Siemens 3RH2921-2HA22-0KT0 Auxiliary Switch, 2NO+2NC, Spring-Loaded Original Brand New

Overview

The Siemens SIRIUS 3RH2921-2HA22-0KT0 is a high-performance, front-mounted auxiliary switch block designed for seamless expansion of auxiliary contacts in control circuits. This essential component is part of the robust SIRIUS modular system, ensuring reliability and long mechanical life. It is specifically engineered for use with Siemens 3RT2 power contactors and 3RH2 contactor relays.

Featuring a convenient snap-on mounting design, this auxiliary switch block is simple to install on the front of the compatible contactor/relay. It provides a versatile 2 NO + 2 NC contact configuration, identified by the terminal numbers 31/32, 41/42, 53/54, and 63/64. The connection is facilitated by reliable spring-loaded terminals, which ensure fast, secure, and vibration-proof wiring without the need for screws.

Key Benefit

• Enhanced Control Functionality: Adds four highly reliable auxiliary contacts (2 Normally Open, 2 Normally Closed) to your primary switching device, expanding control circuit options.
• Quick Installation: Front-side snap-on mounting allows for rapid, tool-free assembly onto the base unit.
• Secure & Fast Wiring: Utilizes robust spring-loaded terminals for quick, dependable, and maintenance-free electrical connections.
• High Reliability: Features a long mechanical service life of up to 10 million operating cycles and a high contact reliability suitable for demanding industrial applications.
• Compatibility: Perfectly matched for the SIRIUS family, including 3RT2 contactors and 3RH2 contactor relays, ensuring system integration and performance.

Technical Function & Specification

• Contact Configuration (Instantaneous): 2 Normally Open (NO) + 2 Normally Closed (NC)
• Terminal Designation: 31/32 (NC), 41/42 (NC), 53/54 (NO), 63/64 (NO)
• Terminal Type: Spring-loaded terminal
• Mounting: Front-side, Snap-on mounting
• Compatibility: For 3RT2 Power Contactors and 3RH2 Contactor Relays (Sizes S00 to S3)
• Rated Insulation Voltage (AC): $690V$
• Protection Class (Front): IP20
• Mechanical Life (Typical): 10,000,000 operating cycles
• Safety Features: Positively driven operation according to IEC 60947-5-1 (with 3RH2) and mirror contact according to IEC 60947-4-1 (with 3RT2).
• Operational Current (Ie​) at AC-15 (230 V): $6A$

Application

The 3RH2921-2HA22-0KT0 auxiliary switch is used in various industrial control applications to:

1. Provide feedback signals to Programmable Logic Controllers (PLCs) or other control systems.
2. Enable interlocking functions for safety and sequence control.
3. Implement additional control circuits for signaling and status indication.
4. Expand the number of auxiliary contacts when the base unit’s capacity is insufficient.

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