PT Voltage Switching Device

Dedicated secondary-circuit devices for reliable VT/PT voltage-source selection, transfer, paralleling, position-repeat, and status output in dual-busbar, sectionalized-busbar, and multi-PT power-system schemes.

Product Capability

A standardized PT secondary-voltage control platform that selects, transfers, parallels, and repeats voltage-source logic for protection, measurement, metering, synchronizing, and automation circuits.

Automatic PT source selection: selects the appropriate VT/PT secondary voltage source according to disconnector / isolator position signals in dual-busbar and related multi-source schemes.
Dual-busbar switching logic: supports automatic voltage transfer where protection, measurement, metering, or control devices must follow the busbar to which the primary circuit is connected.
Single-position and double-position logic options: GRUS-11G can be configured around different isolator-position feedback philosophies to match project drawings and operating practices.
PT paralleling and repeat functions: dedicated RUS configurations support PT secondary paralleling, isolator-position repeat, and multi-contact status expansion for auxiliary circuits.
Status and alarm outputs: provides auxiliary contacts for operating-state indication and, where configured, VT/PT voltage-loss or abnormal-state alarm interfaces.
Clear local indication: front-panel status indication helps commissioning and maintenance personnel verify active switching states and circuit conditions at the panel.
Integrated secondary-circuit logic: consolidates switching and repeat functions that would otherwise be implemented with multiple discrete auxiliary relays, reducing wiring complexity and schematic variation.
Application coverage: suitable for protection panels, bay-control / measurement panels, synchronizing circuits, metering circuits, dual-busbar substations, sectionalized busbars, and selected 3/2-bus PT transfer schemes.
Maintainable modular architecture: selected GRUS platform configurations are designed for clear terminal definition and device replacement / maintenance without unnecessary rewiring of the external circuit.

Customer Value

Reduce PT-source selection errors and secondary-circuit complexity while making switching logic easier to standardize, verify, commission, and maintain.

Improve source-selection reliability by linking PT voltage transfer to actual isolator / disconnector position instead of relying on manual selection or loosely coordinated discrete relay logic.
Reduce the risk of protection, measurement, synchronizing, or metering circuits receiving the wrong voltage reference after bus transfer or operating-mode changes.
Simplify schematic design and cabinet wiring by integrating voltage selection, repeat, paralleling, status indication, and alarm interfaces into purpose-built devices.
Standardize repeated projects: a defined PT switching platform makes drawings, terminal plans, FAT checks, commissioning logic, and future replacement more consistent across panels.
Improve maintainability through clearer front indications, dedicated status outputs, and well-defined functional boundaries between PT switching, PT supervision, and upper-level protection / automation logic.
Support different operating philosophies through single-position / double-position switching and separate repeat / paralleling product options rather than forcing one circuit architecture on every project.
Provide a practical upgrade path for legacy PT switching circuits where multiple intermediate relays and hardwired logic can be replaced by a more integrated, application-specific solution.

Product Series

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

GRUS-11G

Dual-busbar PT / VT voltage switching relay

A dedicated dual-busbar voltage-selection relay that switches the PT / VT secondary source according to isolator-position logic. It supports single-position and double-position switching configurations, auxiliary state outputs, voltage-loss alarm interfaces, and clear front status indication.

RUS-11B(S) / RUS-12A

PT isolator-position repeat / auxiliary repeat relays

Repeat-relay configurations used to reproduce PT isolator / disconnector position and expand auxiliary contacts for secondary voltage-selection, indication, and interlocking circuits. Different variants are selected according to the required circuit logic and contact arrangement.

RUS-23A

PT paralleling / repeat relay

A PT secondary-circuit paralleling and repeat device used where voltage sources must be paralleled, transferred, or distributed through repeat outputs as part of a coordinated PT switching scheme. It can be combined with voltage-selection and position-repeat functions according to the project topology.

View technical parameters by product series.

