Product Description

Siemens 3RA2933-2AA1 Reversing Contactor Assembly Kit for 3RT2 – S2-S2

The Siemens 3RA2933-2AA1 is a wiring and assembly kit for SIRIUS 3RT2 contactors, designed for creating reversing contactor assemblies in Size S2-S2. The kit is intended for screw-terminal contactors and includes the required connecting components and top/bottom wiring modules for the reversing starter arrangement. Siemens specifies that the 3RA2934-2B mechanical interlock must be ordered separately.

This distinction is important: 3RA2933-2AA1 is the assembly/wiring kit, while 3RA2934-2B is the mechanical interlock accessory for the compatible reversing contactor arrangement.

Siemens SIRIUS 3RA2933-2AA1 Assembly Kit

The 3RA2933-2AA1 is part of the Siemens SIRIUS accessories used for building reversing contactor assemblies from individual 3RT2 contactors.

Siemens identifies this article as a wiring kit with screw terminals for a reversing starter, Size S2, with top and bottom wiring modules and a three-pole configuration.

The assembly kit can help simplify the physical construction of a reversing starter by providing standardized connection components for the contactor pair.

Designed for S2-S2 Contactors

The exact 3RA2933-2AA1 is designed for S2 contactor assemblies, particularly applications using two compatible 3RT203 contactors. Siemens' 2025 catalog lists the kit under 3RT203 S2-S2 reversing contactor assemblies.

This makes it suitable for applications where two S2 contactors are arranged for forward/reverse motor control.

What Is Included?

According to Siemens, the 3RA2933-2AA1 assembly kit includes:

• Two connectors for two contactors

• Top wiring module

• Bottom wiring module

• Wiring arrangement for the main and auxiliary circuits

The kit is intended for screw-terminal contactors.

The mechanical interlock 3RA2934-2B is not included and must be ordered separately when mechanical interlocking is required.

Mechanical Interlock Compatibility

For a complete reversing starter, the 3RA2933-2AA1 can be combined with the Siemens 3RA2934-2B mechanical interlock.

The mechanical interlock physically prevents the two contactors from being switched on simultaneously. Siemens identifies 3RA2934-2B as the separate mechanical interlocking accessory for the applicable reversing contactor arrangements.

This means the assembly kit and mechanical interlock serve different functions:

3RA2933-2AA1: Wiring, connectors and assembly arrangement
3RA2934-2B: Mechanical interlocking between contactors

Electrical and Mechanical Assembly

A reversing contactor starter normally uses two contactors, with one controlling the forward direction and the other controlling the reverse direction.

The 3RA2933-2AA1 helps provide the required physical connection and wiring arrangement between the contactors.

The separate 3RA2934-2B mechanical interlock adds a physical blocking mechanism to the assembly. Proper electrical interlocking using auxiliary contacts should also be implemented as required by the control design.

Screw-Terminal Version

The exact 3RA2933-2AA1 is the screw-terminal version of the S2-S2 reversing assembly kit. Siemens' datasheet explicitly identifies the product as a “Wiring kit for screw terminal” for an electrical and mechanical reversing starter S2 configuration.

This makes it suitable for Siemens SIRIUS contactor assemblies using the corresponding screw-terminal configuration.

Three-Pole Configuration

Siemens specifies the 3RA2933-2AA1 as a three-pole wiring kit.

This makes it suitable for three-phase motor reversing applications using compatible SIRIUS contactors.

Compact Industrial Assembly

The product has a net weight of approximately 0.159 kg.

Its standardized design allows panel builders and electrical equipment manufacturers to create compatible reversing contactor arrangements without individually fabricating the interconnection hardware.

Typical Applications

Forward/Reverse Motor Starters

The assembly kit is suitable for three-phase motors requiring forward and reverse operation.

Machine Tools

It can be used in motor-control assemblies for machinery where directional motor operation is required.

Conveyors

Suitable for conveyor systems where motor direction may need to be reversed.

Material Handling Equipment

The kit can be used in reversing contactor assemblies for industrial material-handling equipment.

