GRUS Series | Protection & Control

GRUS Protection & Control Relay Platform

A standardized relay platform for critical power-system secondary circuits, covering PT/VT voltage switching, auxiliary-supply supervision, high-speed tripping, lockout retention, and trip-circuit supervision.

Product Capability

Covers the protection-and-control auxiliary functions most frequently required around relay panels and breaker trip circuits, while keeping product structure, panel integration, status indication, and maintenance philosophy standardized across the GRUS platform.

Five core secondary-circuit functions in one platform: GRUS-11G handles PT/VT voltage-source switching, GRUS-RTU supervises auxiliary/control power, GRUS-11H provides fast trip output, GRUS-11TA provides retained lockout, and GRUS-TCS supervises trip-circuit continuity.
Protection-trip performance options: GRUS-11H is available for high-speed trip duties, including Low Burden and High Burden configurations for different protection-output philosophies and long-cable interference conditions.
Controlled post-fault lockout: GRUS-11TA holds the trip/blocking state after protection operation until a defined reset is performed, with local and remote reset options available by configuration.
Continuous circuit readiness supervision: GRUS-TCS monitors the integrity of breaker trip circuits through breaker open and closed states and can alarm on open-circuit, coil-circuit, supply, or wiring abnormalities.
Auxiliary-supply supervision with anti-chatter behavior: GRUS-RTU supports AC/DC supply monitoring and delayed return logic to filter short voltage dips and reduce nuisance alarms.
PT/VT source-selection logic: GRUS-11G follows isolator/disconnector position signals to select the appropriate secondary voltage source in dual-busbar and related multi-PT schemes, with single-position and double-position logic options.
Standardized panel integration: the GRUS platform uses a consistent modular structure with front status indication, protective cover and identification area, supporting repeatable panel engineering and clearer field inspection.
Service-friendly replacement philosophy: the platform is designed so a module can be removed for inspection or replacement without rebuilding the existing field wiring, reducing maintenance disturbance to the surrounding circuit.
High-density cabinet arrangement: platform material specifies that up to eight units can be arranged side by side on a standard 19-inch 5U panel, supporting compact protection-and-control cabinet layouts.
Engineering-oriented terminals: platform terminal design supports two 2.5 mm² conductors, helping accommodate common secondary-circuit wiring practices and loop-through connections.

Customer Value

Standardizes critical secondary-circuit functions around protection and breaker control, helping EPCs, panel builders, utilities, and industrial users reduce design variation, improve fault visibility, simplify commissioning, and maintain clearer safety boundaries throughout the equipment lifecycle.

Reduce engineering fragmentation by selecting multiple protection-and-control auxiliary functions from one standardized relay platform instead of combining unrelated components with different mounting, indication, and maintenance philosophies.
Improve protection reliability by matching the relay function to the actual circuit task: fast trip for rapid breaker operation, lockout for retained blocking, supervision for hidden trip-circuit faults, supply monitoring for auxiliary-power abnormalities, and PT switching for correct voltage-source selection.
Reduce nuisance alarms and unwanted operations through application-specific delay, High Burden, anti-chatter, and fail-safe options where required by the project circuit.
Simplify FAT, SAT, troubleshooting, and O&M because operating status is visible locally and each module has a clear functional boundary within the secondary circuit.
Support international project documentation through available IEC-tested and CE-certified GRUS variants; the exact certification scope must be confirmed by model and order code.
Improve cabinet standardization and project replication through common mechanical philosophy, repeatable terminal planning, and high-density panel arrangement.
Reduce maintenance time by allowing module inspection or replacement with minimal disturbance to established field wiring and adjacent circuits.
Support both conventional and more demanding protection schemes with model-specific choices for circuit count, contact matrix, burden class, reset philosophy, alarm logic, and rated control voltage.

Product Series

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

GRUS-11G

Dual-busbar PT / VT voltage switching

Selects the correct PT/VT secondary source according to isolator/disconnector position logic for protection, measurement, metering, synchronizing, and control circuits. Supports single-position and double-position switching philosophies, auxiliary status outputs, voltage-loss alarm interfaces, and front status indication.

