Products Switchgear Automatic Transfer Switch

ATS-315A/4p Dual Power Automatic Transfer Switchgear

Material: Carbon steel
Color: Gray
Place of Origin：ShanXi, China
Application：Generator distribution
Product Category: Automatic Transfer Switch

This unit is a 315A 4‑pole automatic transfer switch (ATS) engineered for 3‑phase 4‑wire low‑voltage distribution systems. It delivers reliable switching between two power sources and supports automatic transfer between mains‑to‑mains and mains‑to‑generator power supplies. Transfer modes include automatic return and non‑automatic return. Designed as a PC‑level device with high short‑circuit withstand capacity in compliance with IEC 60947‑6‑1, it ensures power continuity for critical loads. The enclosed cabinet structure allows installation in both indoor and outdoor environments.

Rated Voltage: AC 400V (3‑phase 4‑wire)
Rated Current: 315A
Poles: 4P (4‑pole)
Short‑circuit Withstand Current: ≥120 kA
Transfer Modes: Automatic return, non‑automatic return, generator interlock
Transfer Time: 6‑150 seconds (adjustable)
Mechanical Endurance: ≥6000 operations
Operating Temperature: ‑20 ℃ ~ 55 ℃
Ingress Protection: IP30 (IP55 available on custom order)
Standards Compliance: IEC 60947‑6‑1, GB 7251

① 4‑pole synchronous switching transfers three‑phase live conductors together with the neutral conductor, eliminating risks caused by neutral‑line faults and meeting power‑supply requirements for high‑safety‑level applications.
② PC‑level high‑withstand construction provides excellent dynamic and thermal stability to resist high short‑circuit current surges for dependable performance.
③ Multiple transfer modes are available to suit diverse site requirements. Generator interlock enables seamless switching between mains and backup power sources.
④ Combined mechanical and electrical interlocks implement “five‑prevention” functions to prevent mis‑operation and protect personnel and connected equipment.
⑤ Wide operating temperature range from ‑20 ℃ to 55 ℃ enables stable operation under high‑humidity and low‑altitude conditions.

Power supply for life‑support equipment such as hospital ICUs and operating rooms;
Servers and network hardware in data centres and telecommunication base stations;
Signalling systems for rail transit and critical equipment at airports and high‑speed‑rail stations;
Emergency lighting and essential power loads in shopping malls and office buildings;
Dual‑power transfer for photovoltaic / energy‑storage grid‑tie systems and microgrids;
Critical production equipment in metallurgical, chemical and other industrial facilities.

Q1: What is the difference between 4P and 3P ATS?
A: A 3P ATS switches only the three phase conductors while the neutral line remains permanently connected. A 4P ATS switches both phase and neutral conductors synchronously, mitigating safety hazards triggered by neutral‑line faults. It is preferred for high‑reliability installations such as hospitals and data centres.

Q2: What load can a 315A rated‑current unit handle?
A: At AC 400V three‑phase conditions, 315A corresponds to approximately 160 kW, suitable for critical loads in large‑scale commercial buildings and industrial workshops.

Q3: Is manual transfer supported?
A: Both manual and automatic operation are available. Manual mode can be activated when automatic mode fails to guarantee power switching under emergency conditions.