Re: Breaker / Panel Interchangability
From the UL White Book
CIRCUIT BREAKERS, MOLDED-CASE,
CLASSIFIED FOR USE IN SPECIFIED
EQUIPMENT (DIXF)
GENERAL
This category covers Classified molded-case circuit breakers rated 15 to
50 A, 120/240 V maximum that have been investigated and found suitable
for use in place of other Listed circuit breakers in specific Listed panelboards.
The circuit breakers are Classified for use in specified panelboards
in accordance with the details described on the circuit breaker or in the
publication provided therewith.
In addition, Classified molded-case circuit breakers may also be Listed with additional features such as a ground-fault trip element, ground-fault
circuit interrupter, arc-fault circuit interrupter, secondary surge arrester,
transient voltage surge suppressor, and the like.
PRODUCT MARKINGS
A circuit breaker that is Classified only is marked on the side with the
statement:
??Classified for use only in specified panelboards where the available
short-circuit current is 10 kA, 120/240 volts ac or less. Do not use in
equipment connected to circuits having an available system short-circuit
current in excess of 10 kA, 120/240 volts ac. For catalog numbers (or
equivalent) of specified panelboards, refer to Publication No.______ provided
with this circuit breaker. If additional information is necessary, contact
[Classified circuit breaker manufacturer?s name].??
A circuit breaker that is both Classified and Listed is marked on the side
with the statement:
??This circuit breaker is Listed for use in circuit breaker enclosures and
panelboards intended and marked for its use. This circuit breaker is Classified
for use, where the available short-circuit current is 10 kA, 120/240 V
ac or less, in the compatible panelboards shown in Publication No. ______
provided with this circuit breaker. When used as a Classified circuit
breaker, do not use in equipment connected to circuits having an available
system short-circuit current in excess of 10 kA, 120/240 V ac. If additional
information is necessary, contact [Classified circuit breaker manufacturer?s
name].??
The referenced publication is a compatibility list which tabulates the
company name, catalog number, number of poles and electrical ratings of
the Classified circuit breaker, in addition to the company name and catalog
number of the applicable UL Listed panelboards, and corresponding
UL Listed circuit breakers in place of which the Classified circuit breaker
has been investigated. The compatibility list also details the maximum
permissible voltage and maximum available short circuit current of the
supply system to the panelboard. The Classified circuit breaker is not suitable
for the specified application if the system supply characteristics
exceed the maximum values indicated in the compatibility list. One copy
of the compatibility list is provided with each circuit breaker.
Circuit breakers which are both Classified and Listed have markings as
above, with the addition of the Listing Mark, located on the side of the
circuit breaker.
RELATED PRODUCTS
For information on markings, see Molded-case Circuit Breakers and Circuit
Breaker Enclosures (DIVQ) and Circuit Breakers (DHJR). For those
Classified molded-case circuit breakers containing additional features,
refer to the following categories: for Arc Fault Circuit Interrupters,
Branch/Feeder Type, see AVZQ; for Circuit Breaker and Secondary Surge
Arresters, see DIMV; for Circuit Breaker and Transient Voltage Surge Suppressors,
see DIPJ; for Circuit Breakers with Equipment Ground Fault Protection,
see DIYA; for Circuit Breaker and Ground-fault Circuit Interrupters,
see DKUY.
ADDITIONAL INFORMATION
For additional information, see Circuit Breakers (DHJR) and Electrical
Equipment for Use in Ordinary Locations (AALZ).
REQUIREMENTS
The basic standards used to investigate products in this category are UL
489, ??Molded-Case Circuit Breakers, Molded-Case Switches and Circuit
Breaker Enclosures?? and UL 67, ??Panelboards.??
LOOK FOR CLASSIFICATION MARK ON PRODUCT
The Classification Mark of Underwriters Laboratories Inc. on the product
is the only method provided by UL to identify products manufactured
under its Classification and Follow-Up Service. The Classification Mark
appears on the side of the circuit breaker and consists of the words
??Underwriters Laboratories Inc. Classified Circuit Breaker?? together with
a control number. The words ??Underwriters Laboratories Inc.?? may be
abbreviated ??Underwriters Lab. Inc.?? or ??Und. Lab. Inc.??
The following mark: appears on the front, visible surface of the circuit
breaker.
