ABB SPAA 121 C Feeder Protection Relay

ABB SPAA 121 C Feeder Protection Relay Supplier and Exporter in India

ABB SPAA 121 C Relay Replacement with REX615

Replacement: ABB SPAA 121 C is discontinued and is supported under ABB’s SPACOM-to-REX615 retrofit program. The installed relay version and panel details should be checked before proceeding with the retrofit.

ARP IMPEX supplies and exports ABB SPAA 121 C feeder protection relays for replacement, maintenance spares and existing medium-voltage switchgear installations.

SPAA 121 C belongs to ABB’s older SPACOM relay range. It was developed for short-circuit and earth-fault protection of radial distribution feeders and combines two-phase overcurrent protection, directional earth-fault protection and circuit-breaker failure protection in one relay.

One of the important differences with SPAA 121 C is its 0.2 A and 1 A earth-fault current inputs. This made it suitable for feeder applications where more sensitive earth-fault detection was required. ABB confirms that SPAA 120 C and SPAA 121 C have the same main protection functions; the earth-fault input rating is the main difference between them.

The relay is still found in older distribution substations, industrial switchboards and utility feeder panels. Since ABB stopped active supply of SPAA 121 C in 2009, most current enquiries are for a failed relay replacement, shutdown spare, maintenance stock or retrofit of an existing SPACOM panel.

If you are looking for ABB SPAA 121 C price, availability or replacement from India, send us the complete ABB order code and a clear nameplate photograph. This helps us identify the correct version before quotation.

Technical Specifications

• Brand: ABB
• Series: SPACOM / SPAA
• Model: SPAA 121 C
• Product type: Feeder protection relay
• Product status: Discontinued / legacy
• Main use: Radial distribution feeder protection
• Phase overcurrent measurement: Two-phase
• Phase current inputs: 1 A / 5 A
• Earth-fault current inputs: 0.2 A / 1 A
• Residual voltage input: 100 V / 110 V
• Rated frequency: 50 Hz or 60 Hz, depending on order code
• Overcurrent protection: Low-set and high-set stages
• Earth-fault protection: Sensitive directional low-set stage
• High-set earth fault: Directional or non-directional operation
• Circuit-breaker failure protection: Included
• Communication: Serial interface / fibre-optic SPA bus
• Auxiliary supply: 80–265 V AC/DC or 18–80 V DC, depending on version
• Self-supervision: Built-in
• Enclosure protection: IP54

For an exact replacement, it is better to check the complete ABB order number instead of selecting a relay only from the SPAA 121 C model designation.

Features

• Sensitive directional earth-fault protection
• 0.2 A and 1 A earth-fault current inputs
• Two-phase overcurrent protection
• Low-set overcurrent stage
• High-set short-circuit stage
• Directional low-set earth-fault stage
• Directional or non-directional high-set earth-fault stage
• Integrated circuit-breaker failure protection
• Definite-time and inverse-time overcurrent operation
• Numerical display for settings and measured values
• Fault information and recorded values
• SPA serial communication
• Internal hardware and software supervision

For buyers replacing an existing relay, the most useful information at the enquiry stage is normally the part code, nameplate, quantity and destination. Detailed protection settings can be checked later if needed.

Applications

SPAA 121 C is mainly used for:

• Radial distribution feeder protection
• Medium-voltage feeder protection
• Sensitive earth-fault protection
• Directional earth-fault protection
• Feeder short-circuit protection
• Isolated-neutral distribution networks
• Resistance-earthed networks
• Impedance-earthed networks
• Resonant-earthed networks
• Distribution substations
• Industrial switchgear
• Utility feeder panels
• Existing ABB SPACOM protection panels
• Plant shutdown and maintenance spares

ABB designed SPAA 121 C for selective short-circuit and earth-fault protection of radial distribution networks. Its directional earth-fault element can be applied in different neutral-earthing arrangements.

Difference Between ABB SPAA 120 C and SPAA 121 C

SPAA 120 C and SPAA 121 C are closely related feeder protection relays and perform the same main protection functions.

The key difference is the rated earth-fault current input:

• SPAA 120 C: 1 A and 5 A earth-fault inputs
• SPAA 121 C: 0.2 A and 1 A earth-fault inputs

ABB specifically recommends SPAA 121 C where the more sensitive earth-fault input is required.

Because of this difference, an existing SPAA 121 C should not automatically be replaced with SPAA 120 C without checking the CT arrangement and original relay details.

ABB SPAA 121 C Replacement

ABB lists SPAA 121 C as not active since 2009. Current requirements generally come from buyers looking for:

• Replacement of a failed SPAA 121 C
• Matching legacy SPACOM spare
• Emergency feeder relay replacement
• Plant shutdown spare
• Maintenance stock
• Spare for older switchgear
• Upgrade of an existing SPACOM protection panel

For an exact legacy replacement, send:

• Complete ABB order code
• Clear relay nameplate photograph
• Quantity
• Destination country
• Required delivery date

ABB SPAA 121 C to REX615 Retrofit

ABB officially includes SPAA 121 C in its current SPACOM-to-REX615 Relay Retrofit Program.

The ABB retrofit package includes the REX615 relay, retrofit connector kit and documentation. ABB developed the program to simplify replacement of supported SPACOM relays and reduce the amount of rewiring and shutdown work compared with a completely new protection-panel installation.

A retrofit may be considered when:

• The existing SPAA 121 C has failed
• Legacy spare availability is becoming difficult
• Several old SPACOM relays are being phased out
• The feeder panel is being modernised
• Long-term relay support is required

For an initial SPAA 121 C to REX615 retrofit enquiry, send the existing relay nameplate and quantity. Panel and protection details can then be checked as required.

Why Buy ABB SPAA 121 C from ARP IMPEX?

ARP IMPEX supports buyers looking for ABB legacy protection relays for existing installations, maintenance and shutdown requirements.

We can assist with:

• ABB SPAA 121 C part-code checking
• Nameplate matching
• Legacy relay availability
• Replacement for failed SPAA 121 C relays
• REX615 retrofit enquiries
• Single and multiple quantity requirements
• Maintenance and shutdown spares
• ABB technical documentation
• Export packing
• International shipping

We handle ABB relay enquiries from utilities, power plants, EPC contractors, industrial companies, panel builders, maintenance companies and electrical traders.

Request a Quote for ABB SPAA 121 C

For ABB SPAA 121 C price and availability, please send:

• Complete ABB SPAA 121 C order code
• Clear nameplate photograph
• Quantity required
• Destination country
• Required delivery date

If the order code is not readable, send us the relay nameplate photograph, and we can start checking from there.

Send your ABB SPAA 121 C part code, quantity and destination country to ARP IMPEX for replacement availability, price and export quotation.