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HH15 (QSA) / QP / QA Series Disconnect Switch Fuse Group For Main Switch
Primarily used as a manual, unattended main switch or master switch in power distribution circuits with high short-circuit currents and low power factors.
The HH15(QSA)/QP/QA series disconnectors integrate isolation, control, and protection functions, effectively isolating power and enabling safe maintenance. Built-in high-performance fuses provide reliable current limiting, effectively reducing the impact of short-circuit currents on equipment.
The compact design features a double- or multi-break contact system with wide contact spacing, ensuring standard clearance and creepage distances, enhancing electrical safety. A clear disconnect position indicator helps maintenance personnel confirm the isolation status.
Flexible mounting options allow for front- or rear-panel installation to meet the requirements of various cabinet structures. Suitable for power isolation and short-circuit protection in industrial and mining enterprises, building power plants, commercial buildings, and various types of complete power distribution equipment.
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HR5/HR6 Series Fuse-Type Isolating Switches for Power Supply and Distribution Circuits
The HR5/HR6 series power supply and distribution circuit fused disconnect switches are protective devices designed specifically for electrical equipment and are widely used in various industrial and commercial environments. Their primary purpose is to ensure the safe operation of electrical circuits by quickly disconnecting power in the event of a short circuit or overload, thereby preventing equipment damage and fire risks.
Features of these disconnect switches include:
1. High Reliability: Utilizing high-quality materials and advanced manufacturing processes, they ensure stable operation in a variety of environments.
2. Fast Response: A fast-acting fuse mechanism rapidly disconnects the circuit in the event of abnormal current flow, minimizing damage to equipment.
3. Easy Installation and Maintenance: The compact design allows for easy installation and facilitates routine inspection and maintenance, reducing maintenance costs.
4. Versatility: Suitable for a variety of voltage and current levels, they meet the needs of diverse electrical systems.
5. Safety: Compliant with international safety standards, they provide reliable protection even under extreme conditions.
Our HR5/HR6 series fuse disconnect switches are indispensable safety components in electrical systems. Their efficient and reliable performance makes them an ideal choice for protecting the safety of electrical equipment and personnel.
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HR17 Series Fuse Disconnect Switches Provide Both Isolation And Short-Circuit Protection
The HR17B series fuse-type disconnect switches are designed for load operation and are suitable for rated currents from 40A to 1600A. They are available in 1-, 2-, 3-, and 4-group configurations.
The HR17B series fuse-type disconnect switches, with their wide current range and flexible configuration options, are essential safety components in electrical systems. These disconnect switches can isolate circuits without disconnecting power, while also enabling quick disconnection for maintenance or troubleshooting when necessary, significantly enhancing the flexibility and safety of electrical systems.
Because they can operate at various current levels, the HR17B series fuse-type disconnect switches are suitable for a wide variety of industrial and commercial applications, including but not limited to power distribution, machine control, and building electrical systems. These disconnect switches are also designed for ease of operation and maintenance, making them user-friendly.
Whether operating in single-phase or three-phase systems, the HR17B series provides reliable isolation and protection, ensuring stable circuit operation under various operating conditions.
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CHH5 Series Disconnect Switches Are Used In High And Low Voltage Power Distribution Systems
The CHH5 series disconnect switches are electrical devices used for circuit protection and control, available in a variety of models to meet diverse application requirements. These disconnect switches are compact and easy to operate, suitable for a wide range of voltage levels and current capacities.
Their primary function is to ensure the safe disconnection of circuits during maintenance or overhaul, preventing accidental energization. CHH5 series disconnect switches are typically equipped with manual or motorized operating mechanisms, enabling fast and reliable switching.
These disconnect switches also feature excellent insulation performance and mechanical strength, enabling stable operation in harsh environments. Their structural design incorporates ease of maintenance, facilitating regular inspection and component replacement, thereby extending their service life.
The CHH5 series disconnect switches are widely used in industrial, commercial, and residential electrical systems and are essential components for ensuring safe power system operation.
Isolating Switches are key devices in power systems that ensure reliable circuit isolation. Chengxi's HH15, HR17, CHH5 series are designed for power distribution circuits with high short-circuit currents and low power factors. These switches support manual, infrequent operation and are widely used in high- and low-voltage distribution systems, switchgear, and control panels as main or general switches.
Notable product features include models such as the HR17 series that support load-break operation, with rated currents ranging from 40A to 1600A and configurations from 1 to 4 poles to suit diverse circuit requirements. The integrated fuse and isolation design provides both isolation and short-circuit protection functions. A visual contact gap enhances confirmation of circuit status, improving operational safety.
