What is the QMB branch switch replacement criteria?

Issue:
QMB branch switch information

Product Line:
QMB fused switches

Environment:
QMB Branch switches


Cause:
Selection criteria

Resolution:

Type QW (38-inch Wide) Manufactured Before 1984

• 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 using the plug-on extension assembly.

Type QM (31-inch Wide) Manufactured Before 1961

• 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.

Type QM (31-inch Wide) Manufactured After 1961 But Before October 1984

• 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).

Type QMB Manufactured After October 1984

• Series E1 panelboards will accept only Series E1 or E2 switches.

Released for: Schneider Electric USA