Dual Power Automatic Transfer Switch

Automatic dual-source power switching modules for critical control and automation loads, designed to transfer the load from the preferred source to a standby source when the primary supply becomes abnormal, helping maintain power continuity in power-system and industrial control circuits.

Product Capability

Automatic source supervision and transfer for critical control loads, with product options ranging from compact relay-based switching to high-current, near-interruption-free DC transfer.

Automatic dual-source transfer: monitors the availability of two supply paths and transfers the load to the standby source when the preferred source falls outside the permitted operating condition.
Preferred-source restoration: supports automatic return to the preferred source after the source recovers and satisfies the required recovery condition, reducing the need for manual intervention.
Critical-load continuity: the RUS-326 platform is intended for control-system and DCS-type loads where even a short power interruption can cause I/O reset, communication restart, or loss of process availability.
High-current DC switching capability: the RUS-326 application configuration supports a 16 A rated switching current and short-duration current capability for grouped cabinet loads and capacitive inrush conditions.
Fast transfer architecture: ODES application material specifies a 0 ms transfer target for the DC switching configuration, with output voltage maintained during the transfer process to reduce load disturbance.
Status and alarm integration: source-loss and device-status signals can be brought into DCS, PLC, SCADA, or cabinet alarm circuits so operators can distinguish supply faults from downstream equipment faults.
Compact relay-based option: the PDR/AM Series provides a smaller automatic transfer solution for applications where the load and contact requirements are lower and a relay-contact switching architecture is appropriate.
Application-oriented configuration: source voltage, transfer threshold, load current, inrush, return logic, alarm contacts, installation method, EMC requirements, and project documentation should be confirmed against the final model and order code.

Customer Value

Improves control-power availability by turning two independent power sources into a managed redundant supply path with clear transfer logic, status indication, and maintainable modular hardware.

Reduce unexpected control-system shutdowns caused by loss of a single DC supply by automatically transferring critical loads to the standby source.
Protect DCS, PLC, remote I/O, communication, protection, and automation devices from avoidable resets by selecting the transfer platform according to the load sensitivity and permissible interruption time.
Simplify redundant power architecture with a defined preferred/standby relationship instead of relying on manual switching or improvised relay combinations.
Improve fault diagnosis by providing independent status/alarm outputs for source loss and device condition, allowing the supervisory system to identify the origin of a supply event more quickly.
Handle cabinet-group loads more confidently by considering steady-state current, capacitive inrush, short-circuit withstand, and transfer behavior as part of the product selection process.
Reduce maintenance workload through automatic transfer and automatic restoration while retaining clear operating status for periodic functional testing.
Support standardized cabinet design through DIN-rail/module-type products that can be integrated into DCS power panels, protection/control panels, switchgear control compartments, and industrial automation cabinets.

Product Series

Product series are configured according to users' usage and configuration preferences.

RUS-326 Series

High-reliability DC automatic transfer module

Automatic dual-DC-source transfer platform for critical control-system loads. ODES application material describes a fast-transfer configuration with source-voltage supervision, automatic transfer/return, output-voltage support during transfer, high current capacity, and independent alarm/status outputs.

PDR/AM Series

Compact relay-based automatic transfer

Compact automatic transfer module for dual-source control-power applications using relay contact switching. The current ODES product page shows PDR/AM-2DPDT-220V as a representative configuration; exact contact rating, source logic, and transfer time depend on the selected order code.

View technical parameters by product series.