GRUS-RTU

AC/DC auxiliary power-supply supervision

Monitors control and auxiliary power supplies for loss, undervoltage, or abnormal fluctuation. Dual independent supervision loops, delayed return, configurable alarm logic, and common AC/DC voltage versions help reduce nuisance alarms while keeping supply faults visible.

GRUS-11H

High-speed trip output

Fast auxiliary trip relay for protection outputs, breaker trip circuits, remote trip, intertrip, and contact multiplication. Low Burden and High Burden configurations are available, with single- or multi-circuit arrangements depending on project requirements.

GRUS-11TA

Lockout / trip-hold relay

Maintains a trip or blocking state after protection operation until reset, helping prevent unintended reclosing and preserve post-fault operating discipline. Supports local/remote reset, flexible contact matrices, and High Burden configurations.

GRUS-TCS10 / GRUS-TCS30

Trip circuit supervision

Continuously supervises breaker trip-circuit integrity in both breaker open and closed states. TCS10 is used for grouped supervision and TCS30 for per-phase supervision, with selectable alarm-contact logic and delayed return to avoid transient nuisance alarms.

View technical parameters by product series.

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

Parameter(GRUS-11G)	Data(GRUS-11G)	Remarks(GRUS-11G)
Product model	GRUS-11G	Current ODES product/solution material identifies GRUS-11G as the dedicated dual-busbar PT/VT 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	Final logic must follow the actual primary single-line diagram and approved secondary schematic.
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 philosophy.
Auxiliary outputs	Operating-state / repeat contacts	Used for status indication, interlocking, remote signaling, or additional logic.
Alarm interface	PT / VT voltage-loss or abnormal-state alarm interface by configuration	Coordinate alarm logic with the project PT supervision scheme.
Local indication	Front status indication	Allows direct confirmation of switching status during commissioning and maintenance.
Module replacement philosophy	Removable without rebuilding existing field wiring	Platform feature intended to simplify inspection, troubleshooting, and replacement.
Terminal wiring capacity	Supports two 2.5 mm² conductors	Platform-level wiring capability; verify the final terminal plan for the ordered variant.
Auxiliary supply	Model / project dependent	Confirm rated supply, tolerance, and terminal definition in the latest approved GRUS-11G documentation.
Contact rating / transfer time	Model / contact configuration dependent	Verify current-carrying, making/breaking capability and switching timing against the connected circuit.
Environmental / EMC / certification	Refer to latest approved model documentation	Use only the current model-specific type-test and certification scope in tenders and customer submissions.

GRUS-RTU - Auxiliary Power Supply Supervision Relay

Parameter(GRUS-RTU)	Data (GRUS-RTU)	Remarks (GRUS-RTU)
Product series	Dedicated control/auxiliary power-supply supervision relay for protection and control panels.	GRUS-RTU
Primary function	Detects loss, undervoltage, or abnormal supply state and provides alarm/status outputs.	AC/DC supply supervision
Available monitored voltages	Versions stated in current ODES public product material; confirm exact order code before purchase.	48 VDC, 110 VDC, 125 VDC, 220 VDC, 230 VAC
Operate characteristic	Internal ODES application material states this operating characteristic; verify final tolerance for the ordered model.	Reliable operation at approximately 70% Un
Release characteristic	Internal ODES application material; use the latest manual for final engineering calculations.	Approximately 10% Un
Operate time	Current ODES public product material.	≤20 ms
Return / release delay	Anti-chatter delay filters short voltage dips and transient fluctuations.	200–400 ms
Supervision circuits	Supports dual-supply or partitioned supervision arrangements.	2 independent loops per device
Output contacts	Current ODES public product material for the dual-circuit architecture.	4 × changeover per loop; 8 × changeover total
Output logic	Useful where DCS/SCADA philosophy requires a closed contact under abnormal condition.	Fault-closed option available
Local indication	Allows quick identification of the monitored loop state.	Independent LED status indication
Standards / certification	Confirm the exact type-test and certificate scope for the selected order code.	IEC 60255; IEC 61000; CE
Mounting / dimensions / terminal plan	Confirm the latest outline drawing and terminal allocation before panel production.	Model-specific

