ABB 1SFN010820R3311 Auxiliary contact block

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1. Product Overview

The ABB 1SFN010820R3311 Auxiliary Contact Block is designed for ABB low-voltage switching and control devices. It provides additional auxiliary contacts for status indication, interlocking, and signal expansion. The block is mounted onto compatible ABB contactors, switch disconnectors, or switchgear, enabling reliable feedback of the main device operating status to control systems.

2. Main Technical Parameters (Typical)

Contact Configuration

• Contact type: Auxiliary contacts

• Contact arrangement: 3NO + 3NC

Rated Data

• Rated insulation voltage (Ui): 690 V AC

• Rated operational voltage (Ue): up to 690 V AC

• Rated operational current (Ie):

  • AC-15: approx. 6 A

  • DC-13: approx. 3 A

Service Life

• Mechanical life: ≥ 1,000,000 operations

• Electrical life: In accordance with IEC 60947 requirements

Mounting

• Modular plug-in or side-mounted installation

• Direct mounting on compatible ABB main devices

Terminals

• Screw terminals

• Suitable for solid and stranded conductors

Standards

• Complies with IEC / EN 60947-5-1

• Suitable for industrial control and distribution systems

3. Advantages and Features

• High contact density with multiple NO and NC contacts

• Perfect compatibility with ABB devices

• Reliable contact performance for accurate signaling

• Modular design for easy installation and replacement

• Long service life for frequent operation

4. Typical Applications

• Status indication of low-voltage contactors and switches

• Industrial automation control systems

• Interlocking and signaling in power distribution

• Motor control circuits

• Process control and equipment interlock systems

5. Application Notes

• Ensure compatibility between the auxiliary contact block and the main device

• Select contact ratings according to control circuit voltage and current

• Disconnect control power before installation

• Tighten terminals with specified torque to ensure good contact

• Periodically inspect contact condition in high-duty applications

The structure and details of the product：

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