Listed and Classified: read the scope.

Quick answer

• A specified breaker is one the panel manufacturer lists for its own panel [E2 p.V1-T1-101].
• A UL Classified breaker is made by a different company and has been evaluated by UL for use in place of specified breakers. That evaluation covers only the panels named on the compatibility list supplied with the breaker, and systems up to 120/240 V with no more than 10 kA available short-circuit current [U1 items 97–99] [E2 p.V1-T1-101].
• A breaker can be both UL Classified and UL Listed [U1 item 98] [S6 PDF p.39].

1. 01

   Record the label

   Keep the complete panel identifier, breaker-type list, date and ratings together. Q7

2. 02

   Read the exact document

   Keep the maker, document revision and original page with the record. E1

3. 03

   Retain conditions and conflicts

   Record the printed limits and the panel maker’s separate statement. Q1

4. 04

   Bring the references to an electrician

   A document search does not decide what may be installed. S10

Original drawing and source annotations

The original drawing is schematic, not a product label, field measurement or installation instruction.

Open the original full-size SVG

The panel label and the electrician / authority having jurisdiction decide.

Sources: Q7 Square D 1100CT0501 pp.33-34, 60; S10 Murray 4810366 Rev. D p.1; S1 Siemens letter 2019-09-05 pp.1-2 (copy linked from the Siemens Sandy FAQ); E1 Eaton IL00304001Y p.1;

S4 Siemens QD brochure p.2; Q1 Square D FAQ FA109246; Q4 Square D 0700DB2001; C3, C7, C8, C10 CPSC notices. This chart lists documents to read; it is not installation guidance.

Three terms, defined by the documents

What UL requires on the breaker and its list

UL's marking and application guide describes three items [U1]:

• Item 97 – Classified only.
  • The side of the breaker carries a statement that it is Classified for use only in specified panelboards where the available short-circuit current is 10 kA at 120/240 V ac or less [U1 item 97].
  • The statement also refers to the publication supplied with the breaker that lists those panelboards [U1 item 97].
• Item 98 – Classified and Listed. The side marking says the breaker is Listed for enclosures and panelboards marked for its use, and Classified for the compatible panelboards in the referenced publication, within the same 10 kA / 120/240 V limit.
• Item 99 – The compatibility list. It tabulates:
  • the Classified breaker's maker, catalog numbers, poles and ratings;
  • the listed panelboards it may go in;
  • the listed breakers it replaces;
  • the maximum supply voltage and available short-circuit current [U1 item 99]. The Classified breaker is not suitable if the supply exceeds those values [U1 item 99].

In 2002 meetings with electrical inspectors, UL added two points [U2 p.16–17]:

• One copy of the compatibility list is provided with each Classified breaker. Without it, the inspector cannot determine compliance with NEC 110.3(B) [U2 p.16–17].
• At that time the lists were not online; UL's directory showed only which companies held the DIXF classification [U2 p.16–17].

Your panel label

01

Panel catalog number

02

Printed breaker types

03

Date code

Illustrative layout. No real model or rating.

Keep the label and the document together.

Catalog numbers, breaker-type lists and dates are different fields. The actual label can use a different layout.

1. Catalog number

   Record the complete identifier, including suffixes. Square D label samples, pp.33–34, 60

2. Printed breaker types

   Keep the wiring-diagram label with the box label. Murray 4810366, p.1

3. Date code

   Preserve the exact code when comparing an applicable notice. CPSC QO notice

Original drawing and source annotations

The original drawing is schematic, not a product label, field measurement or installation instruction.

Open the original full-size SVG

door of the panel" [C8]

Sources: Q7 = Square D catalog 1100CT0501 (06/2026) pp.33-34, 60 (label and wiring-diagram sample callouts); S10 = Murray/Siemens instructions 4810366 Rev. D pp.1-2; C10, C3, C8 =

CPSC recall notices (1988; 2010; 2022). The panel label and a licensed electrician decide what may be installed.

The code question: NEC 110.3(B)

• Eaton states that Classified Circuit Breakers "comply with the National Electrical Code (NEC) Section 110.3(B) Installation and Use" [E4 p.1].
• UL told inspectors that if the compatibility list is not provided with each Classified breaker, "the AHJ will not be able to determine compliance in accordance with NEC Section 110-3(B)" [U2 p.16].

