ABB SPAU 121 C Overvoltage and Undervoltage Relay

ABB SPAU 121 C Overvoltage and Undervoltage Relay Supplier and Exporter in India

ABB SPAU 121 C Replacement – REX615 Retrofit

ABB SPAU 121 C is a legacy SPACOM voltage relay. ABB lists the product as not active since 2009, so most current requirements are for an existing relay replacement, matching spare, plant shutdown requirement or modernisation of an old protection panel.

ABB officially includes SPAU 121 C in its SPACOM-to-REX615 Relay Retrofit Program. The retrofit uses an ABB REX615 protection relay together with a retrofit connector arrangement intended to reduce major rewiring during replacement.

For an ABB SPAU 121 C replacement or REX615 retrofit enquiry, please send:

• Complete SPAU 121 C order code
• Clear photograph of the existing relay nameplate
• Rated voltage – 100 V or 110 V
• Auxiliary supply voltage
• Existing settings, if available
• Required quantity
• Destination country

REX615 should not be selected only from the SPAU 121 C model number. The existing voltage input, auxiliary supply, trip contacts, alarm contacts, blocking signals and relay settings should be checked before finalising the retrofit. ABB’s retrofit program also requires application-specific REX615 configuration and settings.

ARP IMPEX handles enquiries for ABB SPAU 121 C replacement relays, legacy SPACOM spares and SPAU 121 C to REX615 retrofit requirements from India.

Description

ARP IMPEX supplies and exports ABB SPAU 121 C overvoltage and undervoltage relays for existing switchgear, substations, industrial plants and maintenance requirements.

SPAU 121 C is an older ABB SPACOM voltage protection relay used for overvoltage and undervoltage protection and supervision in electrical distribution systems. It normally measures the phase-to-phase voltage and provides separate protection when the voltage rises above or falls below the selected limits.

Both the overvoltage and undervoltage stages can operate with definite-time or inverse-time characteristics. The undervoltage function can also be blocked through an external control signal.

Because SPAU 121 C is now a legacy relay, buyers generally search for it when they need:

• Replacement of a failed relay
• Matching spare for existing switchgear
• Plant shutdown spare
• Maintenance stock
• Legacy ABB SPACOM relay availability
• Upgrade from SPAU 121 C to REX615

If you are looking for an ABB SPAU 121 C supplier in India, SPAU 121 C price, discontinued SPAU relay availability or SPAU 121 C replacement, send the complete part code or relay nameplate for checking.

Request a Quote for ABB SPAU 121 C

For pricing and availability, please share:

• Complete ABB SPAU 121 C part number or order code
• Clear relay nameplate photograph
• Required quantity
• Destination country
• Required delivery schedule

If the full order code is unavailable, please mention:

• 100 V or 110 V input
• Auxiliary supply voltage
• 50 Hz or 60 Hz version
• Original SPAU 121 C or REX615 retrofit requirement

For an old relay replacement, the existing nameplate is normally the best starting point.

Why Buy ABB SPAU 121 C from ARP IMPEX?

• Support for legacy ABB SPACOM relay requirements
• Part-code and nameplate checking
• Matching spare and replacement enquiries
• Quotations for single units and multiple quantities
• Support for discontinued ABB relay requirements
• Assistance with SPAU 121 C to REX615 retrofit enquiries
• Technical datasheets with quotation
• Export packing and international shipping assistance
• Supply support for utilities, EPC contractors and industrial maintenance buyers

ABB SPAU 121 C Model and Product Status

SPAU 121 C is a specific ABB relay model, not a product family with several separate model numbers.

It belongs to ABB’s older SPACOM / SPAU voltage protection range and uses the SPCU 1C1 overvoltage and undervoltage relay module.

