Siemens: start with the panel family.

Quick answer

Siemens' catalog lists Type QP, QPH and HQP breakers with 10,000, 22,000 and 65,000 A interrupting ratings [S6 PDF p.36]; Siemens' Murray cross-reference places QP / QPH / HQP in the row "Full Size (1" per Pole) with INSTA-WIRE" [S1 p.2]. UL's public Product iQ entry for Siemens (file DIVQ.E82615) lists Types QP, QT, QD, QAF2, HQP and others as UL listed models [P3]. Eaton's list IL00304001Y prints Siemens meter centers under Type CL headings [E1 p.3] and ITE/Siemens panelboards on pp.5–7, where the one Eaton type heading printed is "CLDF115, CLDF120" [E1 p.5], and its knowledge base names ITE/Siemens among the loadcenters it offers CL replacements for [K4]. Siemens' own Classified line, Type QD, goes the other way: it is for specific Square D load centers [S6 PDF p.39].

Compare a printed dimension, not an installation permission. Equal width does not establish a listed or classified combination.

Eaton CH3/4 in. per poleE5 p.5

Eaton BR1 in. per poleE5 p.5

Eaton CL1 in. per poleE12 p.103

Eaton CHQ3/4 in. per poleE5 p.8

Square D QO3/4 in. per poleQ7 p.67

Square D Homeline1 in. per poleQ7 p.67

Siemens QP1 in. per poleS9 p.1

Siemens QD3/4 in. per poleS9 p.47

GE / ABB THQL1 in. per poleG1 p.1

GE / ABB THQP1/2 in. per poleG1 p.1

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

"½" THQP"; ABB not accepting new orders as of October 2, 2024

Sources: E5 Eaton Residential Product Guide MZ00400002E p.5, p.8; K5 Eaton KB 000015509; E12 Eaton CA08100002E (2022) p.103; E1 Eaton IL00304001Y p.1; Q6 Square D 0730CT9801 p.3;

Q7 Square D 1100CT0501 pp.45, 67; S9 Siemens SPEEDFAX SF-17 pp.1, 47; S4 Siemens QD brochure p.1; G1 ABB THQP notice (June 28, 2024) p.1. The panel label governs.

Siemens compatibility table

How to read a Siemens panel label

Look for two things (diagram D1):

1. The load center catalog number, for example the G-, W- or E-prefixed numbers in Siemens' recall and catalog tables [C3] [S6 PDF p.32–34].
2. Any date code. For the 2010 recall, load-center date codes are stamped inside the metal box [C3]. For the 1986–87 I-T-E inspection program, CPSC says the load centers "can be identified by a five-digit code marked on the top of the wiring diagram label inside the door"; its example: "A product manufactured on September 24, 1986 bears the code J2486." [C10]

Then compare the catalog number against:

• Eaton IL00304001Y (Classified CL) [E1].

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.

Series and era history

Recalls and counterfeits

• 2010 spring-clip recall (CPSC recall no. 10-354).
  • About 2.2 million Siemens and Murray 15–50 A breakers, plus certain load centers and a meter combo [C3].
  • Breaker catalog numbers listed: Q115, Q120, Q130, Q215, Q230, Q250 (and Murray MP equivalents), breaker date codes 0610 or 0710 [C3].
  • Load centers and meter combo made June 23 – August 25, 2010 [C3].
  • Remedy per CPSC: contact Siemens for a free inspection by an electrician and a free replacement [C3].
• 1988 I-T-E load center inspection program (CPSC release 88-091).
  • Siemens offered free inspection and correction of certain I-T-E brand load centers installed between September 1986 and May 1987, because some were made with components of an incorrect material that could cause overheating and malfunction [C10].
  • Date codes involved: H2586–H3186, J0186–J3086 and K0186–K2486, marked at the top of the wiring diagram label [C10].
  • CPSC says a label stamped "inspected lugs" means the load center has already been inspected and corrected if necessary [C10].
• 1998 GFCI recall. About 144,000 Siemens- or Murray-branded 2-pole GFCI breakers, typically used with hot tubs and spas [C4].
• Counterfeits. U.S. Immigration and Customs Enforcement (ICE) reported counterfeit breakers bearing marks including Siemens [O2].

Common confusions

• "Siemens makes a breaker for every brand." The SPEEDFAX catalog describes Siemens QD and Murray MSQ as UL Classified for specific Square D load centers in place of QO [S6 PDF p.39, p.61].
• "QP and QD are the same, just different sizes."
  • QD is a ¾-inch format, UL Classified for specific Square D load centers in place of QO [S6 PDF p.39].
  • QP / QPH / HQP sit in the cross-reference row "Full Size (1" per Pole) with INSTA-WIRE" [S1 p.2].
• "Eaton BR is a Siemens replacement." Eaton's line for ITE/Siemens panels is CL, and only for panels on its list [E1] [E3 p.3] [K4].

FAQ

Can I put a Square D breaker in a Siemens panel? Square D states its QO breakers are only UL tested and approved for QO, NQO, NQOD and NQ panelboards [Q3], and that Homeline breakers are not classified for competitors' load centers [Q2].

Will Eaton breakers work in a Siemens panel? Eaton's IL00304001Y prints Siemens meter centers under Type CL headings [E1 p.3] and ITE/Siemens panelboards on pp.5–7; the Eaton type heading printed there is "CLDF115, CLDF120" [E1 p.5]. The limits are 120/240 V and 10 kA [E1 p.1], and the list must not be used for series-rated systems [E1 p.4].

Are Siemens and Murray breakers the same? Siemens says Siemens and Murray meter combos, EQ Small Circuit load centers and breakers are "typically identical in construction and only differ in labeling" [S2 p.1]. Use in a given panel still follows the label and the January 2002 letter [S1 p.1].

What does Non-CTL mean on a Siemens breaker? Siemens' catalog footnote says Non-CTL breakers are for replacement use only in panels manufactured before 1968 [S6 PDF p.37]. Eaton's catalog explains the background. It says: "National Electrical Code Paragraph 384.15 requires branch circuit panelboards to be provided with physical means to prevent the installation of more overcurrent devices than that number of which the enclosure was designed, rated and approved." [E12 p.V1-T1-91] Eaton's Class CTL duplex, quadplex and twin breakers carry a UL listed rejection tab, and versions made without the tab are "available for replacement purposes in older interiors" [E12 p.V1-T1-91]. Eaton describes its own Non-CTL BRD breakers as "For replacement in enclosures manufactured prior to 1968 with unnotched stabs" [E12 p.V1-T1-78]. This is Eaton's wording.

What is a Siemens QD breaker? A ¾-inch breaker, UL Classified and UL Listed, for use in place of Square D QO breakers in the Square D load centers on its Panelboard Compatibility List [S6 PDF p.39].

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.