Production Machinery

It is suitable for industrial electrical panels using compatible Siemens SIRIUS contactors.

Industrial Motor Control Panels

Panel builders can use the kit when assembling S2-S2 reversing contactor arrangements.

Suitable for OEMs, Panel Builders and Electrical Dealers

The 3RA2933-2AA1 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 Siemens industrial electrical product supply, dealer/distributor procurement and replacement sourcing, without claiming automation integration or automation-service work.

SB Smart can supply Siemens SIRIUS contactor accessories and assembly components for customers across Faridabad, Delhi NCR, Gurgaon/Gurugram, Noida, Haryana, Punjab, Mumbai and other major Indian cities.

Key Features

• Siemens SIRIUS reversing contactor assembly kit

• Article number 3RA2933-2AA1

• Wiring kit for screw-terminal contactors

• Designed for S2-S2 reversing starter arrangements

• Suitable for compatible 3RT203 contactors

• Two connectors for two contactors

• Top wiring module

• Bottom wiring module

• Three-pole configuration

• Electrical and mechanical assembly components

• Mechanical interlock 3RA2934-2B ordered separately

• Siemens SIRIUS accessory for 3RT2 contactors

Benefits

• Simplified reversing-starter assembly: Provides standardized connection components.

• S2-S2 compatibility: Designed for compatible Siemens S2 contactor arrangements.

• Screw-terminal design: Suitable for screw-terminal 3RT2 contactors.

• Top and bottom wiring modules: Helps organize the contactor interconnection.

• Two-contactors arrangement: Supports forward/reverse motor-control assemblies.

• Separate mechanical interlock option: Can be paired with 3RA2934-2B where physical interlocking is required.

• Factory-designed accessory: Provides a Siemens-compatible assembly solution.

• Useful for replacement and procurement: Suitable for panel-building and maintenance requirements.

Why Choose Siemens 3RA2933-2AA1?

The Siemens 3RA2933-2AA1 is a dedicated S2-S2 reversing contactor assembly and wiring kit for compatible 3RT2 contactors. Siemens specifies the kit for screw-terminal contactors and confirms that it contains the top and bottom wiring modules and two contactor connectors.

For a complete reversing starter, the 3RA2934-2B mechanical interlock is ordered separately. This is an important procurement detail when purchasing the assembly components.

For SB Smart, the product is relevant for customers looking to buy Siemens contactor accessories, reversing-starter assembly kits and industrial electrical components for panel building, maintenance and replacement applications.

Delivery Across India

SB Smart supplies Siemens industrial electrical products and accessories across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and other major cities across India.

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

Frequently Asked Questions

1. What is Siemens 3RA2933-2AA1?

It is a Siemens SIRIUS wiring and assembly kit for reversing contactor arrangements, designed for S2-S2 screw-terminal contactors.

2. Which contactors is it designed for?

Siemens lists the kit for compatible S2 3RT203 contactor assemblies.

3. Is the mechanical interlock included?

No. The 3RA2934-2B mechanical interlock must be ordered separately.

4. What does the assembly kit contain?

It contains two connectors for two contactors and top/bottom wiring modules for the reversing assembly.

5. Is it suitable for screw-terminal contactors?

Yes. The exact product is the screw-terminal version.

6. What contactor size is supported?

The product is designed for S2-S2 contactor arrangements.

7. How many poles does the kit support?

Siemens specifies a three-pole configuration.

8. What is the purpose of the kit?

It provides the wiring and connecting components needed to assemble two compatible contactors into a reversing-starter arrangement.

9. Is it useful for panel builders?

Yes. It is intended for standardized Siemens SIRIUS reversing-starter assemblies and can simplify procurement and assembly of compatible contactor arrangements.

10. Where can I buy Siemens 3RA2933-2AA1 in India?

SB Smart supplies Siemens industrial electrical products and accessories in India, including SIRIUS contactor accessories, reversing-starter assembly kits and related components for industrial procurement and replacement requirements.