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Square D Breakers

Schneider Electric makes Square D circuit breakers that are renowned for their reliability, sophisticated design, and many uses. They are deployed in residential, commercial, and industrial situations to provide vital protection against a variety of electrical hazards—overcurrents of all types (phase, neutral, earth), short-circuited phases, and certain types of ground faults.

For industrial and commercial applications, Square D offers the reliable PowerPact series of molded case circuit breakers (MCCBs). Engineered to handle higher current loads than typical residential-types, these circuit breakers are built to withstand whatever demand your operation can dish out. Their advanced protection features—part and parcel to many modern load-break devices—make them much safer and more reliable than those older electromechanical relays you might find in an M Loop on a very old control panel.

Among residential circuit breakers, the QO and Homeline series from Square D are some of the most popular. The QO series stands out for its "innovative quick response feature," which swiftly detects when a circuit is in need of protection. And if one does trip, you can see that it did; the physical signs really don't lie! They visually show up as an open breaker (which doesn't carry any electricity) with push-in indicators associated with each pole/circuit .

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Manufacturer
Schneider Electric (4707)
Square D (4707)
Component
Enclosed Circuit Breaker (1)
Miniature Circuit Breaker (2048)
Molded Case Circuit Breaker (2587)
Residual Current Breaker (1)
Amperage (Molded Case Breaker)
100 Amp (186)
1000 Amp (46)
110 Amp (48)
1200 Amp (64)
125 Amp (115)
15 Amp (94)
150 Amp (178)
1600 Amp (16)
175 Amp (71)
20 Amp (104)
Breaker Voltage Rating
110 VDC (1)
12 VAC (2)
12 VDC (7)
120 VAC (669)
120 VAC 240 VAC (1)
120 VDC (78)
120/240 VAC (166)
120/240 VAC 120 VAC (5)
120/240 VAC 120 VAC 48 V DC (17)
120/240 VAC 240 VAC 120 VAC (2)
Breaker Amperage Rating
1 Amp (1)
10 Amp (16)
100 Amp (43)
110 Amp (15)
125 Amp (22)
15 Amp (114)
150 Amp (7)
16 Amp (3)
175 Amp (4)
2 Amp (1)
Maximum Voltage (Molded Case Breaker)
120 VAC (22)
208 VAC (9)
240 VAC (427)
240 VDC (10)
250 VDC (522)
277 VAC (53)
347 VAC (6)
415 VAC (2)
480 VAC (60)
480/277 VAC (10)
Breaker Number of Poles
Single Pole (577)
Two Pole (839)
Three Pole (617)
Four Pole (71)
Interrupt Rating (Molded Case Breaker)
10 Ka (19)
10 Ka 125 Volt (38)
10 Ka 240 Volt (84)
10 Ka 250 Volt (93)
10 Ka 600/347 Volt (57)
10 Ka 600Y/347 Volt (26)
100 Ka (82)
100 Ka 208Y/120 Volt (47)
100 Ka 240 Volt (499)
100 Ka 480 Volt (104)
Breaker Trip Speed
Very Fast Trip (19)
Fast Trip (66)
Normal Trip (302)
Slow Trip (167)
Poles (Molded Case Breaker)
Four Pole (20)
Single Pole (133)
Three Pole (1719)
Two Pole (697)
Line
HOM (95)
QO (457)
QOU (132)
QOUQ (8)
QOUR (28)
QQ (136)
Breaker Mechanism Type
Toggle (541)
Breaker Mount Type
Bolt-On (324)
Din Rail (555)
Plug-In (384)
Unit Mount (1)
Breaker Overcurrent Protection Rating
B Curve 3.2-4.8 X Amp Rating (66)
C Curve 7-10 X Amp Rating (302)
D Curve 10-14 X Amp Rating (167)
Z Curve 2.4-3.6 X Amp Rating (19)
Breaker Protection For
High Inrush Current (167)
Sensitive Equipment (66)
Ultra Sensitive Equipment (19)
Breaker Switching Type
Thermomagnetic (541)
Breaker Type
Branch Circuit Breaker (194)
Supplementary Breaker (235)
Breaker UL Rating
Non UL Breaker (112)
UL 1077 Recognized (235)
UL 489 Listed (194)
Breaker Unit
Complete Unit (541)
Frame Type (Molded Case Breaker)
B Frame (337)
E Frame (16)
H Frame (564)
J Frame (242)
L Frame (124)
LA Frame (40)
LH Frame (15)
M Frame (57)
P Frame (138)
Q Frame (282)
Interrupt Code (Molded Case Breaker)
B Interrupt Rating (84)
D Interrupt Rating (492)
G Interrupt Rating (570)
J Interrupt Rating (500)
K Interrupt Rating (8)
L Interrupt Rating (109)
R Interrupt Rating (15)
Mounting (Molded Case Breaker)
Busbar (52)
DIN Rail (76)
I-Line (841)
Plug-In (1)
Unit Mount (922)
Number of Jaws
13 (1)
4 (26)
4 Without Jaw Release (8)
5 (5)
7 (2)
Number of Meter Sockets
2 (1)
3 (1)
4 (1)
6 (1)
Number of Spaces
10 (2)
12 (6)
16 (5)
20 (12)
3 (1)
30 (12)
4 (12)
42 (6)
54 (3)
60 (1)
Phase
Single Phase (63)
Three Phase (6)
UL Listing (Molded Case Breaker)
UL 489 (1496)
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$42.64
$35.53
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$35.53
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$35.53
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$42.64
$35.53
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$99.51
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More Information about Square D Breakers

