The Siemens 3RA2912-2H is a mechanical interlock and coupling accessory for Siemens SIRIUS 3RT2.1 contactors, designed for S00-S00 contactor combinations. The kit consists of two connecting clips and one anchor for one contactor combination and is intended for creating 3- or 4-pole contactor assemblies, including reversing contactor arrangements. Siemens currently lists the article as an active product.
For SB Smart, this product is positioned as a Siemens industrial electrical accessory for product supply, procurement, panel-building and replacement requirements, without claiming automation integration or automation-service work.
The 3RA2912-2H belongs to the Siemens SIRIUS range of mechanical interlock and coupling accessories for contactor assemblies.
Its main purpose is to physically connect and interlock two compatible contactors so they can be assembled as a coordinated contactor combination. Siemens describes the exact product as a lateral interlock for 3RT2.1 contactors.
This makes the accessory particularly useful in applications where two contactors need to operate in a mutually exclusive manner.
Siemens specifies the 3RA2912-2H for 3RT201 and 3RT231 contactors in Size S00 configurations. The Siemens catalog also identifies the 3RA2912-2H as the mechanical interlock assembly kit for these S00 contactor combinations.
The exact contactor article numbers should be checked before purchase to confirm mechanical compatibility.
The 3RA2912-2H is designed for S00-S00 contactor combinations.
Siemens states that the interlocking assembly kits can be used without a contactor clearance for the applicable S00 combinations.
This makes the accessory suitable for compact contactor assemblies used in industrial motor-control panels.
The primary function of the 3RA2912-2H is to provide mechanical interlocking between two compatible contactors.
In a reversing motor starter, one contactor may be used for forward operation and the other for reverse operation. The mechanical interlock helps prevent both contactors from being mechanically engaged simultaneously.
Mechanical interlocking should be considered together with suitable electrical interlocking in the complete motor-control circuit.
One important feature of the exact 3RA2912-2H is its defined component content. Siemens specifies that one assembly kit consists of a mechanical interlock and two connecting clips.
The current Siemens datasheet/product description identifies the article as a lateral interlock consisting of two connectors and one anchor for one combination.
These components provide the physical coupling and interlocking required for the compatible contactor pair.
Siemens identifies the 3RA2912-2H as a mechanical interlock assembly kit for creating 3- or 4-pole contactor assemblies.
This makes it suitable for applications where compatible SIRIUS contactors are arranged as a mechanically coupled pair.
The 3RA2912-2H is suitable for compatible reversing contactor assemblies.
A reversing starter normally uses two contactors to control the direction of a three-phase motor. The mechanical interlock provides a physical safeguard against simultaneous engagement of both contactors.
Typical applications include:
Forward/reverse motor starters
Conveyor systems
Machine tools
Material-handling equipment
Production machinery
Industrial motor-control panels
Direction-control applications
Replacement and maintenance assemblies
A properly designed reversing starter generally uses both mechanical and electrical interlocking.
Mechanical interlocking:
The 3RA2912-2H physically interlocks the compatible contactors.
Electrical interlocking:
Suitable auxiliary contacts are incorporated into the control circuit to prevent the opposite contactor coil from being energized.
Siemens' documentation shows the 3RA2912-2H as the mechanical interlock component within the corresponding contactor assembly arrangement.
The exact 3RA2912-2H is a compact accessory for S00 contactor arrangements. Siemens specifies a net weight of approximately 0.001 kg and packaging dimensions of approximately 61 × 105.5 × 46 mm.
Its compact construction is suitable for space-efficient industrial contactor assemblies.
Siemens lists the 3RA2912-2H with a quantity unit of 1 piece and packaging quantity of 1. The Industry Mall also lists a minimum order quantity of 10 pieces for the shown catalog configuration.
For procurement, the applicable ordering quantity should therefore be checked before placing an order.
Siemens currently lists 3RA2912-2H as PLM PM300: Active Product. The current Industry Mall product listing confirms the article number and active lifecycle status.
The current Siemens datasheet is dated March 8, 2026, confirming the product designation as a mechanical lateral interlock for 3RT2.1 contactors.
