LH-Frame Circuit Breakers
LH-Frame Circuit Breakers from Square D by Schneider Electric are molded case circuit breakers designed to provide dependable overcurrent protection in industrial and commercial electrical systems. These breakers are rated for applications up to 600 VAC or 250 VDC and are available in ampere ratings from 150 to 400 amps. Built with thermal magnetic trip technology, LH-frame breakers help protect conductors, equipment, and connected systems from both sustained overloads and instantaneous fault conditions.
Thermal magnetic protection combines two protective functions in one device. The thermal trip element responds to smaller overloads that develop over time, helping prevent overheating and damage caused by prolonged overcurrent conditions. The magnetic trip element reacts quickly to high fault currents, opening the circuit instantly when preset levels are reached. This combination makes LH-frame breakers well suited for applications where both branch circuit protection and equipment protection are required.
Square D LA and LH molded case circuit breakers are offered in 2-pole and 3-pole designs, with unit-mount, I-Line, and rear-connect construction options to support a wide range of installation requirements. LH molded case breakers are commonly used in industrial enclosures, switchboards, panelboards, busway plug-in units, combination starters, and motor control centers. Their flexible mounting styles and broad current range make them a practical solution for power distribution systems that require reliable thermal magnetic protection.
FAQs
Q: What is an LH-frame circuit breaker?
An LH-frame circuit breaker is a Square D molded case circuit breaker designed for overcurrent protection in industrial and commercial electrical systems. It is commonly used in applications requiring current ratings from 125 to 400 amps.
Q: What type of protection does an LH-frame breaker provide?
LH-frame breakers provide thermal magnetic protection. This means they protect against both long-duration overloads and high-level fault currents within a single breaker.
Q: How does the thermal trip element work?
The thermal trip element responds to smaller overloads that continue over time. As the overload increases, the breaker trips faster, helping protect wiring and equipment from overheating.
Q: How does the magnetic trip element work?
The magnetic trip element is designed to trip the breaker instantly when a high fault current is detected. This fast response helps reduce damage during short circuit or severe overcurrent events.
Q: What voltage ratings are available for LH-frame circuit breakers?
LH-frame circuit breakers are designed for applications up to 600 VAC or 250 VDC, depending on the specific model and configuration.
Why Buy LH-Frame Circuit Breakers from RSP Supply
RSP Supply offers LH-Frame Circuit Breakers from Square D by Schneider Electric for industrial and commercial power distribution applications requiring dependable overcurrent protection. With current ratings from 125 to 400 amps, multiple pole options, and several construction styles available, these molded case breakers support a wide range of panel, switchboard, and motor control installations. Customers choose RSP Supply for access to trusted electrical protection products, knowledgeable service, and a focused selection of industrial components suited for demanding environments. LH-frame breakers provide proven thermal magnetic protection for overload and fault conditions, helping support safe and reliable operation across many electrical systems.