🔹 Mechanical Interlock – Siemens 3TX40911A (3TX Series)
The Siemens 3TX40911A is a mechanical interlock from the 3TX series, designed to be used between two contactors to ensure safe operation in interlocking applications. It prevents both contactors from being switched ON at the same time, providing electrical and mechanical safety in motor control circuits.
It is commonly used in forward-reverse motor starters, changeover systems, and automation panels, where two contactors must operate in a mutually exclusive manner to avoid short circuits or equipment damage.
This interlock is mounted directly on compatible Siemens contactors and ensures reliable mechanical linkage between them for safe switching logic.
🔹 Key Features
• Siemens 3TX Series mechanical interlock
• Model: 3TX40911A
• Designed for use with Siemens 3TF / 3TS contactors (vashiisl.com)
• Prevents simultaneous energizing of two contactors
• Used in forward-reverse and changeover motor circuits
• Mechanical safety locking system
• Compact modular design for easy installation
• High reliability in industrial control panels
• Ensures electrical interlocking safety
• Suitable for MCC and automation systems
• Long mechanical life and low maintenance
• Compatible with Siemens industrial contactor range
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3TX Series |
| Model Number | 3TX40911A |
| Product Type | Mechanical Interlock |
| Application | Contactor interlocking (Forward/Reverse, Changeover) |
| Compatibility | Siemens 3TF / 3TS contactors (vashiisl.com) |
| Mounting Type | Front / side mounted (contactor mounted) |
| Function | Prevents simultaneous ON state |
| Usage | Motor control, reversing starters, industrial automation |
| Brand | Siemens |
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