GRUS-11H - Fast Trip Relay

Parameter(GRUS-11H)	Data (GRUS-11H)	Remarks (GRUS-11H)
Contact rating / dimensions	Verify the actual trip load, contact making/breaking duty, outline drawing, and terminal map before final design.	Model / order-code dependent
Product series	Fast auxiliary trip relay for protection trip, intertrip, remote trip, and contact-multiplication circuits.	GRUS-11H
Primary function	Transfers the protection command rapidly to breaker trip or downstream auxiliary circuits.	High-speed trip output
Burden options	Select according to protection philosophy, long-cable interference risk, and utility/EPC requirements.	Low Burden / High Burden
Standard operate time	Current ODES public product material for standard fast-trip configuration.	≤5 ms
High Burden operate time	Internal ODES application material; confirm exact value for the selected High Burden order code.	≤10 ms
Return time	Current ODES public material for the standard fast-trip relay.	≤15 ms
Independent circuit options	Internal ODES application material; final circuit count is defined by model/order code.	1, 2, or 3 circuits depending on configuration
Typical dual-circuit output	Representative configuration stated in current ODES public material.	2 coils; each coil with 4 × changeover outputs
Coil voltage options	Current ODES public and internal product material.	110 / 125 / 220 VDC
High Burden anti-interference	High Burden option is intended to reduce unwanted operation from distributed capacitance and spurious signals.	Enhanced immunity to capacitive-discharge / long-cable interference
High Burden reference	Confirm exact test report and order-code applicability before specifying in tender documents.	ESI 48-4 EB2 compliance stated for applicable configuration
Local indication	Supports commissioning, operation-status checking, and event interpretation.	ACT indicators by circuit on representative multi-circuit models
Standards / certification	Confirm model-specific certificate scope.	IEC 60255; IEC 61000; CE for applicable variants

GRUS-11TA - Lockout Trip Relay

Parameter(GRUS-11TA)	Data (GRUS-11TA)	Remarks (GRUS-11TA)
Product series	GRUS-11TA	Lockout and trip-hold relay for protection trip outputs and breaker interlocking circuits.
Primary function	Self-holding trip / lockout and blocking	Maintains the operated state after a protection trip until a defined reset is performed.
Reset options	Local reset and remote reset	Supports controlled recovery procedures and integration with remote operating systems.
Contact output options	4 changeover; 8 changeover; or 6NO + 2NC depending on configuration	Internal ODES application material; select according to interlocking, alarm, SCADA, and repeat-output requirements.
Representative configuration	GRUS-11TA-8R with 8 changeover outputs	Current ODES public project material identifies this configuration for lockout duty.
Coil voltage options	110 / 125 / 220 VDC	Current ODES public product material.
Burden options	Low Burden / High Burden configurations available	High Burden configuration is used where stronger immunity to capacitive-discharge interference is required.
State retention	Operated state retained until reset	Used to prevent unintended reclosing and preserve the post-fault blocking state.
Local indication	Front operating/reset status indication	Supports field confirmation during commissioning and maintenance.
Standards / certification	IEC 60255; IEC 61000; CE for applicable variants	Confirm exact type-test and certificate scope for the ordered model.
Operate / reset time	Model / order-code dependent	Use the latest GRUS-11TA manual where timing participates in a coordinated protection scheme.
Contact rating	Model / output configuration dependent	Confirm continuous current and making/breaking capacity against the actual connected load.
Mounting / dimensions / terminal plan	Model-specific	Freeze the outline drawing and terminal assignment before cabinet production.

