ABB ATS022 Automatic Transfer Switch – ATS Series

ABB ATS022 Dual-Source Automatic Transfer Switch: Power Continuity Architecture for Industrial Control Systems

In industrial power distribution, the interval between primary source failure and load transfer to a backup source is not merely an operational inconvenience — it is a deterministic window during which PLCs lose scan cycle integrity, variable-frequency drives trip on undervoltage, and safety relay chains de-energize. The ABB ATS022 is engineered to close that window. As a modular automatic transfer switch within ABB’s ATS Series, the ATS022 monitors two independent AC supply sources continuously and executes a controlled, break-before-make transfer sequence upon detecting a primary source anomaly — voltage sag, phase loss, or complete outage — within a response envelope that preserves downstream equipment state across the majority of industrial load profiles.

The ATS022 is positioned in the low-voltage switchgear segment, designed for integration into standard IEC 60439-compliant distribution boards and motor control centers. Its DIN-rail form factor allows panel builders to allocate minimal cabinet real estate while achieving source redundancy that would otherwise require discrete contactor pairs, auxiliary contact interlocking, and external timing relays. The internal logic of the ATS022 consolidates these functions into a single, factory-calibrated module, reducing wiring complexity and eliminating the timing coordination errors that plague field-assembled transfer schemes.

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Technical Parameters

Hardware Logical Analysis

The ATS022’s internal architecture centers on a continuous dual-channel voltage monitoring circuit that samples both Source 1 and Source 2 independently at a high polling rate. Each channel feeds into a threshold comparator stage calibrated against configurable undervoltage and overvoltage trip points. When Source 1 voltage drops below the lower threshold — or phase asymmetry exceeds the permissible differential — the comparator output triggers the transfer logic sequencer.

The transfer sequencer enforces a dead-band interval between opening the Source 1 contactor and closing the Source 2 contactor. This break-before-make discipline is not merely a safety interlock; it prevents the momentary paralleling of two unsynchronized AC sources, which would generate destructive circulating currents through the load bus. The dead-band duration is factory-set but may be field-adjustable depending on firmware variant, allowing system integrators to balance transfer speed against load sensitivity.

EMC performance is addressed through the module’s internal layout: the power-path conductors are physically separated from the control and monitoring circuitry, and the PCB incorporates common-mode chokes and transient voltage suppression (TVS) diodes on the voltage sensing inputs. This architecture ensures that high-frequency conducted interference — common in environments with variable-speed drives and switching power supplies — does not corrupt the voltage measurement and trigger spurious transfers.

The auxiliary contact outputs are galvanically isolated from the main power path, providing clean dry-contact signals to PLC digital input modules or SCADA systems without requiring external isolation relays. This simplifies panel wiring and eliminates a common source of ground loop interference in mixed-voltage control cabinets.

Thermal management within the ATS022 relies on the natural convection characteristics of the DIN-rail enclosure combined with the low self-heating of the solid-state monitoring stage. The main switching elements — electromechanical contactors — are rated for the full thermal duty cycle at the module’s rated current, with derating curves published in the ABB technical documentation for elevated ambient temperature installations.

System Integration Benefits

• Deterministic Transfer Timing: The factory-calibrated transfer sequencer delivers consistent switching intervals across the operational temperature range, eliminating the timing drift that affects discrete relay-based transfer schemes assembled from individual components.
• Reduced Panel Wiring Complexity: Consolidating source monitoring, interlock logic, and transfer actuation into a single DIN-rail module reduces terminal block count and inter-device wiring by a measurable margin compared to equivalent discrete implementations.
• PLC Feedback Integration: Galvanically isolated auxiliary contacts provide Source 1 active, Source 2 active, and transfer-in-progress status signals directly to PLC digital input cards, enabling the control program to log transfer events, trigger alarms, and adjust process setpoints during backup-source operation.
• SCADA Diagnostic Transparency: Status contact outputs allow SCADA systems to timestamp each transfer event with millisecond resolution, building a historical record of source reliability that supports predictive maintenance scheduling and utility performance auditing.
• Compatibility with ABB Ecosystem: The ATS022 integrates without additional interface hardware into distribution boards populated with ABB S200/S800 series MCBs, AF/A series contactors, and CM series monitoring relays, preserving a single-vendor BOM for panel certification purposes.
• Reduced Commissioning Time: Factory-set default parameters cover the majority of standard industrial applications, allowing commissioning engineers to verify operation with a simple source-interruption test rather than iterating through relay timing adjustments.
• Fault Isolation Architecture: The module’s internal design ensures that a failure of the monitoring electronics does not affect the main power path — the transfer contacts remain in their last commanded position, preventing an internal fault from causing an uncontrolled load interruption.
• Scalable Redundancy: Multiple ATS022 modules can be deployed within a single distribution board to provide independent transfer switching for segregated load groups — critical loads, non-critical loads, and UPS-backed circuits — each with its own source priority logic.

Quality Assurance & Global Logistics

Every ABB ATS022 unit supplied through siemensplc.com is sourced from verified ABB-authorized distribution channels. Each unit carries ABB’s original factory labeling, batch traceability codes, and is accompanied by documentation confirming its provenance within ABB’s supply chain. We do not handle gray-market or refurbished stock; all units are new, original, and covered by a 12-month warranty from the date of shipment.

Pre-shipment inspection at our Xiamen facility includes visual verification of packaging integrity, label and serial number cross-check against procurement documentation, and functional continuity verification of auxiliary contact outputs. Units that do not pass inspection are quarantined and returned to the supply chain — they are not shipped to customers.

Logistics from Xiamen, China to global destinations are handled through established partnerships with DHL Express, FedEx International Priority, UPS Worldwide Express, and sea freight consolidators for high-volume orders. Standard express shipments to Europe, the Middle East, and Southeast Asia typically transit in 3–7 business days. North American destinations are served within 5–10 business days via express air. All shipments include full tracking, commercial invoice, packing list, and certificate of origin documentation to support customs clearance.

For project procurement requiring phased delivery, we maintain forward stock allocation agreements that allow customers to reserve inventory against confirmed purchase orders with flexible call-off schedules. This is particularly relevant for EPC contractors and panel builders managing multi-site rollouts with staggered installation timelines.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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