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Home Breakers, Fuses & Circuit Protection Molded Case Circuit Breakers Square D Molded Case Circuit Breakers

Square D Molded Case Circuit Breakers

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Square D molded case circuit breakers offer robust and reliable protection for electrical systems. Known for their unit mount and I-Line constructions, these circuit breakers are designed to meet various current ratings and interrupt ratings. These critical specifications help customers choose the right circuit breaker based on the power requirements of their systems.

Square D molded case circuit breakers are often utilized in industrial settings where high levels of protection are required. The circuit breakers come in thermal magnetic types, which offer a blend of thermal and magnetic protections, ensuring that both overload and short-circuit conditions are adequately addressed. Depending on the application's need, these circuit breakers are available in a variety of configurations, including 3-pole models, to offer a range of protection mechanisms.

The dimensions of these breakers are standardized, facilitating easy integration into existing systems. Square D ensures that the ratings of their circuit breakers are compliant with CSA standards, lending credibility to their products and increasing the confidence of their customers. Additionally, Square D provides comprehensive support and tools to assist with the installation and maintenance of their circuit breakers.

Subcategories

Square D Molded Case B Frame Circuit Breakers
Square D Molded Case E Frame Circuit Breakers
Square D Molded Case H Frame Circuit Breakers
Square D Molded Case J Frame Circuit Breakers
Square D Molded Case L Frame Circuit Breakers
Square D Molded Case LA Frame Circuit Breakers
Square D Molded Case LH Frame Circuit Breakers
Square D Molded Case M Frame Circuit Breakers
Square D Molded Case P Frame Circuit Breakers
Square D Molded Case Q Frame Circuit Breakers
Square D Molded Case R Frame Circuit Breakers

