Branch Switch Replacement
Class 4620
Guidelines
STEP 1: Determine the panelboard interior type. If the date of manufacture is not known, compare your switch with the pictures below to determine the mounting rail direction. Only mounting rails that face outward will accept the Series D2 switch and its required mounting rail extension bracket.
STEP 2: Order a replacement switch from 30–200 A Obsolescent Switch Units—Series D2.
Panelboard Interiors
|
Illustration No. |
Interior Catalog No. Prefix |
Designed For Switch Type |
Switch Availability/Order Information |
|---|---|---|---|
|
1 |
Type QM |
Series 1-4 |
NOT
AVAILABLE |
|
2 |
Type QM |
Series 1-4 |
NOT
AVAILABLE |
|
Series D2 |
Order Series D2 switch from 30–200 A Obsolescent Switch Units—Series D2. (Many still stocked in DS.) |
||
|
3 |
Type QW |
Series 1-4 |
NOT
AVAILABLE |
|
Series 1-4 |
NOT
AVAILABLE |
||
|
Series D2 |
Order Series D2 switch and plug-on extension assembly from 30–200 A Obsolescent Switch Units—Series D2. |
||
|
4 |
Type
QMB |
Series
E1 or E2 |
Order from Digest Section 9. |
|
Type QM (31-inch Wide) |
Type QM (31-inch Wide) |
|
|
Panelboards manufactured before 1961 have the interior mounting rails facing inward (toward the bus). Switches and circuit breakers that fit in this interior type are obsolete. |
Panelboards manufactured after 1961 have the interior mounting rails facing outward (away from the bus). This interior accepts Series 1-4 switches and Series D2 switches (shown above with required rail extensions). Order the Series D2 switch (includes mounting rail extensions) from 30–200 A Obsolescent Switch Units—Series D2. |
|
|
Type QW (38-inch Wide) |
Type QMB |
|
|
Type QW panelboards were built to accept bolt-on 400 A and 600 A Series 1-4 switches. 30-200 A Series D2 switches may be installed as shown using the plug-on extension assembly from 30–200 A Obsolescent Switch Units—Series D2. |
Series E1 panelboards will accept only Series E1 or E2 switches. Order from Digest Section 9. |