Junray Electrical ATS Dual Power Automatic Transfer Switch-CB is a cost-effective automatic switching solution designed for secondary loads such as emergency lighting, fire exhaust systems, and general backup power in commercial buildings, residential complexes, and small factories. Unlike PC-class transfer switches which use expensive isolators without built-in protection, this CB-class solution utilizes standard circuit breakers combined with an intelligent controller, providing both overload/short-circuit protection and automatic power transfer functionality. Rated current ranges from 32A to 800A with 3P/4P configurations, featuring mechanical and electrical dual interlocking to prevent parallel connection of power sources.
Although PC-level switching performance is excellent, the price is high, which is a considerable waste for non-core loads; and in the event of a power outage, business and life will come to a standstill with single-power supply. The ATS Dual Power Automatic Transfer Switch-CB from Junray Electrical abandons the expensive isolation switch structure and adopts a mature and economical circuit breaker combination solution. This means that you don't have to pay a high premium to obtain reliable dual-power automatic switching functionality. It perfectly balances cost and performance, allowing ordinary users to afford the "no-power-loss" guarantee and completely resolves the contradiction between limited budget and the need for power supply.
The core competitiveness of the ATS Dual Power Automatic Transfer Switch-CB lies in its unique "circuit breaker + controller" structural design:
High cost-effectiveness: Compared to PC-level products, the CB-level solution uses standardized plastic-encased circuit breakers as the actuator, significantly reducing manufacturing costs. For ordinary loads that do not require millisecond-level switching (such as lighting, sockets, and ordinary power), this is the most cost-effective choice.
Dual protection functions: This is a major highlight that distinguishes it from PC-level. Since the circuit breaker is used as the main switch, it comes with overload and short-circuit protection functions. Whether it's the main power supply or the backup power supply, once an abnormal current occurs in the line, the circuit breaker will automatically trip to cut off the fault, preventing line burnout and equipment damage, equivalent to giving both power sources a "bulletproof suit".
Automatic seamless monitoring: With an internal intelligent controller, it monitors the mains voltage in real time. When the mains power is off, phase missing, or the voltage is abnormal, it can automatically start the switching mechanism to transfer the load to the backup power supply, ensuring uninterrupted power supply. Although the switching time is slightly longer than that of PC-level, it fully meets the needs of most civilian and commercial scenarios.
As a professional Manufacturer with profound technical expertise, Junray Electrical strictly adheres to the national standards for CB-level dual power automatic transfer switches in its production. Our factory is equipped with a mature circuit breaker assembly line and an intelligent controller testing platform, ensuring that each product is sturdy and durable.
This ATS Dual Power Automatic Transfer Switch-CB features reliable mechanical and electrical interlocks for dual protection, preventing short circuits caused by simultaneous connection of the two power sources. Each switch undergoes strict power-on debugging, switching logic testing, and protection characteristic testing before leaving the factory, ensuring stable operation within a wide current range of 32A to 800A, and providing you with a reliable power switching service for a long time.
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Rated Voltage |
AC 400V |
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Rated Frequency |
50Hz |
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Rated Current |
32A~800A |
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Number of Levels |
3P/4P |
Shop power distribution: Convenience stores, restaurants, etc. that require dual power supply but have limited budgets.
Small residential areas: Lighting for residential buildings, property management, etc. for secondary loads.
Small factories: Auxiliary power supply for non-critical production lines.
Small photovoltaic systems: Grid connection for mains power and photovoltaic power generation systems.
Junray Electrical is a certified manufacturer with a comprehensive quality assurance system. Our key certifications include:
ISO 9001 – International quality management system certification, ensuring consistent product quality and continuous improvement.
CE – Conformity with European health, safety, and environmental protection standards, enabling our products to enter the EU market.
CCC – China Compulsory Certification, mandatory for electrical products sold in the Chinese market.
CQC – China Quality Certification, demonstrating compliance with national standards for electrical safety and performance.