GRUS-TCS10 / GRUS-TCS30 - Trip Circuit Supervision Relay

Parameter(GRUS-TCS10 / GRUS-TCS30)	Data (GRUS-TCS10 / GRUS-TCS30)	Remarks (GRUS-TCS10 / GRUS-TCS30)
Mounting / dimensions / terminal plan	Model-specific	Confirm the latest outline and wiring diagram before panel release.
Product series	GRUS-TCS10 / GRUS-TCS30	TCS10 provides grouped supervision; TCS30 provides per-phase trip-circuit supervision.
Primary function	Continuous trip-circuit integrity supervision	Monitors trip contacts, trip coils, breaker auxiliary contacts, control supply, and related wiring.
Breaker-state coverage	Supervision with breaker open and closed	Designed to keep the trip path monitored across normal breaker operating states.
Healthy / operate threshold	>70% Un supports normal supervision	Internal ODES application material; confirm exact tolerance for the ordered model.
Abnormal / alarm condition	<50% Un or trip-circuit abnormality	Internal ODES application material; alarm behavior also depends on selected output logic.
Return / alarm delay	500–1000 ms	Filters transient changes during breaker operation, reclosing, or short disturbances to reduce nuisance alarms.
TCS10 contact options	1NO + 1NC or 2NC	Current ODES public product material.
TCS30 contact options	3NO + 3NC or 6NC	Current ODES public product material.
Failsafe output option	Fault-closed configuration available	Supports DCS/SCADA philosophies that require alarm contacts to close on abnormal condition.
Rated voltage options	110 / 125 / 220 VDC	Current ODES public product material.
Power consumption	Low-power supervision design	Exact burden should be confirmed in the latest model manual for circuit calculations.
Local indication	Front status indication	Aids phase/circuit identification, commissioning, and fault localization.
Standards / certification	IEC 60255; IEC 61000; CE	Confirm certificate scope for TCS10/TCS30 and the actual order code.

Resources & FAQ

Datatype - Download

Frequently Asked Questions

Q1. Which GRUS series should I select for my secondary circuit?

Start from the circuit task. Use GRUS-11G for dual-busbar PT/VT source selection, GRUS-RTU for AC/DC auxiliary-supply supervision, GRUS-11H for fast protection-trip output, GRUS-11TA when the trip/blocking state must remain latched until reset, and GRUS-TCS10/TCS30 when the breaker trip circuit must be continuously supervised. The final suffix and contact configuration should then be selected from the project schematic and load requirements.

Q2. What is the difference between GRUS-11H and GRUS-11TA?

GRUS-11H is selected when the main requirement is to transfer a protection trip command as quickly as possible and, where needed, multiply it to several outputs. GRUS-11TA is selected when the operated state must be retained after the protection event so reclosing remains blocked until a controlled local or remote reset is performed. Both families can have Low Burden or High Burden configurations, but their circuit roles are different: fast command transfer versus retained lockout.

Q3. What information should be provided before final GRUS model selection?

Provide the required circuit function, rated AC/DC control voltage, number of independent channels, required NO/NC/changeover contacts, actual contact load and DC inductive duty, Low Burden or High Burden requirement, PT/VT bus and isolator logic where applicable, lockout reset philosophy, TCS group/per-phase supervision requirement, preferred alarm logic, mounting constraints, terminal/wiring requirements, and the IEC/CE or utility-specific documentation required by the project. ODES should confirm the final order code against the latest product manual, wiring diagram, type-test report, and project technical specification.

The GRUS platform is presented in current ODES company and solution material as a standardized protection-and-control auxiliary relay family covering trip-circuit supervision (GRUS-TCS), power-supply supervision (GRUS-RTU), PT/VT voltage switching (GRUS-11G; earlier portfolio material may abbreviate this as GRUS-11), fast trip output (GRUS-11H), and lockout / trip-hold functions (GRUS-11TA). This draft consolidates current ODES website information with internal product/solution material. Where a parameter is tied to a specific suffix, burden class, contact matrix, circuit count, or certificate, the latest approved instruction manual and order code must take precedence before website publication, tender submission, or ordering.