Product Overview

The ABB AF400-30 is a heavy-duty 3-pole contactor from ABB's AF contactor family. It is designed for switching power circuits and controlling large three-phase motors. The AF400 series supports main-circuit voltages up to 1000 V IEC and is rated for motor applications up to 200 kW at 400 V AC-3.

The AF400-30 uses ABB's electronic AF coil technology. This allows a wide control-voltage range and helps the contactor remain stable when the control supply experiences voltage variations.

Technical Specifications

These ratings describe the AF400-30 family. The exact coil voltage and auxiliary-contact configuration depend on the complete suffix. For example, ABB lists AF400-30-11 variants with control-voltage ranges of 48–130 V, 100–250 V, and 250–500 V AC/DC.

Main Features

The AF400-30 is designed for demanding switching applications. Its principal features include:

• Three main power poles
• AC/DC electronic coil operation
• Wide control-voltage capability
• Built-in surge suppression
• Reduced control-panel energy consumption
• High motor-switching capacity
• Main circuit bars for high-current connections
• Compatibility with add-on auxiliary contact blocks and accessories

ABB also states that the AF400 family can handle large control-voltage variations and provides distinct opening and closing behavior.

Construction and Operation

The contactor uses a block-type construction with three main poles. When the control coil is energized, the magnetic system moves the contact carrier and closes the main contacts. Removing the control signal allows the contact mechanism to return to its normal position.

Auxiliary contacts can be incorporated for control, indication, and interlocking functions. This makes the AF400-30 suitable for larger motor-control assemblies where both power switching and control feedback are required.

Typical Applications

Because of its high current and motor-power capability, the AF400-30 is intended for heavy-duty industrial switching applications, including:

• Large three-phase motor starters
• Industrial machinery
• Motor isolation and bypass circuits
• Power distribution systems
• Manufacturing equipment
• HVAC and large electrical loads
• Industrial automation control panels

The AF400 family is specifically designed for controlling three-phase motors and power circuits up to the applicable voltage and current ratings.

Installation & Maintenance

Before installation, verify the complete AF400-30 suffix, especially the coil-voltage code and auxiliary-contact configuration. These details determine the correct control supply and connection arrangement.

The main circuit should be wired according to the applicable current, voltage, conductor, and protection requirements. ABB documentation specifies bar-type main-circuit connections for AF400 variants.

During maintenance, inspect the main terminals, auxiliary contacts, control connections, and mechanical operation. Keep the contactor free from excessive dust and moisture. Also check for signs of overheating or abnormal contact wear.

For replacement projects, matching the complete ABB order code is recommended rather than relying only on the general AF400-30 designation.