3RH2911-1LA20
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The Siemens 3RH2911-1LA20 is an industrial-grade auxiliary switch block designed for seamless integration with Siemens contactors in automation systems. This snap-on front mount auxiliary switch features 2 normally open (2NO) contacts, providing reliable switching capabilities for control circuits. Engineered for robustness, it supports a wide range of applications due to its high mechanical endurance and conformity to IEC standards. With screw terminal connections and a compact design compatible with S00 to S3 size contactors, the 3RH2911-1LA20 offers easy installation and dependable operation in demanding industrial environments. Its IP20 degree of protection on the front ensures safety against accidental contact while maintaining accessibility for maintenance. This auxiliary contact block is an essential component for enhancing machine automation and factory control panels, delivering precise status indication and auxiliary switching functions.
Key Features of Siemens 3RH2911-1LA20
- Snap-on front mounting for quick and secure installation on Siemens contactors
- 2 normally open (2NO) auxiliary contacts for control signaling
- Screw terminal connections with cable entry from the top — supports cables up to 2 x 2.5 mm²
- Compatible with size S00, S0, S2, and S3 contactors and contactor relays
- Rated insulation voltage of 690 V with degree of pollution 3
- Surge voltage resistance rated at 6 kV for industrial robustness
- Mechanical service life of approximately 10 million operating cycles
- Electrical endurance at AC-15, 230 V, typically 200,000 cycles
- IP20 protection rating on the front for safe operation in control panels
- Meets IEC 60947-5-1 international standard
Technical Specs of 3RH2911-1LA20
Explore Siemens 3RH2911-1LA20 technical data covering voltage, contact configuration, and mechanical endurance to ensure system compatibility.
| Parameter | Value |
|---|---|
| Auxiliary Contacts | 2 Normally Open (2NO) |
| Rated Insulation Voltage | 690 V AC |
| Surge Voltage Resistance | 6 kV |
| Mechanical Service Life | ~10,000,000 cycles |
| Electrical Endurance (AC-15, 230 V) | ~200,000 cycles |
| Degree of Protection (front) | IP20 |
| Mounting Type | Snap-on Front Mount |
| Terminal Type | Screw |
Applications / Use Case
This Siemens 3RH2911-1LA20 is commonly used in industrial automation setups worldwide. It provides auxiliary switching functions that support status monitoring and interlocking in machine automation, production line systems, and factory control panels. Its reliability in demanding electrical environments makes it suitable for process control tasks and conveyor operations where precise auxiliary signals are critical to system performance. The compact and modular design also allows for easy integration into existing contactor setups, enhancing flexibility and maintainability in automated production equipment.
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