HP Class SMF, MMS and MRS, Type F02 manual Full Voltage, Non-Reversing Starters Nema Sizes, Ratings

AC Controls

Full Voltage, Non-Reversing Starters (NEMA Sizes 6-8)

General / Dimensions

15

AC Controls

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.

Features

JAmbient Compensation from –25°C to +55°C.

JWide Adjustable Current Tripping Range.

JDetection of Overload, Phase Loss and Phase Unbalance.

JIsolated Contacts, 1-Normally Closed and 1-Normally Open Alarm Circuit Contact.

JReset Button with Trip-Free Feature.

JClear Plastic Sealable Cover to Prevent Unauthorized Tampering.

JUL 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

Ratings

Table 15.31 FVNR Starter Ratings

	Maximum 3-Phase HP Ratings
NEMA	at Motor Voltages
Size	200V	230V	460V	575V
6		200	400	400
7	150	300	600	600
8		450	900	900

Dimensions

Table 15.32 Non-Reversing and Reversing Starters

Starter		Dimensions in inches (mm)
NEMA
Size	Type	A	B	C
Non-Reversing Starter
Class: SXL, SCN, SCF, SCB
6	Without	76 (1930)	30 (762)	24 (610)
	Short
7		90 (2286)	30 (762)	24 (610)
	Circuit
8	Protection	*	*	*
6	With	76 (1930)	30 (762)	24 (610)
	Fusible
7		90 (2286)	30 (762)	24 (610)
	Disconnect
8		*	*	*
6	With	76 (1930)	30 (762)	24 (610)
	Molded
7		90 (2286)	30 (762)	24 (610)
	Case
8	Breaker	*	*	*
Reversing Starter Class: SRL
6	Without	90 (2286)	30 (762)	24 (610)
	Short
7		90 (2286)	30 (762)	24 (610)
	Circuit
8	Protection	90 (2286)	44 (1118)	40 (1016)

304	Siemens Electrical Products and Systems	CSI Section 16160
	Specification Guide