The Siemens 3RA2921-1BA00 is a SIRIUS link module for screw-terminal connections, designed to provide an electrical and mechanical connection between compatible 3RV2 motor starter protectors/circuit breakers and 3RT2 contactors, 3RW3 soft starters or 3RF34 solid-state contactors. Siemens specifies it for S00/S0 circuit-breaker sizes and S0 contactor size, with a three-pole construction and screw fixing. The exact article is currently listed by Siemens as an active product.
The 3RA2921-1BA00 is part of the Siemens SIRIUS 3RA29 mounting and connection accessory range. Its primary purpose is to provide a standardized link between compatible switching and protection devices in industrial motor-control assemblies.
Siemens describes the exact product as a link module for screw terminals, suitable for:
3RV2.1 / 3RV2.2 motor starter protectors
3RT2.2 contactors
3RW3 soft starters
3RF34 solid-state contactors
This makes the accessory useful when assembling compatible SIRIUS load-feeder and motor-starter configurations.
The 3RA2921-1BA00 provides both electrical and mechanical linking between the specified compatible devices.
Instead of creating separate wiring connections between the motor starter protector and the downstream switching device, the link module provides a dedicated Siemens accessory for the compatible configuration.
This can help with:
Standardized assembly
Faster panel construction
Reduced wiring complexity
Consistent component alignment
Easier replacement and maintenance
The exact 3RA2921-1BA00 is designed for screw-terminal connections. Siemens identifies the product as a screw-terminal link module, distinguishing it from versions intended for other terminal configurations.
This makes it suitable where the associated motor starter protector and switching device use the corresponding screw-terminal arrangement.
Siemens specifies the link module for compatible 3RV2.1 and 3RV2.2 motor starter protectors/circuit breakers.
The official technical data identifies the compatible circuit-breaker sizes as S00 and S0.
Before ordering, the exact 3RV2 article should be checked against Siemens' compatibility information to ensure that the required mechanical and electrical connection is supported.
The 3RA2921-1BA00 is also specified for compatible 3RT2.2 contactors, with the contactor size identified as S0.
This allows the module to be used when connecting a suitable motor starter protector to a compatible SIRIUS contactor in a compact motor-starter or load-feeder arrangement.
The Siemens product description also identifies 3RW3 soft starters as compatible applications for the link module.
This allows a compatible motor starter protector to be connected to a suitable soft-starter arrangement using the dedicated SIRIUS accessory.
The 3RA2921-1BA00 is additionally specified for 3RF34 solid-state contactors.
Siemens' 2025 SIRIUS documentation specifically lists the 3RA2921-1BA00 as a link module between a motor starter protector and a solid-state contactor with screw terminals.
This makes the module useful in motor-control assemblies using semiconductor switching technology.
The exact product is specified as a three-pole link module.
The three-pole design is suitable for compatible three-phase motor-control and load-feeder arrangements.
Siemens specifies the circuit-breaker side for S00 and S0 sizes and the contactor side as S0.
This makes the 3RA2921-1BA00 particularly relevant for compact SIRIUS load-feeder configurations involving S00/S0 motor starter protectors and S0 switching devices.
Siemens' 2025 catalog also lists the article for S00/S0 → S00/S0 link-module applications.
Siemens' 2025 IC10 catalog notes that these link modules can be used up to:
16 A for Size S00
32 A for Size S0
65 A for Size S2
For the 3RA2921-1BA00, the relevant application is the S00/S0 range, so the connected devices and actual current should be checked against the Siemens selection data before installation.
The 3RA2921-1BA00 uses screw fixing as its specified fastening method.
This provides a conventional mechanical fastening arrangement for industrial electrical assemblies.
Siemens specifies a net weight of approximately 0.055 kg for the exact article. The Industry Mall lists packaging dimensions of approximately 63 × 106 × 50 mm and a packaging quantity of 1 piece.
Its compact construction makes it suitable for space-conscious industrial electrical assemblies.
The 3RA2921-1BA00 is supplied in single-unit packaging. Siemens lists a packaging quantity of 1 piece for this article.
This is useful for:
Replacement requirements
Maintenance orders
Panel-building procurement
Individual component sourcing
Spare-parts requirements
Siemens currently lists 3RA2921-1BA00 as PLM PM300: Active Product. The Siemens Industry Mall product page also identifies it as a standard product that can be ordered individually.
The Siemens datasheet currently available for this article is dated February 3, 2026.
The link module can be used to connect compatible 3RV2 motor starter protectors with appropriate S0 switching devices.
It is suitable for standardized SIRIUS load-feeder configurations in control cabinets.
The module can be used with compatible 3RW3 soft starters.
