Square D Digest 179

NEMA 3R, 4, 4X, and 12

Separate Enclosures

Class 9991 / Refer to Catalog 9999CT9701

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Separate Enclosures, Class 9991

Separate enclosures can be used with open style devices for field assembly of enclosed controls. These enclosures, plus the open style components, are equivalent to a factory assembled device. Separate enclosures are for use only with the following equipment: • NEMA 4 and 12 Class 9991 separate enclosures for Type S devices come standard with closing plates. See Table 16.294 for the specific number of closing plates. For applications requiring enclosures without closing plates, contact your nearest Schneider Electric sales office. • NEMA3R enclosures for field assembly of equipment for outdoor applications come with three closing plates, a reset mechanism, and a predrilled panel as standard. For a conduit connection to the top of these enclosures, select watertight hubs from the listing on Digest page 3-10 in accordance with applicable code requirements. Square D NEMA 12 enclosures can also be modified for outdoor use. For details, refer to the NEMA 12 enclosure modification information on page page 16-113. NOTE : Not for use in high-corrosive outdoor locations or sea coast environments. • NEMA4X enclosures for Type S devices, Sizes 0–2 and 30–60 A, come standard without closing plates. Cover mounted control units for NEMA 4X separate enclosures are available as a factory modification only. When closing plates are removed from NEMA 4, 12, and 3R enclosure covers, the openings can be used for easy installation of Class 9001 Type K or SK cover-mounted control units. Convenient Class 9999 modification kits containing Class 9001 Type K control kits can be found on page page 16-128. Table 16.293: How to Order To Order Specify: Catalog Number

NEMA 4X Enclosure

NEMA 12 Enclosure

16 NEMA AND DEFINITE PURPOSE CONTACTORS AND STARTERS

• Class Number • Type Number

Type

Class 9991

—

TypeSCH2 NEMA 3R Enclosure

NEMA 4 Enclosure

Table 16.294: Selection, Class 9991

Enclosure Classification

NEMA4X Watertight, Dusttight and Corrosion-Resistant Glass-Polyester

NEMA3R Rainproof, Sleet Resistant, Outdoor Use

NEMA4 [1] Watertight and Dusttight Stainless Steel

NEMA Size or Ampere Rating

For Use With

NEMA12/3R Dusttight and Driptight

Number of Closing Plates

Numberof Closing Plates

Types (All Pole Arrangements)

Type

Type

Type

Type

Class

Manual Starters 2510 [2]

MO M1 M1P

MBO,MCO

—

—

—

—

—

—

Magnetic Contactors

SAO, SBO, SCO

00, 0, 1

SCW20 SDW20

—

2 2 3 3 2 2 3 3 2 2 2 3

—

2 2 3 3 2 2 3 3 2 2 2 3

SCH2 SDH1 SEH1

SDA11 [4]

SDO SEO SFO

2 3 4

SDW11 SEW11 SFW11

8502 [3]

— —

— —

—

Magnetic Starters

SAO, SBO, SCO

00, 0, 1

— — — —

—

—

SCH2 SDH1 SEH1

SDA11 [4]

SDO SEO SFO

2 3 4

SDW11

8536

SEW11 [5] SFW11 [5]

— —

—

Lighting Contactors, Non-Combination, Electrically and Mechanically Held

SDA11 [4]

LO, LXO

20A 30A 60A

SDW20

SDW11

SDH1 SCH2 SDH1 SEH1

SCW20 [6] SCW20 [6]

SMO SPO SQO SVO

—

—

8903 [3]

SDA11 [4]

SDW11

SEW11 [5]

100A 200A

— —

— —

—

—

—

—

Reversing and Two-Speed, Horizontally Arranged Contactors and Starters 8702 [3] 8736 SBO, SCO SDO 0, 1 2 —

— SDA12 [4]

SCW12 SDW12 SCW13

— — —

3 3

3 3

0, 1

8810

SBO&SCO

—

—

The standard cabinet has a brushed finish.

[1] [2]

Type MBO, Size MO only.

[3] For contactors, replace the reset assembly with a proper closing plate: for NEMA 4, use Class 9001 Type K52; for NEMA 3R and 12, use Class 9001 Type K51. (Class 9991 Types SCW20 and SDW20 are designed for contactors only, so reset closing plates are not required.) [4] NEMA 12 enclosures can be field modified for outdoor non-corrosive and non–service entrance rated applications. See page 16-113 for more information. [5] This enclosure is suitable only for starters with a melting alloy , solid-state , or adapted bimetallic overload relay. [6] For electrically held devices only.

16-111

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