Where the parties disagree

We report these positions without deciding between them. For warranty questions, ask the panel manufacturer. For code compliance, ask your AHJ.

Which Classified lines exist (in our library)

Square D says its own QO and Homeline breakers are not classified for competitors' panels [Q2] [Q3].

What UL's public database shows

• UL's public (abridged, no-login) Product iQ search for category code DIXF, run on 2026-11-15, returned five entries: four Eaton files (DIXF.E11713, E45310, E7819, E543328) and one Siemens Industry file (DIXF.E82615). UL names the category "Circuit Breakers, Molded Case, Certified for Use in Specified Equipment" [P1].
• The public profile for Eaton file DIXF.E543328 lists the model as "Classified molded case circuit breakers, Type BRS"; UL's guide information for the category requires a Product iQ account [P2].
• Siemens' general (DIVQ) listing E82615 names Types QP, QT, QD, QAF2, HQP and others as UL listed models [P3].
• Category DIUR: "Circuit Breakers, Molded Case and Circuit-breaker Enclosures for Use in Photovoltaic Systems" [P4].

Limits that apply to every Classified breaker

• 120/240 V ac or less, with available short-circuit current of 10 kA or less [U1 item 97] [E1 p.1].
• Eaton: "applications up to and including 120/240 volts, 225 ampere (A) panels" [E4 p.2].
• Eaton's list: not for series-rated systems with the listed panelboards; handle-tied breakers must be the same manufacturer and type [E1 p.1, p.4].
• Siemens QD: not series rated with Square D breakers or equipment [S6 PDF p.39].

Common confusions

• "Classified means not UL listed." UL describes breakers that are both [U1 item 98]. Siemens describes QD as "UL Classified and UL Listed" [S6 PDF p.39].
• "If it clips onto the bus, it's compatible." Classification is tied to the panel catalog numbers on the list and to the supply limits [U1 item 99].
• "Eaton CL works in Eaton BR panels too." Eaton says CL is not UL listed for BR loadcenters [K3].
• "Classified works in any panel of that brand." UL ties a Classified breaker to the panelboards named on its compatibility list [U1 item 99]; Eaton's list is organized by panel maker, with meter-center and panelboard catalog numbers [E1 pp.2–10].

FAQ

How do I know which panels a Classified breaker may go in? Read the compatibility list supplied with the breaker [U1 item 99] [U2 p.16]. Eaton publishes its CL list as IL00304001Y [E1].

Can I look it up on UL's website? Eaton says Classified listings are in UL's Product iQ database [E4 p.2]. We checked the public (no-login) version on 2026-11-15: a search for DIXF returned four Eaton files and one Siemens file [P1]. For which panels a breaker may go in, use the compatibility list supplied with the breaker [U1 item 99]. UL also gives a phone and e-mail contact for confirming a certification [P2].

Is a Classified breaker allowed by code? UL's inspector guidance ties compliance with NEC 110.3(B) to the compatibility list [U2 p.16]. Square D disputes use in its panels [Q1]. Your AHJ decides.

Does a Classified breaker void my panel warranty? Square D says the use of other manufacturers' breakers voids the UL listing and warranty of QO and Homeline load centers [Q1]; its residential warranty disclaims liability for "incompatible or UL® classified circuit breakers" [Q4]. Eaton cites the Magnuson-Moss Warranty Act [E4 p.2].

Are Classified breakers different inside? Eaton says there are no internal design differences between its Specified and Classified breakers [E4 p.1].

What is a UL Classified breaker? UL's marking guide says a Classified-only breaker is marked on the side "Classified for use only in specified panelboards where the available short-circuit current is 10 kA, 120/240 volts ac or less", and that the catalog numbers of those panelboards are in a publication provided with the breaker [U1 item 97]. A breaker can also be both Classified and Listed; its marking then covers both uses [U1 item 98].

What UL standards apply to these breakers? Eaton says its Classified breakers are tested to UL 489 (molded-case circuit breakers), UL 67SB (loadcenters and panelboards), UL 943 and UL 1699 [E4 p.2].

Sources

All documents fetched 2026-11-15 or 2026-11-16 and archived with SHA256 (see SOURCE-LIBRARY.csv). Kind: primary = issued by the manufacturer/agency; primary-mirror = manufacturer document hosted by a third party.

Related reference photographs