RUS-23A - PT Paralleling / Repeat Relay

Parameter(RUS-23A)	Data(RUS-23A)	Remarks(RUS-23A)
Environmental / EMC performance	Refer to latest approved technical manual and type-test scope	Use only model-specific verified data in customer-facing technical submissions.
Product model	RUS-23A	ODES solution material identifies RUS-23A for PT paralleling / repeat applications.
Primary function	PT secondary paralleling and repeat output	Used where PT voltage sources must be paralleled, transferred, or redistributed under defined operating logic.
Typical application	Sectionalized busbar, dual-busbar, and multi-PT auxiliary circuits	Final use depends on the station voltage-source topology and operating philosophy.
Paralleling function	Supports PT secondary paralleling according to project logic	Interlocking conditions must prevent unintended paralleling of incompatible voltage sources.
Repeat function	Auxiliary status / control repeat outputs	Provides additional contacts for downstream indication, interlocking, monitoring, or control logic.
System role	Works as part of a coordinated PT voltage selection / transfer scheme	Can be combined with GRUS-11G and position-repeat functions where required.
Control inputs	Project logic / position contacts dependent	Define bus-coupler, isolator, breaker, or enable conditions in the approved schematic.
Output-contact matrix	Project / variant dependent	Confirm contact quantity and state required for paralleling and downstream repeat circuits.
Fail-safe / blocking logic	Project dependent	The circuit should define conditions that block incorrect or unsafe PT paralleling.
Auxiliary supply	Model / project dependent	Confirm rated supply and voltage tolerance in the current technical manual.
Contact rating	Model / contact configuration dependent	Check both current-carrying and making / breaking requirements for the connected load.
Operate / release time	Model / logic dependent	Verify timing where the device coordinates with bus transfer or automatic control sequences.
Mounting / dimensions	Model-specific	Confirm latest dimensional drawing and terminal plan before cabinet production.

RUS-11B(S) / RUS-12A - PT Isolator-Position Repeat Relays

Parameter(RUS-11B(S) / RUS-12A)	Data(RUS-11B(S) / RUS-12A)	Remarks(RUS-11B(S) / RUS-12A)
Environmental / EMC performance	Refer to latest approved technical manual	Do not inherit ratings from another RUS / GRUS product without model-specific verification.
Product models	RUS-11B(S) / RUS-12A	ODES PT switching solution material groups these models under PT isolator-position repeat applications.
Primary function	PT isolator / disconnector position repeat	Reproduces primary-device position information for secondary voltage-selection and auxiliary logic.
Typical application	Dual-busbar / multi-PT secondary circuits	Used together with PT voltage-selection, indication, interlocking, and remote-status circuits.
Input type	Isolator / disconnector auxiliary-position contacts	Exact NO / NC input philosophy depends on the project schematic.
Output type	Multiple repeat / auxiliary contacts	Used to expand position information to several protection, measurement, automation, or indication circuits.
Logic role	Position replication and contact expansion	These relays support the switching architecture rather than performing PT voltage measurement.
Circuit compatibility	Configured for different PT secondary-circuit schemes	Select the variant according to number of position signals, required contacts, and panel wiring.
Indication	Configuration dependent	Confirm local indication / mechanical status features for the selected variant.
Auxiliary supply / coil voltage	Model / project dependent	Confirm AC / DC operating voltage and permissible tolerance from the latest product manual.
Contact arrangement	Variant dependent	Freeze NO / NC / changeover quantity before schematic and terminal-plan release.
Contact rating	Variant dependent	Confirm continuous current and making / breaking capacity for the actual connected secondary load.
Operate / release characteristics	Variant dependent	Confirm timing if the repeat contact participates directly in automatic transfer or interlocking logic.
Mounting / dimensions	Model-specific	Confirm panel / embedded / modular mounting method and latest dimensional drawing.

