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Square D > On-line Catalog > Products > 13 Obsolescent Panelboards > QMB Fusible Panelboards: Obsolescent Branch Switch Replacement Units

Supplemental and Obsolescence Digest 174

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QMB Fusible Panelboards

Obsolescent Branch Switch Replacement Units

Class 4620

30–200 A Obsolescent Switch Units—Series D2

All Series D2 switches require that rail extension assemblies be attached to the interior side rails in order to mount the switch. These rail extension assemblies are packaged with every Series D2 switch. If a rail extension is lost or missing, contact your nearest Schneider Electric sales office to order a replacement.
Plug-on extension assemblies must also be ordered when installing 30–200 A plug-on units in blank spaces of a QW interior in the 38-inch wide box. These plug-on extension assemblies (which extend the bus) are NOT the same as the rail extension assemblies packaged with every Series D2 switch (which extend only the mounting rails).
Table 13.9:
Branch Units—Three Pole
Ampere
Rating
Obsolescent a
Series 1–4
Catalog No.
Table 13.10:
Obsolescent Circuit Breaker Units
Circuit breaker units are designed for use in all QMB interior types manufactured between 1961 and October 1984.
Table 13.11:
Plug-On Extension Assemblies
Bus extensions are required on all 30–200 A switches. They are also required on all circuit breaker units used in switchboards or in QW type panelboards with a 38‑inch wide box.
Switch Mounting Height
(inches)
4-1/2
4-1/2
7-1/2
7-1/2
Table 13.12:
Obsolescent Main Switch Units
Replace Series 4 Units
Unit Height
(inches)
Replaces Series 4
Unit Catalog No.
Table 13.13:
1-1/2
b
When this Series D2 switch is used as a replacement for a Series 1-4 3‑inch switch, a blank is also required. For a 31-inch wide box, order a QM1BL; for a 38-inch wide box, order a QW1BL. See Table 13.13, Obsolescent Blanks.
Discount Schedule

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Release Date: 03/31/2007
Modification Date: 04/08/2008