Products

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Schneider Electric LHL3640036M LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
Schneider Electric LHL3640036M LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
$17095.50
Schneider LHL3640036M AL400LA Compliant, EU RoHS Declaration China RoHS declaration, Product out of China RoHS scope. Substance declaration for your information. Halogen free plastic parts product 115.06 lbf.in (13 N.m 0.07-0.47 in² (42-304 mm² AWG 1-600 kcmil, 115.06 lbf.in (13
Schneider Electric LHL3640035M LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
Schneider Electric LHL3640035M LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
$11397.00
Schneider LHL3640035M AL400LA Compliant, EU RoHS Declaration China RoHS declaration, Product out of China RoHS scope. Substance declaration for your information. Halogen free plastic parts product 115.06 lbf.in (13 N.m 0.07-0.47 in² (42-304 mm² AWG 1-600 kcmil, 115.06 lbf.in (13
Schneider Electric LAL3640036M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640036M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
$6928.50
Schneider LAL3640036M Motor Circuit Protector 400 A 3P Unit mount UL Listed, CSA, IEC 2000 A 4000 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 600 V AC, 250 V DC Lugs load, Lugs line 42 kA 240 V AC, 30 kA 480 V AC, 22 kA 600 V AC, 10 kA 125 V DC, 10 kA 250 V DC Thermal-m
Schneider Electric LAL3640035M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640035M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
$6928.50
Schneider LAL3640035M Motor Circuit Protector 400 A 3P Unit mount IEC, UL Listed, CSA 1750 A 3500 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 600 V AC, 250 V DC Lugs load, Lugs line 42 kA 240 V AC, 30 kA 480 V AC, 22 kA 600 V AC, 10 kA 125 V DC, 10 kA 250 V DC Thermal-m
Schneider Electric LAL3640032M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640032M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
$6928.50
Schneider LAL3640032M Motor Circuit Protector 400 A 3P Unit mount IEC, UL Listed, CSA 1250 A 2500 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 600 V AC, 250 V DC Lugs load, Lugs line 42 kA 240 V AC, 30 kA 480 V AC, 22 kA 600 V AC, 10 kA 125 V DC, 10 kA 250 V DC Thermal-m
Schneider Electric LAL3640031M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640031M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
$6928.50
Schneider LAL3640031M Motor Circuit Protector 400 A 3P Unit mount IEC, UL Listed, CSA 1125 A 2250 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 600 V AC, 250 V DC Lugs load, Lugs line 42 kA 240 V AC, 30 kA 480 V AC, 22 kA 600 V AC, 10 kA 125 V DC, 10 kA 250 V DC Thermal-m
Schneider Electric LAL3640028M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC, 400A, 3P
Schneider Electric LAL3640028M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC, 400A, 3P
$6928.50
Schneider LAL3640028M Motor Circuit Protector 400 A 3P Unit mount UL Listed, IEC, CSA 750 A 1500 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 600 V AC Lugs load, Lugs line 42 kA 240 V AC, 30 kA 480 V AC, 22 kA 600 V AC, 10 kA 125 V DC, 10 kA 250 V DC Thermal-magnetic AWG
Schneider Electric Q4L3400 Q4L MOLDED CASE CIRCUIT BREAKER, 240VAC, 400A, 3P
Schneider Electric Q4L3400 Q4L MOLDED CASE CIRCUIT BREAKER, 240VAC, 400A, 3P
$5746.50
Schneider Q4L3400 Circuit breaker 400 A 3P Unit mount IEC, UL Listed, CSA 2000 A 4000 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 104 °F (40 °C 240 V AC Lugs load, Lugs line 25 kA 120 V AC, 25 kA 240 V AC Thermal-magnetic AWG 1-600 kcmil aluminium/copper1, AWG 1-250 kcm
Schneider Electric Q4L3350 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 350A, 3P
Schneider Electric Q4L3350 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 350A, 3P
$5746.50
Schneider Q4L3350 Circuit breaker 350 A 3P Unit mount UL Listed, IEC, CSA 1750 A 3500 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 104 °F (40 °C 240 V AC Lugs load, Lugs line 25 kA 120 V AC, 25 kA 240 V AC Thermal-magnetic AWG 1-600 kcmil aluminium/copper1, AWG 1-250 kcm
Schneider Electric Q4L3300 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 300A, 3P
Schneider Electric Q4L3300 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 300A, 3P
$5746.50
Schneider Q4L3300 Circuit breaker 300 A 3P Unit mount UL Listed, IEC, CSA 1500 A 3000 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 104 °F (40 °C 240 V AC Lugs load, Lugs line 25 kA 120 V AC, 25 kA 240 V AC Thermal-magnetic AWG 1-600 kcmil aluminium/copper1, AWG 1-250 kcm
Schneider Electric Q4L3250 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 250A, 3P
Schneider Electric Q4L3250 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 250A, 3P
$5746.50
Schneider Q4L3250 Circuit breaker 250 A 3P Unit mount CSA, IEC, UL Listed 1250 A 2500 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 104 °F (40 °C 240 V AC Lugs load, Lugs line 25 kA 120 V AC, 25 kA 240 V AC Thermal-magnetic AWG 1-600 kcmil aluminium/copper1, AWG 1-250 kcm
Schneider Electric Q4L2400 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 400A, 2P
Schneider Electric Q4L2400 QAL MOLDED CASE CIRCUIT BREAKER, 240VAC, 400A, 2P
$4756.50
Schneider Q4L2400 Circuit breaker 400 A 2P Unit mount UL Listed, IEC, CSA 2000 A 4000 A 11 in (279.40 mm 6 in (152.40 mm 5.84 in (148.34 mm 104 °F (40 °C 240 V AC Lugs load, Lugs line 25 kA 120 V AC, 25 kA 240 V AC Thermal-magnetic AWG 1-600 kcmil aluminium/copper1, AWG 1-250 kcm

FAQs

What is an interrupt rating?

The interrupt rating of a circuit breaker refers to the maximum amount of fault current that the breaker can safely interrupt without sustaining damage or causing a hazard. In other words, it's the highest level of current that the circuit breaker can handle and effectively "break" in the event of a short circuit or other overcurrent condition. The interrupt rating is usually given in amperes (A) and is an essential factor to consider when choosing a circuit breaker for specific applications.

What is a current rating?

The current rating of a circuit breaker, often simply referred to as its "rating," indicates the maximum continuous current that the breaker can carry safely without tripping under specified conditions. This is typically measured in amperes (A). The current rating is a key specification, and it plays a critical role in protecting an electrical circuit by determining the threshold above which the breaker will disconnect the electrical supply, thereby preventing overcurrent conditions that could result in damage to wiring or electrical devices.

 

What is a Circuit Breaker?

There are two different types of technologies that are commonly used in circuit breakers. 

Magnetic Breakers

Magnetic Breakers are designed to react to short circuits or sharp spikes in voltage and current. The more current that passes through the breaker’s electromagnet, the stronger the magnet becomes. When the current exceeds the rating for that particular breaker, the magnetic force becomes strong enough that it will pull the contact back and disconnect it from the other contact, disconnecting power from the device.

Thermal Protection Breakers

Thermal Protection Breakers protect against a sustained overcurrent, or a higher current, for a longer period of time. Thermal protection uses a Bimetal strip that will bend the contacts away from each other to disconnect power. Thermal Magnetic Breakers are the most common type of circuit breakers. They combine magnetic technology to protect against short circuits or sharp spikes and thermal technology that protects against sustained overcurrent for a long period of time.

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