Another popular line of residential circuit breakers is the Homeline series. Like the QO series, these breakers are also used frequently for their dependability and affordability. The features of a Homeline breaker are very similar to those found in a QO breaker but at an about-half-the-price rate. They’re suitable for new homes, home renovations, and buildings undergoing remodeling or construction.

The Square D range also includes specialty breakers, such as arc fault circuit interrupters (AFCIs) and ground fault circuit interrupters (GFCIs). AFCIs are designed to protect against electrical fires. They work by detecting the kind of sudden increase in current associated with an arc fault. GFCIs work by protecting against ground faults—a common cause of electrocution. Both types of breakers are available from Square D.

FAQs

Where can customers purchase or access Square D parts and products?

Customers can purchase or access Square D parts and products through distributors such as RSP Supply.

Is a Schneider circuit breaker the same as a Square D circuit breaker?

No, a Schneider circuit breaker and a Square D circuit breaker are not exactly the same, but Square D is a brand owned by Schneider Electric, meaning Square D breakers are part of Schneider's product line, primarily used in North America with specific designs and standards.

Breakers vs Fuses 

Fuses

Fuses are safety devices that are intended to provide protection to both equipment and people in the event of a power surge or an overcurrent situation. A fuse can provide this protection by using a small piece of wire that is sacrificial, and is intended to burn up when too much current is passed through it. When this happens, the fuse eliminates the flow of electricity in that circuit until it is replaced. The size and type of wire that is used in the fuse will dictate how much current can pass through that individual fuse. So the main thing to remember is, when a fuse blows, it must be replaced and cannot be reused. 

Circuit breakers

Circuit breakers are intended to be reused after they are “tripped” during a power surge or an overcurrent situation. Much like fuses, circuit breakers are designed to trip at a certain current level. This is intended to protect both equipment and anyone in the area of that particular circuit. Circuit breakers can be found in just about any variation from single phase, low current applications to three phase, and high current applications.

As a general rule: fuses are more simplistic and reliable. They cost less initially and are better suited for individual circuit protection. However, they can create more cost over time with each use and may create hazards due to the exposed connection points. Whereas circuit breakers offer better branch circuit protection and do not need to be replaced after each use. They are more expensive initially and, because of their complexity, are more prone to failure over time.