Siemens 3RA2934-2B Mechanical Interlock for SIRIUS 3RT203, 3RT204 Contactors, Size S2 Original Brand New

Overview

The Siemens 3RA2934-2B mechanical interlock is an essential safety and operational component designed for building reliable reversing contactor assemblies. As a genuine accessory in the SIRIUS modular system, it ensures that two power contactors cannot be simultaneously closed, providing critical electrical interlocking for motor control applications, primarily in reversing starters. This interlock is specifically engineered for a secure and easy fit with Siemens contactors of size S2, including the popular 3RT203, 3RT204, and 3RT244 series. Its robust design guarantees dependable, long-term operation, enhancing the safety and lifespan of your industrial control systems.

Key Benefit

• Enhanced Safety: Prevents the dangerous simultaneous engagement (short circuit) of two contactors in reversing circuits.
• System Integrity: Ensures reliable sequencing and operation in demanding motor control applications.
• Genuine Compatibility: Designed specifically for seamless integration with Siemens SIRIUS 3RT2 contactors (Sizes S2/S3).
• Simple Installation: The interlock is mounted laterally between the two contactors, providing a quick, robust, and maintenance-free mechanical lock.

Technical Function & Application

The 3RA2934-2B is a passive mechanical locking device. It is installed by connecting two compatible contactors, typically used to form a reversing contactor assembly (also known as a reversing starter).

Function: When one contactor coil is energized (closed), this device physically blocks the armature of the second contactor, making it mechanically impossible for it to close, even if its coil is accidentally energized. This acts as a backup safety layer to the electrical interlocks.

• Suitable for: Reversing starter combinations, high-safety motor control circuits.
• Compatible Contactors (Size S2/S3): Siemens 3RT203, 3RT204, and 3RT244 Power Contactors.
• Mounting Position: Lateral mounting between two contactors.

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