CNAS – China National Accreditation Service for conformity assessment, validating our in-house testing and calibration capabilities.
All ATS Dual Power Automatic Transfer Switches are manufactured and tested in compliance with the applicable standards of these certifications, ensuring reliable performance, consistent quality, and smooth project acceptance.
Standard Warranty: 24 months from the date of commissioning.
Extended Warranty: Optional extended warranty up to 60 months available upon request.
Technical Support: 7×24 hours global rapid response. Our team provides remote technical guidance during installation and commissioning, and responds to all technical inquiries within 24 hours.
Spare Parts: Common spare parts are available for fast dispatch to minimize equipment downtime.
I. Project Background
This project involves the low-voltage power distribution retrofit of an urban commercial complex. The building houses "Level 2" critical loads, including retail shops, public lighting, fire exhaust systems, emergency evacuation systems, and low-voltage equipment rooms. The original distribution system relied on a single utility power feed without a backup power transfer mechanism. Consequently, grid maintenance, line faults, or momentary voltage drops resulted in total power loss across the section, causing sudden equipment shutdowns, failure of fire emergency systems, elevator entrapment, and interruptions in surveillance recording. These issues posed significant fire safety risks and failed to meet emergency power supply standards for commercial buildings.
To ensure uninterrupted power supply for fire safety and public emergency loads, CB-class Automatic Transfer Switches (ATS) are being installed in all emergency distribution boxes and fire power cabinets. These units utilize a dual-circuit-breaker configuration to enable automatic switching between main and backup power sources, ensuring seamless transfer during outages and compliance with fire safety acceptance and commercial operational standards.
II. Pre-Retrofit Issues
Single power source with no redundancy; power loss leads to immediate shutdown: Lack of backup power switching meant that grid fluctuations or line faults caused immediate power loss to emergency lighting, smoke exhaust fans, and surveillance systems.
Non-compliant fire safety systems: Fire fans and emergency lighting lacked automatic backup power, violating the "Code for Fire Protection Power Supply in Buildings" and failing to pass fire safety inspections.
High risk and slow speed of manual switching: The absence of automatic transfer devices required manual switching during outages; slow response times made it impossible to effectively handle sudden power failures.
Momentary voltage fluctuations caused equipment crashes: Grid voltage dips and momentary outages led to low-voltage equipment restarts, data loss, and frequent malfunctions of commercial equipment.
Lack of overload and short-circuit protection; poor safety: Traditional transfer devices performed switching without protection, failing to automatically isolate faulty circuits and creating a risk of cascading trips.
III. Equipment Configuration Plan
Based on the power supply characteristics of the commercial complex's Level 2 loads, fire safety regulations, and budget considerations, CB-class Automatic Transfer Switches have been selected for the entire project. These units feature a configuration combining two miniature circuit breakers with mechanical and electrical interlocking, providing both protection and switching capabilities suitable for fire exhaust systems, emergency lighting, and general backup power loads.
Key Equipment Specifications
Model: CB-class Automatic Transfer Switch (ATS) (Circuit Breaker-based ATS)
Rated Voltage: AC 380V/220V (Low-voltage power distribution systems)
Rated Current: 63A–125A (Suitable for emergency power and lighting loads across building floors)
Structure: Dual-circuit breaker configuration with built-in overload and short-circuit protection
Switching Mode: Configurable for "Auto-transfer/Auto-restore" or "Auto-transfer/Non-auto-restore"
Interlocking: Mechanical forced interlock plus electrical interlock (prevents parallel short-circuiting of the two power sources)
Switching Time: 0.5–2 seconds (Meets non-interruption requirements for standard emergency loads)
Compatible Loads: Grade II fire safety loads, emergency lighting, exhaust equipment, mall utility power, and low-voltage/ELV systems
IV. Construction & Application Highlights
Integrated Circuit Breaker Protection (High Safety): The primary advantage of the CB-class ATS is its integrated MCB protection, featuring automatic tripping for overloads and short circuits; it protects against faults before switching, preventing fault propagation.
