🔹 Auxiliary Contactor Relay – Siemens 3TH30220BB4 (3TH Series)
The Siemens 3TH30220BB4 is an auxiliary contactor relay from the 3TH series, designed for control, signaling, and interlocking functions in industrial electrical systems. It is used in control panels and automation systems to extend auxiliary contacts of main contactors and ensure reliable operation of control circuits.
This relay is ideal for PLC-based automation, MCC panels, and machine control applications where safe, efficient, and precise switching of low-power control signals is required. It offers high durability, stable performance, and long operational life in continuous industrial environments.
🔹 Key Features
• Siemens 3TH Series auxiliary contactor relay
• Model: 3TH30220BB4
• Designed for control, signaling, and interlocking applications
• Used to extend auxiliary contact capacity of contactors
• High electrical and mechanical endurance
• Compact modular design for panel mounting
• Suitable for PLC and automation systems
• Reliable low-power switching performance
• Easy installation and maintenance-free operation
• Shock and vibration resistant construction
• Long service life in continuous duty
• Compatible with industrial control circuits
• Safe and stable operation in harsh environments
• Suitable for MCC and control distribution panels
| Parameter | Specification |
|---|---|
| Product Series | Siemens 3TH Auxiliary Contactor Relay |
| Model Number | 3TH30220BB4 |
| Product Type | Auxiliary Contactor Relay |
| Function | Control / Signal Switching / Interlocking |
| Contact Configuration | 2NO + 2NC (typical BB4 variant) |
| Coil Voltage | As per BB4 variant (refer datasheet) |
| Mounting Type | Panel Mounting |
| Application | PLC systems, MCC panels, control circuits |
| Brand | Siemens |
| Duty Type | Control / Auxiliary Switching |
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