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AC Controls
Guide Form Specifications
3-Phase Manual Starters and
1-Phase Starters
All 3-Phase manual starters and single-
phase starters rated above 1 HP shall be
Siemens Class 11. They shall meet or
exceed the requirements of NEMA, UL,
and CSA. The starter must feature quick-
make and quick-break contact operation
and cannot be teased into open condition.
It shall be provided with Class 20 melting
alloy overload protection, have optional
low voltage protection, padlock capability,
and be available in open, NEMA 1, 3, 4, 7
& 9, and 12 enclosures. Operating mech-
anism must clearly show their position
whether unit is on, off, or tripped.
Combination Starters,
NEMA Size 0–5
Across-the-line non-reversing or reversing
combination starters for motors up to
200 HP, 460 volts shall be Type SCB
(motor circuit interrupter Type ETI), Type
SCF (fusible disconnect switch Type
MCS), or Type SCN (non-fusible discon-
nect switch, Type MCS). They shall be
built in accordance with the latest NEMA
IC52 standards and shall be UL Listed.
The Type SCB and SCF shall be UL
Listed for applications requiring up to
100,000 amps withstand ratings without
the addition of current limiters. Class
"R"fuse clips to be supplied as standard.
Starters shall be equipped with three
pole double break contactor with arc
quenching system consisting of arc
chutes with arc splitter plates and a
maximum contact bounce time of 2 milli-
seconds for extended contact life. The
contactor shall have a minimum locked
rotor rating of 840% FLA for 10 seconds
duration. Starter shall include a minimum
of two normally open and two normally
closed contacts as standard (one open
and one closed on reversers).
Starters shall be equipped with three-pole
overload relays. Overload relay shall be
block-type NEMA Class 20 with a test fea-
ture. An isolated field mountable alarm
contact should be available. An optional
Class 10 overload relay should also be
available for factory or field installation.
The combination starter operating handle
shall always remain connected to the
breaker or switch. The operating handle
shall not be mounted in the door of the
enclosure, but to the side of the door in
the enclosure flange for safe "stand
aside" operation. Position of operating
handle will indicate "on, off, or tripped"
condition of switch or circuit breaker.
CSI Section 16160
Interlock provisions shall prevent unau-
thorized opening or closing of the starter
door with the disconnect in the "on"
position. Operating handle shall be suit-
able for padlocking in the "off" position.
Type SXL and SRL
Non-Reversing or Reversing
Starters
Across-the-line magnetic starters for
motors up to 200 HP, 600 volts, shall be
Siemens Class 14 starters or equal. They
shall be built and tested in accordance
with the latest NEMA Standard ICS2-321
and UL Listed.
Starters shall be equipped with three-
pole, double-break contactors 45° wedge
action cross arm design utilized to mini-
mize arcing contact bounce. Half-sized
for specific HP ratings between NEMA
sizes should be available for space and
cost savings. Coils should snap in and
out for ease of inspection and changing.
Dual voltage coils shall be optional.
Starter shall include one normally open
auxiliary contact as standard with capabil-
ity of mounting at least 3 additional.
Starters shall be equipped with three-
pole overload relays. Overload relay shall
be melting alloy-type NEMA Class 20
with a test feature. An isolated field
mountable alarm contact should be avail-
able. Optional Class 10 overload relay
should also be available for factory or
field installation.
Full Voltage Starters,
NEMA Size 6–8
Across-the-line reversing and non-
reversing starters for motors rated above
100 HP at 230 volts, and above 200 HP
at 460 volts. Starters shall be equipped
with three-pole double-break contactors
with an arc quenching system consisting
of arc chutes with arc splitter plates and
a limited contact bounce to extended
contact life. Starter shall include a control
transformer as standard. Starter shall also
include a solid state microprocessor con-
trolled overload relay with three current
transformers and shall have an adjustable
tripping class from Class 10 to Class 30
to compensate for long acceleration
times. The overload relay shall offer pro-
tection from overloads, phase loss, and
phase unbalance, and also include an iso-
lated alarm circuit contact and test but-
ton. The starters shall be built and tested
in accordance with the latest NEMA
standard ICS 2-321 and UL Listed.
All starter enclosure types are fabricated
types, in accordance with the latest
Siemens Electrical Products and Systems
Specification Guide
Specifications
NEMA standards. All operating parts
can be removed quickly and easily from
the front.
Devices shall have straight through
wiring and conveniently located connec-
tion points for external wires and cables
minimize installation time. Combination
starters shall be of either the fusible
switch, non-fusible switch, or molded
case circuit breaker type. Combination
fusible starters shall contain fuse clips for
Class L current limiting fuses rated
200,000 amps symmetrical interrupting
capacity, and shall have an externally
operated load break disconnect switch.
On the combination circuit breaker ver-
sion, a molded case thermal magnetic
circuit breaker which has an adjustable
magnetic trip provision, shall be provided.
Reversing starters will contain two con-
tactors that are electrically and mechani-
cally interlocked in addition to all the
above described features. 3-phase, 250 to
900 HP non-reversing and reversing
50 / 60 Hz. NEMA size 6 through 8 full-
voltage starters are used for across-the-
line starting of squirrel cage induction
motors and the primary control functions
for wound rotor motors. In addition they
can be used for control of power for
static or resistive loads such as lighting
and heating. They provide the lowest
cost, least maintenance and minimum
space requirements of any magnetic
starters where inrush current limitations
do not restrict their use.
Starter Types
Non-Reversing
Class 18 Motor Circuit Interrupter (ETI)
Class 17 Fusible Switch (MCS)
Class 17 Non-Fusible Switch (MCS)
Reversing
Class 26 Motor Circuit Interrupter (ETI)
Class 25 Fusible Switch (MCS)
Class 27 Non-Fusible Switch (MCS)
Additional Starter Sizes
Oversize enclosures are available:
Class 17 and 18, NEMA sizes 0–4.
15
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