Control and protection switches are the upgraded and replaced products of circuit breakers, contactors, and thermal overload relays. They are the ideal replacements for electromagnetic starters, protective starters, and combination starters.

Structural Features:
The control and protection switches are primarily composed of main circuit contactors, intelligent controllers, electromagnetic mechanisms, operating mechanisms, and auxiliary contact modules. The main circuit contact assembly consists of bridge-type contacts, double-break contacts, grid arc extinguishing chambers, and current-limiting rapid-acting mechanisms. Each pole is equipped with a set, which, upon a short circuit at the load end, rapidly separates the main contacts while simultaneously actuating the operating mechanism to break the coil circuit, putting each phase in an open state.
The product features a modular single product structure that integrates the main functions of traditional circuit breakers (fuses), contactors, overload (or overcurrent, phase loss) protective relays, starters, isolators, etc. It offers both long-distance automatic control and on-site direct manual control, with panel indicators and mechanical/electrical signal alarms. It is equipped with overvoltage and undervoltage protection functions, phase loss protection, and a coordinated time-current protection characteristic (including inverse-time, timed, and instantaneous tripping protection). Depending on requirements, optional function modules or accessories can be selected to control and protect various motor loads and distribution loads.
In terms of its structure and function, the control and protection switch is no longer a single product like a contactor, circuit breaker, or thermal relay; it's a complete control and protection system. Its introduction fundamentally resolves the various issues of mismatched control and protection due to不合理 selection of discrete components (usually consisting of a circuit breaker or fuse + contactor + overload relay), particularly overcoming the phenomenon of discordant coordination between protection and control characteristics when electrical products with different assessment standards are combined. This significantly enhances the operational reliability and continuous performance of the control and protection system.
Features and Applications
High efficiency and energy-saving, low temperature rise
The control and protection switchgear utilizes advanced energy-saving technology. The switch electromagnetic system incorporates a start-up current circuit and a switch holding current circuit. The electromagnetic system operates with AC startup and DC holding via a single-chip microcontroller. This reduces the core loss and short-circuit loop loss of the electromagnetic system, with copper wire loss in the coils being approximately 4% of the original. It saves energy, while also lowering the temperature rise and noise of the electromagnetic system switchgear.
Section 2: Reliable Performance, Longevity
The electromagnetic system of the control and protective switchgear has been enhanced with a cushioning device, reducing the energy shock to the switching electromagnetic system and thereby improving the switching's latching performance and extending its service life. In the microelectronics aspect of control and protective switchgear, a microcontroller (PIC) and renowned electronic components are used, with a carefully designed circuit. This optimizes the design from both the hardware and software sides, reducing electromagnetic interference and enhancing product reliability.
The specific features and functions are as follows:
1. Features long-distance automatic control and on-site direct manual control; 2. Equipped with panel indication and mechanical/electrical signal alarm functions.
3. Time-current coordination protection characteristics (with long delay, short delay for short circuit, and instantaneous three-section protection); 4. Features including phase loss, overcurrent, stall, short circuit, undercurrent, overvoltage, undervoltage, leakage, three-phase imbalance, isolation, and start delay (to avoid high start-up current, separated from overcurrent operation time).
5. The monitor uses LED displays for various operating and fault states. It features a voltmeter and ammeter function.
6. Equipped with a set key, shift key, data key, reset key, allowing for setting and querying various parameters; thanks to the MCU's E2PROM memory technology, parameter settings are retained even after power off, eliminating the need for reconfiguration.
7. Features fault memory function for easy fault inquiry and analysis.
8. Equipped with an RS485 communication interface and an open fieldbus (Mod Bus protocol, etc.), it offers convenience for user system integration and facilitates intelligent management for users.
9. Users can select optional function modules or accessories as needed to achieve control and protection of various electric motor loads and distribution loads.
Application and Fields of Use:
Due to its integrated control and protection functions, modular structure, compact size, high protection grade against environmental pollution, high capacity for breaking and short-circuit currents, minimal arcing, long electrical lifespan, high reliability in continuous operation, and ease of installation, use, and maintenance, it is particularly suitable for electrical control systems in modern buildings such as pumps, fans, air conditioning, fire protection, and lighting. It is also ideal for motor control and protection in industries such as metallurgy, coal mining, steel, petrochemicals, ports, ships, and railways. This includes motor control centers (MCCs), especially for intelligent electrical control systems or MCCs requiring high-breaking capacity (if the Ics is required to reach 80KA for the distribution control system). Additionally, for single-motor control and protection in factories or workshops.
2. With advanced digital processing technology applied, the product boasts high measurement accuracy, excellent linearity, accurate and reliable fault resolution, and strong anti-interference capability. It can be remotely controlled or locally manually controlled, works continuously after a short circuit, has high protection grade, high breaking capacity, small arc flash distance, long lifespan, compact size, easy installation and maintenance, and many other advantages such as proximity options.
Comprehensive accessories including auxiliary contacts and signal alarm contacts, auxiliary release switches, remote release switches, door or drawer panel operating mechanisms, control circuit conversion modules, and more can form a complete control and protection unit on a single product, achieving coordinated and cooperative control and protection functions. Horizontal, vertical, and horizontal installations do not affect performance. They can be widely used in compact integrated systems, including fixed or drawer-type MCC cabinets, particularly in 12, 16, 18, 32, 45, 85, 100 applications in 1/4 and 1/2 drawers, offering superior advantages over separate components. The terminals with anti-touch functions on the front and plug-in terminals on the back of the panel, after being equipped with a high protection grade housing, are suitable for humid locations in civil buildings, basements, pump rooms, coal mines, ports, ships, petrochemical plants, and other fields, making them an ideal product to replace electromagnetic starters, protective, and combined starters. Control and protection switches are mainly used in AC power systems with a frequency of 50HZ (60HZ), rated voltage up to 690V, and current ranging from 0.16A to 100A, for connecting, carrying, and disconnecting currents under normal conditions, including overload conditions, and are also capable of connecting, carrying, and disconnecting currents under specified abnormal conditions (such as short-circuit currents).
Application Fields:
Distribution and motor protection and control systems for industrial facilities in metallurgy, coal mining, steel, petrochemicals, ports, ships, and railways; Motor Control Centers (MCCs), especially for intelligent electrical control systems or distribution control and protection systems requiring a rated short-circuit breaking capacity (Ics) up to 80KA; Single motor control and protection systems; Distribution centers for commercial and civil facilities