It can be used with compatible 3RF34 solid-state contactors.
The standardized link arrangement is useful for panel builders assembling Siemens motor-control equipment.
The single-unit packaging makes the article convenient for component replacement and maintenance procurement.
The 3RA2921-1BA00 is suitable for OEM equipment manufacturers, electrical panel builders, industrial maintenance teams, industrial buyers and electrical product dealers.
For SB Smart, this product is best positioned around industrial electrical product supply, dealer/distributor procurement and replacement sourcing, without claiming automation integration or automation-service work.
The product is relevant for customers looking to buy Siemens SIRIUS link modules and compatible motor-control accessories for industrial electrical assemblies.
Siemens SIRIUS link module
Article number 3RA2921-1BA00
Screw-terminal design
Electrical and mechanical connection
Compatible with 3RV2.1 / 3RV2.2
Compatible with 3RT2.2
Compatible with 3RW3 soft starters
Compatible with 3RF34 solid-state contactors
Circuit-breaker side: S00 / S0
Contactor side: S0
Three-pole construction
Screw fixing
Single-unit packaging
Net weight approximately 0.055 kg
Active Siemens product
Electrical and mechanical linking: Provides a dedicated connection between compatible SIRIUS devices.
Multiple application options: Supports 3RT2 contactors, 3RW3 soft starters and 3RF34 solid-state contactors.
S00/S0 compatibility: Suitable for compact motor-control assemblies.
Screw-terminal design: Matches compatible screw-terminal equipment.
Three-pole configuration: Suitable for three-phase applications.
Standardized Siemens accessory: Helps simplify component assembly.
Single-piece packaging: Convenient for replacement and individual procurement.
Compact design: Helps maintain an organized electrical-panel layout.
The Siemens 3RA2921-1BA00 is a dedicated SIRIUS link module for screw-terminal connections, providing electrical and mechanical linking between compatible 3RV2 motor starter protectors and 3RT2 contactors, 3RW3 soft starters or 3RF34 solid-state contactors.
Its three-pole S00/S0 design, screw fixing and single-unit packaging make it suitable for customers purchasing Siemens accessories for load feeders, motor starters, panel assemblies and replacement requirements.
For SB Smart, this product should be presented as a Siemens industrial electrical accessory for supply and procurement, suitable for industrial buyers, panel builders, maintenance teams and electrical dealers.
SB Smart supplies Siemens industrial electrical products and accessories across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and other major Indian cities.
Major delivery locations include:
Faridabad
Delhi
Gurgaon/Gurugram
Delhi NCR
Noida
Greater Noida
Haryana
Punjab
Mumbai
Pune
Ahmedabad
Bengaluru
Hyderabad
Chennai
Kolkata
Jaipur
Chandigarh
Lucknow
Indore
Surat
Vadodara
Nagpur
Coimbatore
And other major cities across India
It is a Siemens SIRIUS link module for screw-terminal connections, used for electrical and mechanical linking of compatible 3RV2 motor starter protectors with 3RT2 contactors, 3RW3 soft starters or 3RF34 solid-state contactors.
Siemens specifies 3RV2.1 and 3RV2.2 motor starter protectors/circuit breakers for the exact link module.
Yes. Siemens specifies compatibility with 3RT2.2 contactors of Size S0.
Yes. The Siemens product description specifies compatibility with 3RW3 soft starters.
Yes. Siemens specifies compatibility with 3RF34 solid-state contactors.
The 3RA2921-1BA00 is the screw-terminal version.
It is a three-pole link module.
Siemens specifies S00/S0 on the circuit-breaker side and S0 on the contactor side.
Yes. Siemens lists single-unit packaging with a quantity of 1 piece.
SB Smart supplies Siemens industrial electrical products and accessories in India, including SIRIUS link modules, load-feeder accessories and related motor-control components for industrial procurement and replacement requirements.
| Specification | Details |
|---|---|
| Product Name | Link Module |
| Manufacturer | Siemens |
| Series | SIRIUS 3RA |
| Order Code | 3RA2921-1BA00 |
| Product Type | Link Module |
| Packaging Type | Single Unit |
| Function | Electrical & Mechanical Connection |
| Connection Type | Screw Terminal |
| Compatible Series | 3RA Load Feeders |
| Compatible Devices | 3RV2 Motor Starter Protectors, 3RT2 Contactors |
| Suitable Frame Size | S0 |
| Application | Load Feeder Assembly |
| Pole Configuration | 3 Pole |
| Installation Type | Direct Device Coupling |
| Industrial Application | Yes |
| Maintenance Requirement | Low |
| Brand | Siemens |
| Condition | New & Genuine Product |
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