Siemens 3RH1921-1DA11 Auxiliary Switch, 6A, 2-Pole

Siemens 3RH1921-1DA11 Auxiliary Switch is a compact, dependable signaling device engineered for industrial electrical service, maintenance, and replacement projects. With a 2 poles and a 6 A switching rating, this auxiliary switch provides reliable feedback for control circuits without overloading your system.

• Part Number: 3RH1921-1DA11
• Type: Auxiliary Switch
• Poles: 2
• Current Rating: 6 A
• Application: Ideal for industrial control panels, motor control centers, and automation cabinets; designed to deliver signaling and feedback to PLCs and control logic

Why this Siemens auxiliary switch stands out is its targeted utility in real-world scenes: it serves as the essential signaling companion to contactors and controllers, helping your automation system verify the status of equipment, trigger interlocks, and provide clean, reliable feedback signals for safety and efficiency.

Practical use cases include:

• Providing auxiliary contacts in control panels to feed PLC inputs and HMI indicators
• Supplying signaling for motor starting sequences and stop conditions
• Supporting machine guarding interlocks and safety circuits where clear status feedback is critical
• Serving as a trusted replacement part in existing Siemens installations to maintain compatibility

Compatibility and fit are confirmed by the part number and your specific application requirements. Notes: Verify fit by part number and application requirements. Need help matching a part number or confirming compatibility? Message us and we'll help.