3P AC Miniature Circuit Breaker for Three Phase Power Distribution Systems

PUGAO Mora PLS-60H 3P AC Miniature Circuit Breaker for Three Phase Power Distribution Systems is designed for three-phase three-wire AC distribution systems requiring coordinated protection of multi-phase electrical loads. The circuit breaker integrates three-pole linked switching, allowing L1, L2, and L3 phase conductors to be disconnected simultaneously during overload, short-circuit faults, or maintenance operations.

Compared with single-phase circuit breakers, the 3P design is developed for applications where phase interruption may affect equipment operation, especially for motor-driven loads, pumps, compressors, and industrial electrical equipment. The thermal magnetic trip mechanism provides long-duration overload protection and rapid short-circuit protection, making it suitable for three-phase distribution cabinets, commercial electrical panels, and equipment control systems.

The Mora PLS-60H series supports B, C, and D trip curves with rated current options from 6A to 63A and breaking capacity options up to 10kA. Manufactured in PUGAO’s Yueqing, Zhejiang factory, the product integrates plastic molding, component processing, assembly, and performance inspection within its own production system.

Product Specifications

Features

Three-Pole Linked Switching for Three-Phase Protection

The 3P AC Miniature Circuit Breaker for Three Phase Power Distribution Systems adopts an integrated mechanical linkage structure that enables synchronized operation of all three poles.

When an overload or short-circuit fault occurs in any phase, the internal mechanism disconnects the three poles together to isolate the complete three-phase circuit. This design helps prevent abnormal operating conditions caused by uneven phase disconnection and is suitable for electrical systems containing motors and other three-phase equipment.

During maintenance, switching the handle to the OFF position disconnects all three-phase conductors simultaneously, providing a clear isolation status for electrical inspection.

Trip Curve Options for Different Electrical Loads

The circuit breaker provides B, C, and D trip curve options to match different three-phase load characteristics.

The C curve is widely selected for general industrial and commercial distribution, while the D curve is preferred for equipment requiring higher tolerance against startup current surges.

Flame-Retardant Housing and Reinforced Conductive Structure

The circuit breaker uses V0-grade PA66 flame-retardant housing material designed for electrical distribution environments. The internal conductive system adopts reinforced copper components and silver alloy contacts to maintain stable electrical performance during repeated switching operations.

The tunnel-type terminal structure supports different cable specifications and provides secure connection for distribution cabinets and electrical panels.

High Breaking Capacity and Production Testing

The standard configuration provides a 6kA short-circuit breaking capacity, while upgraded versions are available with up to 10kA breaking capacity for applications requiring higher fault interruption capability.

Before shipment, each finished circuit breaker undergoes performance inspection covering overload characteristics, short-circuit response, temperature rise control, and three-pole synchronous operation. The production process maintains traceability from component input to finished product inspection.

OEM Customization for Three-Phase Circuit Breaker Products

PUGAO provides customized production services for overseas electrical brands, distributors, and engineering projects requiring private-label circuit breakers.

The product appearance can be customized through logo marking and housing color adjustment, while rated current configuration and export packaging can be modified according to different market requirements. The production system supports both standard models and customized three-phase AC miniature circuit breaker series.

Working Principle

Overload Protection

When the three-phase circuit operates above its rated current for an extended period, the internal thermal element gradually heats and deforms. This movement activates the trip mechanism, disconnecting the circuit and reducing the impact of continuous overload conditions on cables and electrical equipment.

Short Circuit Protection

During phase-to-phase short circuits or other high-current faults, the electromagnetic trip unit responds rapidly to the sudden current increase. The internal mechanism separates the contacts quickly, interrupting the fault current and protecting downstream equipment from short-circuit damage.

After troubleshooting is completed, the operating handle can be manually reset to restore power.

Applications

Industrial Motor Equipment Protection

The 3P AC Miniature Circuit Breaker is widely used in three-phase motor-driven equipment, including water pumps, compressors, ventilation fans, and small machining machines.

For motors with high starting current characteristics, the D-curve configuration helps the circuit breaker withstand temporary startup current increases while maintaining overload and short-circuit protection during normal operation.

Commercial Three-Phase Distribution Systems

In commercial buildings, workshops, and retail facilities, the circuit breaker is installed in three-phase distribution panels to protect equipment branch circuits and power supply lines.

Typical applications include central air conditioning outdoor units, commercial ventilation systems, and other three-phase electrical equipment requiring independent protection.

Three-Phase Photovoltaic AC Output Protection

The 3P AC Miniature Circuit Breaker can be installed on the AC output side of three-phase photovoltaic inverters as a protection and isolation device.

The three-pole linked structure enables simultaneous disconnection of all phase conductors during photovoltaic system inspection and maintenance, making it suitable for industrial and commercial distributed solar applications.

Factory Capability

Zhejiang Pugao Electric Power was established in 2011 and operates a 5,000㎡ manufacturing facility in Yueqing, Zhejiang.

The factory integrates plastic injection molding, copper component processing, hardware assembly, automated production, and electrical performance inspection within its own manufacturing system. This integrated production structure allows control over key processes from component manufacturing to final circuit breaker assembly.

Automated testing equipment is used to verify overload characteristics, short-circuit protection performance, temperature rise behavior, and three-pole synchronous operation before products leave the factory.

With ISO9001 quality management system certification and intellectual property management system certification, PUGAO maintains production traceability throughout the manufacturing process. The factory supports sample evaluation, small-batch trial orders, OEM production, and large-volume export supply.

Why Choose PUGAO Mora 3P AC Miniature Circuit Breaker

PUGAO 3P AC Miniature Circuit Breaker for Three Phase Power Distribution Systemsis developed for three-phase distribution applications requiring synchronized pole operation and reliable protection of industrial electrical loads.

The product combines three-pole linkage design, thermal magnetic protection, multiple trip curve options, and DIN rail installation compatibility for a wide range of commercial and industrial electrical systems.

With in-house manufacturing capabilities covering molding, component processing, assembly, and testing, PUGAO provides customized production support for overseas electrical brands and engineering projects requiring three-phase distribution products.