The accessory can be used with compatible S00 contactors for forward and reverse motor operation.
Suitable for conveyor motors that require controlled directional operation.
Useful for machine-control assemblies where motor direction must be changed.
Can be incorporated into compatible contactor assemblies for industrial handling machinery.
Suitable for machines requiring mutually interlocked contactor operation.
Panel builders can use the accessory for compatible Siemens SIRIUS S00 contactor combinations.
The 3RA2912-2H is suitable for OEM equipment manufacturers, electrical panel builders, industrial maintenance teams, industrial buyers and electrical product dealers.
For SB Smart, the product is best positioned around industrial electrical product supply, dealer/distributor procurement and replacement sourcing, without claiming automation integration or automation-service work.
Siemens SIRIUS mechanical interlock and coupling accessory
Article number 3RA2912-2H
Designed for 3RT2.1 contactors
Suitable for 3RT201 and 3RT231
S00-S00 contactor arrangement
Lateral mechanical interlock
Consists of 2 connecting clips and 1 anchor
One kit for one contactor combination
Suitable for 3- or 4-pole contactor assemblies
Suitable for reversing contactor arrangements
Can be used without contactor clearance in the specified S00 arrangements
Quantity unit: 1 piece
Active Siemens product
Mechanical interlocking: Helps prevent simultaneous mechanical engagement of two compatible contactors.
S00-S00 compatibility: Designed for compact S00 contactor combinations.
Dedicated Siemens accessory: Provides a product-specific interlocking solution.
Two clips and anchor: Provides the required coupling components for one combination.
Reversing-starter use: Suitable for forward/reverse motor-control arrangements.
Compact design: Suitable for industrial electrical panels.
Replacement friendly: Useful for maintenance and spare-part procurement.
Standardized assembly: Helps simplify compatible Siemens contactor arrangements.
The Siemens 3RA2912-2H is a dedicated mechanical interlock and coupling kit for 3RT2.1 S00 contactors, particularly the 3RT201 and 3RT231 contactor families. Siemens specifies the kit for S00-S00 combinations and states that it can be used for 3- or 4-pole contactor assemblies.
For SB Smart, this accessory is relevant for customers looking to buy Siemens contactor accessories, mechanical interlocks and industrial electrical components for panel building, maintenance and replacement requirements.
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
The 3RA2912-2H is a Siemens SIRIUS mechanical interlock and coupling accessory for compatible 3RT2.1 contactors.
Siemens specifies 3RT201 and 3RT231 contactors for the S00-S00 configuration.
The exact product is designed for S00-S00 contactor combinations.
One assembly kit consists of a mechanical interlock, two connecting clips and the specified coupling/anchor arrangement for one contactor combination.
Its main purpose is to provide mechanical connection and interlocking between two compatible S00 contactors.
Yes. It is suitable for compatible reversing contactor assemblies and other mutually interlocked contactor combinations.
No. It provides mechanical interlocking; electrical interlocking is implemented separately through the appropriate control circuit.
Yes. Siemens identifies the assembly kit for making 3- or 4-pole contactor assemblies.
Yes. Siemens currently lists 3RA2912-2H as an active product.
SB Smart supplies Siemens industrial electrical products and accessories in India, including SIRIUS mechanical interlocks, contactor accessories and motor-control components for industrial procurement and replacement requirements.
| Specification | Details |
|---|---|
| Product Name | Mechanical Interlock |
| Manufacturer | Siemens |
| Series | SIRIUS |
| Order Code | 3RA2912-2H |
| Product Type | Contactor Accessory |
| Accessory Type | Mechanical Interlock |
| Compatible Contactor Series | Siemens 3RT23 |
| Suitable For | 4 Pole Contactors |
| Function | Mechanical Interlocking |
| Application | Reversing Starter Systems |
| Installation Type | Between Contactors |
| Mounting Method | Direct Mechanical Coupling |
| Safety Function | Prevents Simultaneous Contactor Operation |
| Mechanical Durability | High |
| Maintenance Requirement | Low |
| Industrial Application | Yes |
| Brand | Siemens |
| Condition | New & Genuine Product |
No reviews yet.