• Model: SPAU 121 C
• Series: SPACOM / SPAU
• Relay type: Combined overvoltage and undervoltage relay
• Product status: Not active since 2009
• Main use: Voltage protection and supervision in distribution substations

Technical Specifications

• Brand: ABB
• Series: SPACOM / SPAU
• Model: SPAU 121 C
• Product type: Overvoltage and undervoltage protection relay
• Product status: Legacy / not active since 2009
• Overvoltage protection: U>
• Undervoltage protection: U<
• ANSI functions: 59 overvoltage and 27 undervoltage
• Voltage measurement: Normally phase-to-phase voltage
• Rated voltage inputs: 100 V or 110 V
• Rated frequency: 50 Hz or 60 Hz
• Overvoltage operating characteristic: Definite time or inverse time
• Undervoltage operating characteristic: Definite time or inverse time
• Undervoltage blocking: External blocking input available
• Automatic undervoltage blocking: Available on loss of energising voltage
• Trip outputs: Two trip output relays
• Signalling: Separate alarm/start outputs
• Communication: SPA serial interface
• Fibre-optic communication: Supported through applicable SPA-ZC bus connection module
• Wide auxiliary supply: 80–265 V AC/DC
• Low-voltage auxiliary supply: 18–80 V DC
• Measured values: Available on the relay display
• Recorded fault information: Available
• Self-supervision: Continuous hardware and software supervision
• Relay module: SPCU 1C1

The exact rated voltage and auxiliary supply should be checked from the existing ABB order code or relay nameplate.

Features

• Combined overvoltage and undervoltage protection
• Separate overvoltage stage
• Separate undervoltage stage
• Definite-time operation
• Inverse-time operation
• External undervoltage blocking
• Automatic blocking of undervoltage protection if measuring voltage is lost
• Separate trip and signalling outputs
• Voltage measurement
• Recorded fault values
• Digital front display
• SPA serial communication
• Fibre-optic substation bus connection through applicable module
• Continuous relay self-supervision
• 100 V and 110 V input options
• 50 Hz and 60 Hz versions
• Different auxiliary supply versions

The relay is mainly a voltage supervision device, so there is no need to treat the page like a multifunction protection-relay handbook.

Applications

ABB SPAU 121 C is commonly found in:

• Distribution substation voltage protection
• Overvoltage protection
• Undervoltage protection
• Busbar voltage supervision
• Medium-voltage switchgear
• Incoming feeder voltage supervision
• Industrial substations
• Power distribution panels
• Existing ABB SPACOM protection panels
• Legacy switchgear maintenance
• Plant shutdown spare requirements
• Existing SPAU 121 C replacement
• Protection-panel modernization
• SPAU 121 C to REX615 retrofit

ABB specifically identifies SPAU 121 C for overvoltage and undervoltage protection and supervision in distribution substations.

ABB SPAU 121 C Replacement

Replacement is now one of the main commercial requirements for SPAU 121 C because the relay has been inactive since 2009.

Buyers may require:

• Original SPAU 121 C spare
• Matching legacy relay
• Replacement for a failed unit
• Maintenance stock
• Emergency shutdown spare
• Modern replacement for old switchgear

For an ABB SPAU 121 C replacement relay, send:

• Complete ABB order code
• Clear nameplate photograph
• Required quantity
• Destination country

For an exact legacy replacement, also check:

• 100 V or 110 V input
• 50 Hz or 60 Hz
• Auxiliary supply
• Trip and alarm arrangement

ABB SPAU 121 C Replacement with REX615

ABB’s official retrofit program supports replacing SPAU 121 C with REX615. The program includes the REX615 relay with a retrofit connector kit and is intended to reduce rewiring and shutdown work when modernising existing SPACOM installations.

A REX615 retrofit can be considered when:

• SPAU 121 C is no longer available
• An existing relay has failed
• Long-term support is required
• Old switchgear is being modernised
• The protection system is being upgraded
• IEC 61850 communication or additional functions are required

ABB states that the REX615 configuration must be prepared for the actual application before commissioning. The newer relay can also provide additional protection, control and monitoring functions beyond those available in the original SPACOM relay.

For a SPAU 121 C to REX615 replacement, the following should be checked:

• Existing voltage input
• Auxiliary supply
• Trip contacts
• Alarm contacts
• Undervoltage blocking signal
• Existing protection settings
• Panel wiring
• Communication requirement

For commercial enquiries, the existing SPAU 121 C nameplate and protection settings are normally enough to start reviewing the retrofit requirement.

Contact us for ABB SPAU 121 C price, SPAU 121 C replacement relay, discontinued ABB SPAU relay availability, ABB SPAU 121 C supplier in India, legacy SPACOM spare or SPAU 121 C to REX615 retrofit quotation from India.