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Square D Molded Case Circuit Breakers

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Square D by Schneider Electric has a wide range of Molded Case Circuit Breakers that are designed with thermal magnetic protection. Thermal trip element circuit breakers protect a circuit against a small overload that continues for a long time. The larger the overload, the faster the circuit breaker will trip. The thermal element will also protect against temperature increases. Magnetic circuit breakers will trip instantly when the preset current is present. Thermal magnetic circuit breakers contain both types of protection in a single unit. 

LA and LH Molded Case Circuit Breakers provide thermal magnetic protection from 125 to 400 Amps as part of the Square D portfolio of molded case circuit breakers. They are available in 2 and 3 pole design with unit-mount, I-line or rear-connect constructions. LH molded case circuit breakers are used in industrial enclosures, switchboards, panelboards, busway plug-in units, combination starters and motor control centers.

Q4 Molded Case Circuit Breakers provide thermal magnetic protection from 250 to 400 Amps up to 240 Vac with interrupting ratings of 25 kA at 240 Vac. They are available in 2 and 3 pole design with unit-mount and I-line constructions.

Products

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Schneider Electric LHL3640036M LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
Schneider Electric LHL3640035M LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
Schneider Electric LAL3640036M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640035M1021 LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
Schneider Electric LAL3640035M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640033M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640032M1155 LA Frame MOTOR CIRCUIT PROTECTOR 600V 400A
Schneider Electric LAL3640032M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640031M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC/250VDC, 400A, 3P
Schneider Electric LAL3640030M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC, 400A, 3P
Schneider Electric LAL3640028M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC, 400A, 3P
Schneider Electric LAL3640022M LAL LA Frame MOTOR CIRCUIT PROTECTOR, 600VAC, 400A, 3P

 

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