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Automatic Transfer Switch

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Product Overview & Technical Specifications

 

Engineered for continuous power availability, this Automatic Transfer Switch monitors dual power sources and executes seamless source transitions during utility failure. Built for direct integration into low-voltage switchgear, motor control centers (MCC), and emergency power distribution panels.

 

Technical Parameter

Specification Range

Compliance / Standard

Rated Operational Current (Ie)

16A to 3200A

IEC 60947-6-1, UL 1008

Pole Configuration

2-Pole, 3-Pole, 4-Pole (Neutral switching available)

-

Rated Operational Voltage (Ue)

AC 400V / 415V / 690V (50Hz / 60Hz)

-

Transfer Mechanism

Motor-driven, solenoid-actuated (PC Class / CB Class)

-

Transition Type

Open transition (I-0-II), Delayed transition, Closed transition

-

Rated Short-Time Withstand Current (Icw)

10kA to 85kA (0.1s to 1.0s)

IEC 60947-6-1
 
 
Generator Automatic Transfer Switch

 

Selection Guide: PC Class vs. CB Class

Selecting the correct switch class determines fault-clearing capability and system architecture.

 

PC Class (Load Break): Rated for making and breaking currents but lacks overcurrent release. Relies on upstream protective devices (MCCB/ACB) for short-circuit clearance. Features high short-time withstand current (Icw) and faster mechanical transfer times. Applied in critical data centers and heavy industrial switchboards.


CB Class (Circuit Breaker): Integrated with overcurrent release mechanisms. Combines switching and circuit protection functions within a single unit. Applied in commercial backup systems where footprint and integrated protection are prioritized.

 

 
Engineering Integration & Mechanical Compatibility
 

Designed to streamline installation for panel builders and switchgear fabricators:

01/

Enclosure & Mounting: Compact footprint optimized for standard floor-standing or wall-mounted enclosures; customizable mounting plates available upon request.

02/

Terminal Design: Silver-plated copper busbar terminals with generous phase-to-phase clearance, compatible with standard cable lugs and rigid busbar connections.

03/

Communication Protocols: Standard RS485 port supporting Modbus RTU protocol, enabling seamless integration into third-party PLC, SCADA, or building management systems (BMS).

04/

Auxiliary Contacts: Pre-configured with volt-free auxiliary contacts (NO/NC) for remote status monitoring of source availability and switch position.

 

Manufacturing Capability & Quality Control

 

Sheet Metal Fabrication

Enclosures and internal structural frames processed via Trumpf CNC laser cutting and AMADA CNC bending machines, maintaining dimensional tolerances within +/- 0.1 mm.

01

Contact Material

Main switching contacts utilize AgCdO (Silver Cadmium Oxide) or AgSnO2 (Silver Tin Oxide) composite materials, resistance-welded to copper substrates to resist electrical arc erosion and contact welding.

02

Coil & Actuator Production

Automatic copper wire winding machines and vacuum impregnation lines ensure consistent magnetic coil impedance and thermal class insulation (Class H).

03

Functional & Routine Testing

Every assembled ATS undergoes automated routine testing (ATE) measuring transfer time, dielectric strength (2500V/1min), micro-ohm contact resistance, and control logic verification under simulated phase-loss conditions. Test reports accompany every shipment.

04

 

Application Environments

Healthcare Facilities

Complies with mandatory emergency power restoration timelines for operating theaters and ICU life-support systems.

 

Telecommunications

Dual-utility automatic switching for unattended cellular base stations running on 48V DC / AC inverter architectures.

 

Industrial Continuous Processes

Prevents costly production downtime in chemical plants and semiconductor manufacturing lines by transferring to emergency generators within milliseconds.

 

 

FAQ

 

Q: What is the difference between open transition and closed transition transfer?

A: Open transition (break-before-make) disconnects from the primary source before connecting to the secondary source, creating a brief dead band (typically 50ms to 500ms). Closed transition (make-before-break) momentarily parallels both sources for less than 100ms, eliminating power interruption, provided both sources are synchronized in phase, voltage, and frequency.

Q: Can this ATS handle motor loads with high inrush currents?

A: Yes. The switch is rated for AC-33B utilization category, accommodating inductive motor loads that draw locked-rotor currents up to 6 times the rated operational current without contact degradation.

Q: What control logic options are available for generator integration?

A: Standard controllers feature programmable parameters for voltage pickup/dropout thresholds (85% to 95% undervoltage), time delays for engine start (0-30s), transfer to emergency (0-60s), retransfer to utility (0-30min), and engine cool-down running time (0-30min). RS485 / Modbus RTU communication ports are built-in for SCADA integration.

Q: What certifications do these units carry for export to North America and Europe?

A: Units destined for European markets comply with IEC 60947-6-1 and carry CE marking. North American specifications comply with UL 1008 standards, featuring specific electrical clearance and creepage distances, withstand testing logs, and CSA certification options upon request.

Q: What is the mechanical and electrical lifespan of the switching mechanism?

A: Designed for heavy industrial deployment, mechanical endurance exceeds 10,000 to 50,000 operating cycles (depending on current rating), and electrical endurance exceeds 1,500 to 6,000 cycles under rated operational current (Ie) at cos(phi) = 0.65.

Q: What is the standard lead time for bulk orders and OEM customization?

A: Standard catalog models (16A-630A, 4-pole, 400V) ship within 15 to 20 days. Custom enclosure integration, specialized control logic programming, or ratings above 1000A require 30 to 45 days. Factory inspection reports and individual test sheets accompany every shipment.

 

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Technical Resources & Commercial Support

Standard Warranty: 2-year full replacement or repair warranty backed by complete material traceability and batch-controlled component testing.
Action Call (CTA):
[Download Complete IEC / UL Datasheet & Wiring Diagrams (.PDF)]
[Request 2D/3D CAD Files for Panel Layout]
[Submit Project Specifications for Bulk Quotation / OEM Customization]

As one of the most experienced automatic transfer switch manufacturers and suppliers in China, we also support customized service. We warmly welcome you to buy high quality automatic transfer switch from our factory. If you have any enquiry about pricelist, please feel free to email us.