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Automatic Transfer Switches
3 Series · 23 Models
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Automatic Transfer Switches Overview
Automatic Transfer Switches (ATS) automatically transfer the load from the normal power source to an emergency or standby source and back again. QDTB ATS units are rated 630–1600 A in PC-class and CB-class construction, with transfer times of 0.1–2 s, providing reliable source switching for data centers, hospitals, industrial plants and commercial buildings.
Available Series
PC Class Series
The PC-class (Power Contactor / integrated) automatic transfer switch uses a dedicated, integrated switching mechanism that makes and breaks both power circuits directly. Rated 630–1600 A, it transfers between normal and emergency sources in 0.1–2 s and withstands short-circuit currents without depending on an upstream circuit breaker for isolation, making it suitable for critical and high-capacity loads.
CB Class Series
The CB-class (Circuit Breaker) automatic transfer switch uses two mechanically and electrically interlocked circuit breakers to switch between normal and emergency sources. Rated 630–1600 A, it provides source transfer with full short-circuit protection from the circuit breakers themselves, in a compact and cost-effective arrangement for commercial and industrial standby power.
Dual-Source Complete Cabinet Series
The dual-source complete ATS cabinet is a factory-assembled, pre-wired switchgear lineup that packages two incoming circuit breakers, one automatic transfer switch and a feeder section into a single ready-to-connect cubicle. It provides automatic mains-to-backup changeover with mechanical and electrical interlocking, saving on-site wiring time and guaranteeing a consistent, type-tested assembly for critical loads.
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| Base price (interpolation) | $1,475 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Complete equipment — no winding copper linkage
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Application Scenarios
Data Centers & Telecom
Reliable transfer between utility and backup generator or UPS sources.
Hospitals & Healthcare
Seamless switching of life-safety and essential power circuits.
Industrial Plants
Continuous-production power with automatic source transfer.
Commercial Buildings
Standby generator transfer for offices, malls and hotels.
Technical Advantages
PC-Class Construction
Integrated switching mechanism rated to withstand short-circuit current.
CB-Class Construction
Two interlocked circuit breakers providing switching and protection.
630–1600 A Ratings
From medium distribution boards to high-capacity main switchboards.
0.1–2 s Transfer
Programmable transfer time coordinated with source start-up.
FAQ - Automatic Transfer Switches
What is an automatic transfer switch?
What is the difference between PC-class and CB-class?
How fast does an ATS transfer?
Which ratings are available?
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