GRUS-11G - Dual-Busbar PT / VT Voltage Switching Relay

Parameter(GRUS-11G)	Data(GRUS-11G)	Remarks(GRUS-11G)
Product model	GRUS-11G	Current ODES solution material identifies GRUS-11G as the dedicated dual-busbar PT switching product.
Primary function	Automatic PT / VT secondary-voltage source selection	Selects the voltage source required by protection, measurement, metering, synchronizing, or control circuits.
Typical bus arrangement	Dual busbar; related multi-PT applications	Selection logic is matched to the actual station primary arrangement and project drawing.
Control basis	Isolator / disconnector position signals	The switching decision follows the position of the associated busbar isolating devices.
Logic options	Single-position and double-position switching	Choose according to the available position contacts and required fail-safe logic.
Voltage-source circuits	One or two PT / VT source groups according to configuration	Exact phase / circuit count and terminal allocation depend on the ordered variant.
Auxiliary outputs	Operating-state / repeat contacts	Used for status indication, interlocking, remote signaling, or auxiliary logic.
Alarm interface	VT/PT voltage-loss or abnormal-state alarm interface available by configuration	Coordinate the alarm logic with the project PT-supervision scheme.
Auxiliary supply	Model / project dependent	Confirm rated auxiliary supply and tolerance in the latest approved GRUS-11G manual / order code.
Contact rating	Model / contact configuration dependent	Confirm continuous current, making / breaking capacity, and inductive-load rating before final design.
Operate / transfer time	Model / logic dependent	Verify required switching timing against the protection, synchronizing, and measurement application.
Mounting / dimensions	Model-specific panel / modular construction	Confirm latest outline drawing, cutout / mounting arrangement, and terminal definition before panel release.
Environmental / EMC performance	Refer to latest approved technical manual and type-test scope	Use the current verified EMC, insulation, temperature, humidity, and altitude data for tender / approval documents.

Resources & FAQ

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

Frequently Asked Questions

Q1. What is the difference between a PT voltage switching relay and a PT paralleling / repeat relay?

A PT voltage switching relay such as GRUS-11G selects which PT / VT secondary source is connected to downstream protection, measurement, metering, synchronizing, or control circuits according to bus / isolator position. A PT paralleling / repeat relay such as RUS-23A is used when the scheme also requires controlled paralleling or additional repeat outputs. Position-repeat relays such as RUS-11B(S) / RUS-12A mainly reproduce isolator-position information and expand contacts for the switching logic. These functions may be used together in one complete PT secondary-voltage scheme.

Q2. What information is required before selecting a PT Voltage Switching Device?

Confirm the primary bus arrangement (single bus, dual bus, sectionalized bus, or 3/2 scheme), number of PT / VT sources, rated PT secondary voltage, phase configuration, isolator / disconnector position-contact philosophy, whether single-position or double-position logic is required, whether PT paralleling is permitted, required repeat / alarm contacts, auxiliary supply, fail-safe behavior, switching timing, mounting constraints, and the terminal interface to protection, metering, synchronizing, and automation devices. The final model and suffix should be frozen against the approved secondary schematic.

Q3. Does a PT voltage switching device replace a PT supervision relay or protection IED?

No. A PT voltage switching device manages voltage-source selection, transfer, paralleling, and related status logic. It does not replace the protection IED, VT/PT itself, or a dedicated voltage-supervision function. Where the project requires undervoltage / voltage-loss supervision, devices such as the ODES WY monitoring relay can provide the voltage-state criterion, while the PT switching device performs the source-selection and transfer task. The two functions should be coordinated in the overall secondary-circuit logic.

The current ODES PT Voltage Switching Device webpage presents this category primarily through product imagery and application positioning rather than indexable model text. Current ODES solution material explicitly maps the category to GRUS-11G for dual-busbar PT switching, RUS-11B(S) / RUS-12A for PT isolator-position repeat, and RUS-23A for PT paralleling / repeat functions. Before website release, quotation, project approval, or ordering, verify the latest instruction manual and order-code definition for rated auxiliary supply, PT circuit arrangement, contact matrix, contact capacity, switching timing, terminal assignment, mounting dimensions, environmental ratings, EMC / insulation performance, and certification scope.