Eaton Tandem Circuit Breakers Marked “For Replacement Only”
The purpose of this memo is to inform Inspections Departments and Electrical Contractors of
the Office of State Fire Marshal’s acceptance of Eaton tandem breakers, also commonly
referred to as half-size breakers, in new installations.
The 2014 Underwriters Laboratories (UL) Marking and Application Guide for Molded Case
Circuit Breakers:
42. For Replacement Not CTL — The marking “For replacement use only not CTL assemblies”
appears on breakers that do not have means to prevent their installation in Class CTL
assemblies. These breakers are intended for replacement in older assemblies still in service,
which pre-dates the Class CTL requirements for circuit breakers and panelboards.
As stated in the UL procedure for Eaton concerning the BR Duplex: Class CTL - Types BA, BR,
BRH, HQP, QC, QPH, QPHW, QBH/QBHW, QCHW, QPD, BRD and QPQ, may be marked "CTL."
The UL 489 standard does not require this marking.
Eaton has made a formal request to UL for the removal of such marking. UL’s acceptance
concerning the formal removal of the marking is an administrative technicality and has no
engineering basis. Therefore, tandem circuit breakers marked “THIS BREAKER IS NON-CTL AND
IS FOR REPLACEMENT USE ONLY” shall be accepted in new installations until UL has formally
removed the marking.
Joseph Daniel Starling
Chief State Electrical Engineer & Inspector
Chief Electrical Code Consultant