Product Overview

The 3RH2921-1DA20 is a lateral auxiliary switch designed for expanding auxiliary contacts in control circuits. This snap-on side mount auxiliary contact block features 2 normally open (NO) contacts with screw terminals and is specifically designed for use with 3RT2 contactors and 3RH2 contactor relays. The compact design provides reliable switching capabilities for industrial automation applications.

Key Features

Contact Configuration: 2 normally open (NO) contacts provide additional switching capabilities for control circuit expansion.

Mounting Type: Lateral (side) mounting design allows for tool-free installation on compatible contactors without affecting the main device's footprint.

Terminal Configuration:

• Left side terminals: 53/54, 63/64
• Right side terminals: 33/34, 43/44
• Current path: 1 NO, 1 NO

Terminal Type: Screw connection terminals provide secure and reliable electrical connections suitable for industrial environments.

Compatibility: Designed for use with 3RT2 contactors and 3RH2 contactor relays, ensuring seamless integration with existing SIRIUS systems.

Technical Specifications

• Contact Type: 2 NO (Normally Open)
• Connection Type: Screw terminals
• Mounting: Lateral (side mount)
• Current Path: 1 NO, 1 NO
• Net Weight: 0.039 kg
• Packaging Dimensions: 62.00 x 75.00 x 24.00 mm
• Country of Origin: Romania

Applications & Benefits

The SIRIUS 3RH29 auxiliary switches are engineered for expanding auxiliary contacts in control circuits. These auxiliary switches can be laterally mounted onto 3RT2 contactors without tools regardless of their size, providing flexibility and ease of installation.

The 3RH29 auxiliary switch blocks are available as versions for front or lateral mounting, with up to four instantaneous contacts or up to two leading NO and NC contacts. The auxiliary switches can be designed as positively driven contacts in 3RH contactor relays or also as mirror contacts in the case of 3RT power contactors.

Key Benefits:

• Tool-free lateral mounting capability
• Compact design for space-efficient installation
• Standard-compliant terminal designations
• Climate-resistant construction
• High contact reliability
• Worldwide approval compliance (e.g., IEC and UL/CSA)

Installation & Compatibility

The auxiliary switch block can easily be snapped onto the side of compatible contactors. The auxiliary switch block has a centrally positioned release lever for disassembly. This model is compatible with:

• 3RT2 contactors (all sizes)
• 3RH2 contactor relays
• Size S0 contactors (3RT2023 through 3RT2028)
• Size S2 contactors (3RT2035 through 3RT2038)

Only one 3RH2921-1DA20 auxiliary can be installed per contactor, but additional two and four pole front mounted auxiliaries are also available for expanded functionality.

Quality & Compliance

• RoHS Compliance: Since 01.10.2009
• Product Lifecycle: PM300: Active Product
• Export Control: AL: N / ECCN: N
• WEEE Compliance: Take-back obligation applicable
• EAN: 4011209790292
• UPC: 662643908503

Product Classification

• eClass: 27-37-13-02
• ETIM: EC000041
• UNSPSC: 39-12-15-22

Download existing graphical data for this product:

• Product Datasheet
• Instantaneous Auxiliary Switches Product Family
• Online Support Portal
• 3D Models and Technical Drawings
• SIRIUS Contactors Manual
• SIRIUS Innovations System Overview
• SIRIUS 3RT2 Contactors Manual