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AC Controls
Full Voltage, Non-Reversing Starters (NEMA Sizes 6-8)
NEMA Size 6-8, Class SXL, Full Voltage,
Non-Reversing Starters
Full Voltage Starters
3-Phase 250 to 900 HP, Non-Reversing
and Reversing 50 / 60 Hz., NEMA Sizes
6–8 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. UL
Listed and CSA Certified.
Overload Protection
Siemens solid-state overload relay protec-
tion is provided standard for starter sizes
6 through 8. Improvements in motor
designs and manufacturing capabilities
have resulted in decreasing physical
motor size to obtain the same horse-
power, making them more sensitive to
overloads. Previous motors had a higher
tolerance for overloads and made applica-
tion of electromechanical overload relays
satisfactory for protection. The bigger the
motor, the more there is riding on mar-
ginal protection and high rewind costs.
15
304
Features
½ Ambient Compensation from –25°C to
+55°C.
½ Wide Adjustable Current Tripping
Range.
½ Detection of Overload, Phase Loss
and Phase Unbalance.
½ Isolated Contacts, 1-Normally Closed
and 1-Normally Open Alarm Circuit
Contact.
½ Reset Button with Trip-Free Feature.
½ Clear Plastic Sealable Cover to
Prevent Unauthorized Tampering.
½ UL Listed and CSA Certified.
Starter Types
SXL: Full Voltage, across the line Non-
Reversing
SRL: Full Voltage, across the line
Reversing
SCN: Full Voltage, across the line Non-
Reversing, combination Non-
Fusible
SCF: Full Voltage, across the line Non-
Reversing, combination Fusible
SCB: Full Voltage, across the line Non-
Reversing, combination Circuit
Breaker
Note:Class designation revision (effec-
tive late 1994) does not affect
starter designs.
New
Old
SXL =
XL
SRL =
XR
SCN =
XLN
SCF =
XLF
SCB =
XLB
Enclosures
Construction is all welded, with an elec-
trostatically applied powder epoxy baked
finish, in ANSI-61 light gray.
Type 1:
General Purpose
Type 3R: Outdoor Raintight
Type 12: Dusttight — Industrial Use
Type 4:
Watertight Painted Sheet
Steel
Siemens Electrical Products and Systems
Specification Guide
General / Dimensions
Ratings
Table 15.31 FVNR Starter Ratings
Maximum 3-Phase HP Ratings
at Motor Voltages
NEMA
Size
200V
230V
460V
6
200
400
7
150
300
600
8
450
900
Dimensions
Table 15.32
Non-Reversing and
Reversing Starters
Starter
Dimensions in inches (mm)
NEMA
Size
Type
A
B
Non-Reversing Starter
Class: SXL, SCN, SCF, SCB
Without
6
76 (1930)
30 (762)
Short
7
90 (2286)
30 (762)
Circuit
8
*
*
Protection
With
6
76 (1930)
30 (762)
Fusible
7
90 (2286)
30 (762)
Disconnect
8
*
*
With
6
76 (1930)
30 (762)
Molded
7
90 (2286)
30 (762)
Case
8
*
*
Breaker
Reversing Starter Class: SRL
Without
6
90 (2286)
30 (762)
Short
7
90 (2286)
30 (762)
Circuit
8
90 (2286)
44 (1118)
Protection
CSI Section 16160
575V
400
600
900
C
24 (610)
24 (610)
*
24 (610)
24 (610)
*
24 (610)
24 (610)
*
24 (610)
24 (610)
40 (1016)
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