🔹 Auxiliary Contact Block – Siemens 3TX40104A (3TX Series)
The Siemens 3TX40104A is an auxiliary contact block from the 3TX series, designed to be mounted on Siemens contactors for providing additional control and feedback contacts. It is used in industrial automation systems, PLC control panels, and electrical distribution circuits to extend signaling, interlocking, and status indication functions.
This module typically provides a 1NC (Normally Closed) auxiliary contact, which is used for feedback in control logic, safety interlocking, and monitoring whether the main contactor has changed state correctly.
It is a snap-on type accessory that attaches directly to compatible Siemens contactors for fast installation without wiring complexity.
🔹 Key Features
• Siemens 3TX Series auxiliary contact block
• Model: 3TX40104A
• Snap-on / plug-in mounting on contactors
• 1NC auxiliary contact configuration
• Used for control circuit feedback and interlocking
• Suitable for PLC input and status monitoring systems
• Compact modular design for easy installation
• High electrical endurance for control applications
• Reliable switching synchronized with main contactor operation
• Designed for industrial automation panels
• Supports safety and monitoring functions in control circuits
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3TX Series |
| Model Number | 3TX40104A |
| Product Type | Auxiliary Contact Block |
| Contact Type | 1NC (Normally Closed) |
| Rated Current | ~3.6 A (AC-15 control duty) |
| Mounting Type | Snap-on / Plug-in |
| Application | PLC feedback, interlocking, status indication |
| Insulation Voltage | Up to 690 V (typical Siemens auxiliary range) |
| Usage | Industrial automation & control systems |
| Brand | Siemens |
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