If you're working with motor contactors and contactor relays, you've likely encountered the need for reliable auxiliary switching capabilities. The SIEMENS 3RH6911-1HA22 auxiliary contact block is a compact yet powerful solution designed to enhance the functionality of your control systems.

Key Parameters and Technical Data

The SIEMENS 3RH6911-1HA22 is an auxiliary switch block with a configuration of 2 NO (Normally Open) + 2 NC (Normally Closed) contacts. This provides flexible switching options for various control circuit requirements.

Designed for use with S00 and S0-sized motor contactors and contactor relays, this device features screw terminal connections for secure electrical connections. Its compact dimensions make it suitable for space-conscious applications: 36 mm in width, 37.5 mm in height, and 43.7 mm in depth.

Electrical characteristics include:

• Rated operational current: 10 A

• Insulation voltage: 690 V AC (at pollution degree 3)

• Impulse withstand voltage: 6 kV

• Protection rating: IP20 (front side)

The contact block demonstrates impressive durability, with a mechanical lifespan of up to 10 million switching cycles and an electrical lifespan of approximately 200,000 operating cycles at 230 V AC-15. It maintains reliable performance across a wide temperature range, operating in environments from -25°C to +60°C and surviving storage conditions from -55°C to +80°C.

Notable Features

1. High Contact Reliability: With an exceptional error rate of only one misconnection per hundred million operations (at 17V, 1mA), this contact block ensures dependable circuit control.

2. Versatile Compatibility: Specifically designed for Siemens motor contactors and contactor relays in sizes S00 and S0, it integrates seamlessly into existing systems.

3. Durable Construction: Built to withstand millions of operations, this component offers long-term reliability in demanding industrial environments.

4. Secure Connection Method: The screw terminal design ensures reliable electrical connections, reducing the risk of loose wires or intermittent contacts.

5. Safety Compliance: The device meets relevant international standards, including IEC 60947-4-1 for mirror contacts and IEC 60947-5-1 for priority control.

Typical Applications

The SIEMENS 3RH6911-1HA22 auxiliary contact block is versatile enough for various industrial applications:

• Motor Control Circuits: Adds additional signaling or interlocking contacts to motor contactors, enabling status indication or control system interlocks.

• Industrial Automation Systems: Provides extra switching capacity in automation setups where space is limited but reliability is critical.

• Control Panel Wiring: Enhances control circuit flexibility in power distribution and control panel applications.

• Safety Interlocks: The combination of NO and NC contacts allows for creating safety circuits that require both normally open and normally closed configurations.

• Signaling and Indication: Can be used to operate indicator lamps, alarms, or other signaling devices based on the status of the main contactor.

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The SIEMENS 3RH6911-1HA22 auxiliary contact block combines German engineering with practical functionality, offering reliable performance in a compact form factor. Its blend of high switching capacity, extended lifespan, and versatile contact configuration makes it an excellent choice for enhancing motor control systems and industrial automation applications.

Whether you're designing new control systems or maintaining existing equipment, this auxiliary contact block provides the reliability and flexibility needed for demanding industrial environments. Its compatibility with S00 and S0 contactors makes it particularly valuable in space-constrained applications where every millimeter counts.