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A Siemens contactor relay is an electromechanical switching device used primarily in industrial control systems to control electric motors, lighting, heating, and other electrical loads. Siemens offers a wide range of contactors and auxiliary relays, mainly under the SIRIUS product line.

🔌 Types of Siemens Contactor Relays: 1. Power Contactors (e.g., SIRIUS 3RT2 series)

• Designed for switching motors and high-power loads.
• Current ratings typically range from a few amps to hundreds of amps.
• Coil voltage options: 24V DC, 110V AC, 230V AC, etc.
• AC-3, AC-1 utilization categories for motor and resistive loads.

2. Auxiliary Relays / Control Relays (e.g., SIRIUS 3RH2 series)

• Used for signal switching, interlocking, and logical control.
• Lower current rating (usually up to 10A).
• Often used in conjunction with power contactors.

3. Reversing and Star-Delta Contactors

• Pre-wired contactor assemblies for motor reversing or soft-start applications.

⚙️ Key Features:

• Compact modular design.
• Snap-on auxiliary contact blocks and overload relays.
• High electrical and mechanical durability.
• Wide range of accessories (timer blocks, surge suppressors, etc.).
• UL, IEC, and CE certified.

📦 Common Part Numbers:

• 3RT2025 – Standard 3-pole contactor for small motors.
• 3RH2122 – Control relay with 4 NO/NC contacts.
• 3RT2035 – Higher current motor contactor.