RUS-326 Series - DC Automatic Transfer Module

Parameter (RUS-326)	Data (RUS-326)	Remarks (RUS-326)
Representative model	RUS-326	Model shown on the current ODES product page.
Rated input voltage	110 / 220 VDC	ODES application material gives 110/220 VDC as the reference configuration; confirm the final voltage code.
Input tolerance	±15%	Reference application value; verify against the final product manual.
Transfer threshold	75-80% of rated voltage	Reference undervoltage transfer threshold used in ODES DCS application material.
Transfer logic	Preferred/standby automatic transfer; automatic return	Confirm preferred-source priority and restoration delay requirements during project selection.
Transfer time	0 ms reference transfer target	ODES application material describes interruption-free / 0 ms DC transfer for the selected configuration; verify final hardware version.
Output during transfer	Approximately 90-95% of rated voltage	Reference value describing output-voltage support during source transfer.
Rated switching current	16 A	Reference DC switching configuration.
Short-duration current	25 A maximum	Reference transient current capability; actual permissible duration must follow the product manual.
Short-circuit withstand	600 A, 10 ms half-cycle	Reference application value.
Breaking capability	1000 A / 25 operations, resistive load	Reference application value; protection coordination must be confirmed for the project.
Status / alarm outputs	Source loss, device fault, Source I loss, Source II loss	Independent dry-contact alarm concept described in ODES application material.
Operating temperature	-20 °C to +55 °C	Reference application value.
Relative humidity	5-95% RH	Confirm condensation restrictions in the final manual.
Enclosure protection	IP40 or higher reference configuration	Verify the final enclosure and installation arrangement.
EMC	EFT / ESD / Surge Level 4; ±4 kV reference level	Confirm exact test ports and test levels in the current product report.
Installation	DIN-rail / cabinet integration, configuration dependent	Confirm dimensions, rail type, spacing, and wiring orientation before panel release.
Product function	Automatic transfer between two DC power sources	For critical control, automation, DCS, PLC, I/O, communication, and similar DC loads.

PDR/AM Series - Compact Automatic Transfer Module

Parameter (PDR/AM)	Data (PDR/AM)	Remarks (PDR/AM)
Representative model	PDR/AM-2DPDT-220V	Model marking visible on the current ODES product page.
Representative voltage	220 V version shown	Other voltage versions, if required, must be confirmed by order code.
Contact arrangement	2DPDT	The representative model code indicates two double-pole double-throw contact groups.
Source architecture	Two supply sources / one selected load path	Automatic transfer function is defined by the product category; exact terminal logic must follow the wiring diagram.
Transfer / return logic	Automatic transfer; configuration dependent	Confirm source priority, pickup/dropout threshold, return behavior, and delay requirements before ordering.
Contact rating	Model / order-code dependent	Do not select the device until continuous load current and inrush characteristics are checked against the manual.
Transfer time	Model / order-code dependent	Relay-contact transfer is not intended to be assumed equivalent to the 0 ms RUS-326 configuration.
Status indication	Front status indication provided on representative product	Exact indication logic should be confirmed from the selected model manual.
Mounting	Cabinet / DIN-rail style module; verify final model	Confirm mechanical dimensions and installation requirements before panel design freeze.
Environmental / EMC rating	Model / project dependent	Use the current instruction manual and applicable test report for tender or compliance documentation.

Resources & FAQ

Datatype - Download
Product Catalog
Installation Drawing
Datasheet
Wiring Diagram
Product Certification Report

Frequently Asked Questions

Q1. How should I choose between RUS-326 and PDR/AM?

Start with the load sensitivity and current level. Use RUS-326 when the application requires a high-reliability DC transfer architecture, higher load current, controlled undervoltage transfer, and minimal interruption for DCS/PLC/automation loads. Use PDR/AM when the load is smaller and a relay-contact automatic transfer solution is acceptable. Always verify continuous current, inrush, permissible interruption time, source voltage, and alarm requirements before final selection.

Q2. Does a dual-power automatic transfer module replace a UPS?

Not necessarily. The device transfers the load between two available sources; it does not create energy when both sources are lost. If the load requires ride-through during loss of both upstream sources, battery-backed DC, UPS, or another energy-storage source is still required. The transfer module should be treated as part of the redundancy architecture, not as a substitute for stored-energy backup.

Q3. What information should be provided before ordering?

Confirm Source I and Source II nominal voltage and tolerance, preferred-source logic, transfer and return thresholds, required delay, load continuous current, startup/inrush current, allowable voltage dip or interruption, downstream protection, alarm/status contacts, installation space, environmental conditions, EMC requirements, and any certification or tender-document needs. For DCS or grouped cabinet loads, provide a load list so the total steady-state and transient demand can be checked.

The current ODES product page shows RUS-326 and PDR/AM-2DPDT-220V as representative products under Dual Power Automatic Transfer Switch. The detailed RUS-326 values in this draft are based on ODES internal DCS dual-power transfer application material and should be verified against the latest product manual, drawing, and order code before public release. For PDR/AM, only the representative model marking and 2DPDT / 220 V configuration are confirmed from the current webpage; contact rating, transfer time, thresholds, dimensions, EMC, and certification scope should be completed from the latest instruction manual before publication or ordering.