEMA Type 4
enclosures, or as a field modification kit
for NEMA Type 1 enclosures and gray
flush plates.
An “Emergency-OFF” toggle operator
extender is available for NEMA Type 1
surface mounted units. The extender
has a red vinyl button that provides a
fast and easy method for locating and
switching the device’s toggle operator
into the OFF position. The Emergency
OFF Actuator is available in kit form
only for field installation.
An optional Handle Guard / Lock-OFF on
NEMA Type 1 enclosed starters pre-
vents accidental operation of the toggle
and also allows the toggle operator to
be padlocked in either the ON or the
OFF position. This handle guard can be
factory installed on NEMA Type 1
enclosed starters and is also available in
kit form for field installation on NEMA
Type 1 surface and flush mounting
enclosures. Standard NEMA Type 4
metallic enclosures include provision for
padlocking in the OFF position.
AC Controls
Manual Starters and Switches
285
CSI Section 16160
Siemens Electrical Products and Systems
Specification Guide
AC
Controls
15
General
Type F02
Type K02
Typical Wiring Diagrams
Class SMF
Class MMS
1 Pole
2 Pole
2 Pole with
Selection Switch
2 Pole –– 1 Phase
3 Pole –– 3 Phase
