Main Classifications of Circuit Breakers

Mar 15, 2026

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Classified by number of poles: Available in single-pole, double-pole, triple-pole, and four-pole configurations, among others.

 

Classified by installation method: Available in plug-in, fixed, and withdrawable (drawer-type) configurations, among others.

 

Product Introduction: A9/EC65 Miniature Circuit Breaker - Designed for lighting distribution circuits; provides protection against short circuits and overloads.

 

A9LE/EPNLE Residual Current Circuit Breaker (RCCB) - Provides protection against short circuits, overloads, and earth leakage faults within grounding systems. During normal operation or upon fault detection, the circuit breaker trips to the "off" position, ensuring that both the phase line and the neutral line are simultaneously disconnected; this prevents the neutral line from remaining live in the event of a neutral line fault. During switching operations, the neutral line connects *first* and disconnects *last* (delayed disconnection). Features short-circuit current-limiting capabilities and a high rated short-circuit breaking capacity. Equipped with comprehensive protection devices-including overload, short-circuit, earth leakage, and over/under-voltage protection-offering complete functionality and convenient, reliable wiring.

 

Over/Under-Voltage Release Unit - The fully automatic, time-delayed over/under-voltage protector is a new-generation product developed in response to market demand. This protector features a rational design and is assembled using a combination of imported and renowned domestic components. The device is capable of rapidly and reliably switching off the power supply in the event of high-voltage surges or under-voltage conditions, thereby protecting household appliances. Once the voltage returns to its normal range, the device automatically reconnects the circuit and restores power after a brief time delay, effectively shielding appliances from the damaging impact of sudden power restoration. All functions are fully automated, requiring no manual intervention; the unit utilizes a dual-color LED indicator for status display, ensuring safe and rapid operation.

 

EC100 Miniature Circuit Breaker - Designed for industrial power distribution systems; provides protection against short circuits and overloads. Features a rated current range of 63A–125A, a high rated short-circuit breaking capacity, and a short-circuit current-limiting structure. Offers comprehensive protection capabilities, including built-in overload and short-circuit protection devices. Features safe and reliable wiring via a "box-type" terminal structure, allowing for easy and reliable functional expansion through the addition of various accessories. Compatible accessories include: residual current release units, auxiliary contacts, alarm contacts, shunt release units, under-voltage release units, and busbars.

 

EPD Surge Protective Device (SPD) - The pluggable (modular) EPD series utilizes the same operating principles and selection criteria as the fixed-type surge protective devices. Provides protection against surges resulting from indirect and direct lightning strikes, as well as other transient overvoltages.

 

EIC1 AC Contactor: Primarily used in AC circuits (50Hz or 60Hz) with a rated voltage of up to 660V for the remote switching (making and breaking) of circuits. It can be combined with thermal relays or electronic protectors of corresponding specifications to form electromagnetic or mechatronic motor starters.

 

ENS Molded Case Circuit Breaker (MCCB): This molded-case circuit breaker is a new type of breaker designed and developed through the comprehensive application of advanced international technologies. With a rated insulation voltage of 800V, it is suitable for use in power distribution networks operating at AC 50Hz or 60Hz, with a rated operational voltage of up to 690V and a rated operational current ranging from 6A to 1250A. It serves to distribute electrical energy and protect lines and power supply equipment against damage caused by faults such as overload, short circuits, and undervoltage. Additionally, it can be utilized for the infrequent starting of motors, providing protection against overload, short circuits, and undervoltage conditions. Characterized by its compact size, high breaking capacity, and short (or non-existent) arc-flashing distance, this circuit breaker is an ideal product for users. The circuit breaker can be installed either vertically or horizontally.

 

ENSLE Molded Case Earth Leakage Circuit Breaker: Designed to provide indirect contact protection for personnel and to prevent fire hazards caused by ground fault currents resulting from equipment insulation failure. It also serves to distribute electrical energy and protect lines and power supply equipment against overload and short circuits. Furthermore, it can be used for the infrequent switching of lines and the infrequent starting of motors. While conventional circuit breakers with residual current protection typically derive their leakage protection module's operating power from two phases, this series of circuit breakers utilizes a three-phase power sampling method; consequently, the leakage protection module remains fully functional even if one of the phases is lost. The rated residual operating current and maximum disconnection time are field-adjustable to suit specific application requirements.

 

EGL-125 Disconnecting Switch (Isolator): The disconnecting switch is one of the most widely utilized devices within high-voltage switchgear assemblies, serving the primary function of providing electrical isolation within a circuit. While its fundamental operating principles and structural design are relatively simple, its widespread usage and the stringent requirements for operational reliability mean it exerts a significant influence on the design, construction, and safe operation of substations and power plants. The primary characteristic of a disconnect switch is its lack of arc-extinguishing capability; consequently, it can only open or close a circuit when no load current is flowing. The EGL-125-4000A model is designed for applications involving the switching between two low-voltage circuits, the transfer between two load devices, or safety isolation purposes.

 

EATS3 Dual Power Automatic Transfer Switch: This device ensures power supply reliability by utilizing two independent power sources, enabling reliable switching between the two inputs within a single unit. The product offers two distinct switching modes: automatic transfer with automatic return, and automatic transfer without automatic return. This specific model functions as a manual transfer switch. It features an innovative design, offers high levels of safety and reliability, boasts a high degree of automation, and is suitable for a wide range of applications.

 

EW45 Universal Intelligent Circuit Breaker: Primarily designed for power distribution, this device protects power lines and electrical equipment against hazards such as overloads, short circuits, undervoltage conditions, and single-phase ground faults. The circuit breaker incorporates a suite of intelligent protection functions, enabling selective protection capabilities. Its precise tripping mechanism helps prevent unnecessary power outages, thereby enhancing both the reliability and safety of the power supply system.

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