Dual Mechanical & Electrical Interlocking (Eliminates Parallel Risks): Ensures the two power sources can never close simultaneously, structurally eliminating the risk of parallel short-circuit accidents.
Cost-Effective (Suitable for Grade II Loads): Lower cost and simpler maintenance compared to PC-class integrated ATS units; ideal for Grade II emergency loads in malls, commercial buildings, and factories.
Automatic Voltage Detection & Intelligent Switching: Automatically detects loss of voltage, undervoltage, or phase loss in the main supply; rapidly switches to the backup source and automatically restores the connection when main power returns—enabling fully unattended operation.
Universal Installation & Easy Retrofitting: Modular cabinet installation requires no changes to the main circuit structure, making it suitable for retrofitting older cabinets or adding emergency power distribution systems.
V. Operational Performance After Retrofit
Automatic Switching During Power Outages (Zero Interruption for Emergency Loads): Emergency lighting, smoke exhaust fans, and surveillance systems continue to operate without blackout or system shutdown during grid flickers or maintenance-related outages.
Automatic Fault Protection (Prevents Propagation): In the event of a branch circuit short circuit or overload, the circuit breaker trips first to provide protection, ensuring the upstream power supply and other circuits remain unaffected. Fully compliant with fire safety acceptance standards: The logic for the fire safety backup power supply is comprehensive and the switching mechanism is reliable, ensuring successful passage of the specialized acceptance inspection for fire safety electrical systems.
Stable operation with zero false operations or failures to act: Precise switching occurred during multiple grid fluctuation and power outage tests, with no instances of incorrect switching, mechanical jamming, or overheating faults.
Low O&M costs and high cost-efficiency: Features a simple structure, low failure rate, and universal parts compatibility, significantly reducing long-term maintenance and replacement costs.
VI. Case Summary
CB-class dual-power transfer equipment is the standard choice for secondary emergency loads, general fire safety loads, and backup power distribution in commercial buildings and shopping malls. Composed of two circuit breakers, it features built-in protection, the ability to interrupt fault currents, and high cost-performance; it differs from PC-class equipment (which is an integrated unit without built-in protection, offers faster switching, and is used for primary loads). Balancing safety and cost-efficiency, CB-class equipment is the most widely used and reliable choice for acceptance inspections in building emergency power distribution, retrofitting of aging systems, and fire safety system upgrades.
Q: What is the main difference between CB-level and PC-level dual power supplies?
A: The main difference lies in the protection functions and price. CB-level (like this product) consists of circuit breakers and comes with overload and short-circuit protection. It is cheaper and suitable for general loads; PC-level is composed of disconnectors and does not have short-circuit protection capability (requires an external fuse); it has a faster switching speed and is more expensive, suitable for core loads. For most ordinary scenarios, CB-level is the most cost-effective choice.
Q: Can this switch be installed in an ordinary distribution cabinet?
A: The ATS Dual Power Automatic Transfer Switch-CB adopts a standardized structural design, with a compact size and low space occupation. It can be easily installed in standard distribution boxes or control cabinets, and the installation method is similar to that of a regular circuit breaker, which is very convenient.
Q: Is custom current and pole count supported?
A: Yes. We can customize current levels ranging from 32A to 800A according to your project requirements, as well as pole configurations of 3P or 4P, to perfectly meet your dual power switching needs.
Why choose Junray Electrical?
By choosing Junray Electrical, you benefit from a professional team of 50 people, including 5 dedicated quotation engineers, who can offer you fast and precise customized services. We guarantee a global rapid response of 7×24 hours. If you are looking for an economical, self-protective and reliable ATS Dual Power Automatic Transfer Switch-CB, don't hesitate any longer. Contact us immediately to get free technical consultation and quotations, and let Junray Electrical build a safe, economical and efficient power distribution system for you.
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No. 318, Weidian Road, Economic Development Zone, Yueqing City, Zhejiang Province, China
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