AC Overload and Short Molded Case Circuit Breaker

Our AC Overload and Short Molded Case Circuit Breaker, produced by Pugao(Plannter Electric), are engineered to meet advanced requirements in power distribution protection. A key performance parameter is their ultimate short-circuit breaking capacity (Icu), typically rated between 50kA and 100kA across different models. This high breaking capacity guarantees safe interruption and system stability under severe short-circuit conditions. We are here to assist and will reply to your messages as soon as possible.

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Product Description

Engineered for critical power distribution, the AC Overload and Short Molded Case Circuit Breaker is a high-performance protection device designed to safeguard electrical networks from overloads and severe short circuits. Part of our advanced PLM1 series, this breaker combines robust mechanical construction with precise electronic protection, ensuring stability for systems operating up to 690V and 1250A.

Core Advantages & Key Features

High Breaking Capacity (Icu): Rated between 50kA and 100kA, guaranteeing safe interruption even under extreme short-circuit conditions.
Precision Protection: Equipped with a high-precision electronic trip unit (the "brain" of the breaker) allowing for adjustable long-delay, short-delay, and instantaneous settings.
Superior Durability: Built for a mechanical life of 10,000 to 20,000 cycles, ensuring long-term reliability in demanding industrial environments.
Advanced Arc Extinguishing: Features a magnetic blow-out coil and splitter plates to segment and cool arcs in milliseconds, safely interrupting fault currents.

Technical Specifications

Product Name	AC Overload and Short Molded Case Circuit Breaker (PLM1 Series)
Rated Operational Voltage (Ue)	690V AC (PLM1-63 is 400V)
Rated Insulation Voltage (Ui)	800V / 1000V (PLM1-63 is 500V)
Rated Current (In)	Up to 1250A (e.g., 400A standard models)
Breaking Capacity (Icu)	50kA – 100kA
Trip Unit Type	Electronic (Adjustable: Long-delay, Short-delay, Instantaneous)

Type	Rated Current (A)	Pole number	Rated Insulating Voltage(V)	Rated operating voltage(V)	Ultimate short circuit breaking capacity(KA)	Servies short circuit breaking capacity(KA)	Utilization category
PLM1-63L	(6),10,16,20,25 ,32,40,50,63	3	AC 500V	400V	25	18	A
PLM1-63M	(6),10,16,20,25 ,32,40,50,63		AC 500V		50	35
PLM1-100L	(10),16,20,25,32,40, 50,63,80,100		AC 690V		35	22
PLM1-100M					50	35
PLM1-100H					85	50
PLM1-225L	100,125,160,180,200,000	4			35	25
PLM1-225M					50	35
PLM1-225H					85	50
PLM1-400L	225,250,315,400				50	35
PLM1-400M	225,250,315,400				65	42
PLM1-630L	400,500,630				50	35
PLM1-630M					65	42
PLM1-630H					100	65
PLM1-800M	630,700,800	3			70	50
PLM1-800H	630,700,800				100	65
PLM1-1250	80,010,001,250				65	32.5
PLM1-1250	80,010,001,250				65	32.5

Applications

The PLM1 series is suitable for vertical and horizontal installation in various sectors:

Industrial Power Distribution: Protecting main circuits in factories and manufacturing plants.
Infrastructure: Used in large commercial buildings and energy facilities.
Motor Control: Designed for infrequent changing over and starting of motors.

Quality Assurance & Manufacturing

At Pugao Electric, we understand that craftsmanship directly influences safety. Our production process ensures every AC Overload and Short Molded Case Circuit Breaker meets international standards:

Precision Electronics: We use high-precision SMT and wave soldering for durable circuit boards.
Individual Calibration: Every electronic trip unit is individually calibrated using dedicated test equipment to match designed protection curves.
Stringent Testing: 100% factory testing for mechanical, electrical, and environmental performance before shipment.
Certifications: Compliant with ISO9001, ISO14001, and ISO45001 standards.

Why Choose Pugao(Plannter Electric)?

Selective Tripping: Our adjustable settings allow seamless coordination with upstream/downstream devices, preventing widespread blackouts.
Global Experience: We supply markets around the world with reliable, defect-free products.
Advanced Tech: Adopting international advanced technology for superior arc extinguishing and thermal stability.

Service, Packaging & Support

Warranty: Comprehensive warranty coverage ensuring peace of mind.
Packaging: Durable, export-grade packaging designed to withstand long-distance handling.
Support: We provide installation guidance and technical support. Contact us for manuals or usage instructions.

FAQ

What is the difference between long-delay and short-delay settings?

Long-delay protects against overloads (e.g., at the full 400A rated current) to prevent cable overheating. Short-delay allows for a brief pause during high current surges to coordinate with downstream breakers, clearing localized faults without tripping the main breaker.

Can this breaker be used for motor starting?

Yes, the AC Overload and Short Molded Case Circuit Breaker PLM1 series is rated for infrequent changing over and starting of motors, provided the current ratings match the motor requirements.

How does the arc extinguishing system work?

It uses a magnetic blow-out coil to create a strong magnetic field that pulls the arc into a chamber with splitter plates. This segments and cools the arc, extinguishing it safely within milliseconds.

Do you offer samples or custom support?

We support customized orders and can discuss sample requirements for quality testing. Please contact our sales team for details.

Hot Tags: AC Overload and Short Molded Case Circuit Breaker

Related Category

AC Molded Case Circuit Breaker

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Contact Info

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Address

Qiligang Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province, China
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Tel

+86-18072106366
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E-mail

kevin@pugaoai.com

For inquiries about mini circuit breaker, voltage protector, changeover switch or price list, please leave your email to us and we will be in touch within 24 hours.