The switches have a compact structure and long mechanical life, with isolating and earthing switches rated for up to 3000 mechanical operations. They are engineered for industrial-grade environments, supporting wide temperature ranges and low humidity, complying with international electrical standards. Production emphasizes rigorous testing of contact conductivity and insulation performance, ensuring safe and reliable isolation for circuit maintenance and servicing.
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View MoreThe fuse-type isolation switch, a device that combines an isolation switch and fuses into a single unit, is a classic solution that remains highly relevant. But what specific benefits does it offer that make it a persistent choice for engineers and electricians?
The core advantage is the integration of two critical functions. The switch provides a safe, visible means of isolating a circuit, ensuring it is de-energized for maintenance. The fuses provide reliable, high-level protection against short-circuit faults. By combining them, the unit offers a compact and cost-effective solution.
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Advantage |
Description |
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Clear Visible Isolation |
When the switch is in the "OFF" position, it provides a physical air gap in the circuit. This offers a reliable, visible indication that the circuit is de-energized, which is a critical safety procedure (lockout/tagout) for maintenance. |
|
Integrated Protection |
It combines the isolating function of a switch with the protective function of a fuse. The fuse provides a high breaking capacity, safely interrupting severe short-circuit currents that could damage downstream equipment. |
|
Cost-Effectiveness |
As a single, integrated device, it is often more economical than purchasing a separate isolation switch and fuse assembly. This also saves on panel space and reduces wiring complexity. |
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Simplicity and Reliability |
The mechanism is fundamentally simple and robust with few moving parts. Unlike complex electronic breakers, it has no relays or programming, high mechanical reliability and a long operational life. |
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High Breaking Capacity |
Fuses are exceptionally good at safely interrupting very high fault currents (often denoted as Icu). For a given physical size, a fuse can typically handle a higher short-circuit current than a similarly priced circuit breaker. |
Low-Voltage Isolation Switches
These are commonly found in industrial, commercial, and residential distribution boards, typically for voltages up to 1000V AC.
Function: Their primary role is to ensure the safe isolation of a circuit for maintenance, repair, or installation work. They are a core part of Lockout/Tagout (LOTO) safety procedures.
Design: Often referred to as "disconnectors" or "switch-disconnectors." They can be load-breaking (able to switch under normal load current) or non-load-breaking (for isolation only when the circuit is de-energized).
Common Types: Include knife switches, rotary isolators, and the previously discussed fuse-type isolation switches.
Key Feature: They provide a visible "on/off" status and a physical air gap, offering assurance that the circuit is safe to work on.
High-Voltage Isolation Switches
These are used in transmission and distribution substations, operating at voltages from thousands to hundreds of thousands of volts.
Function: Their sole purpose is safety isolation. They are not designed to make or break load current. They are operated only after the circuit has been de-energized by a upstream circuit breaker.
Design: Due to the risk of electric arc formation at high voltages, they are designed with large clearances and are often operated by a manual or motorized mechanism from a safe distance.
Common Configurations: Include center-break, double-break, and pantograph (vertical break) styles, which are clearly visible on overhead structures in substations.
Key Feature: Their operation is always interlocked with the associated circuit breaker to prevent any attempt to open or close under load, which would be catastrophic.
The classic fuse-type knife switch, with its visible blades and porcelain base, may seem like a relic of early electrical systems. While it's true that modern molded-case circuit breakers (MCCBs) and enclosed switch-disconnectors have replaced them in many mainstream applications, the fuse-type knife switch still holds specific, valuable niches in today's industry. Its use is now more specialized, driven by its unique advantages of simplicity, visibility, and cost.
In industrial settings, a fused knife switch provides a highly reliable and visible means of isolating a motor circuit for maintenance. The fuses offer robust short-circuit protection, while the visible blades give technicians absolute confidence that the circuit is de-energized before working on the motor or drive. This is a fundamental requirement for safety compliance under lockout/tagout (LOTO) regulations.
Main or sub-main disconnector in older electrical installations and some specialized new panels. In situations where the high interrupting capacity of fuses is required and the visual confirmation of isolation is prized, these switches remain a practical choice. They are also found in applications involving power correction capacitors, where they are used to safely isolate the capacitor bank from the supply for servicing.
They see continued use in certain types of heating and welding equipment control circuits. These applications often involve simple on/off control with a need for overt current protection, a role for which the fuse-type switch is suited. Its mechanical durability and ability to withstand the electrical environment of industrial heaters make it a dependable choice.
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China Fuse Type Isolation Switch
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