ABB EH550C1 Magnetic Contactor

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1. Product Overview

The ABB EH550C1 is an industrial AC magnetic contactor used to control motors, heaters, lighting, and other electrical equipment. It operates by closing or opening main contacts via an electromagnetic coil, enabling remote automatic control. EH550C1 offers high reliability, long service life, and excellent arc resistance, making it widely used in industrial automation, power distribution, and machinery control systems.

2. Technical Specifications

• Model: EH550C1

• Type: AC Magnetic Contactor

• Rated Current (AC-3): 550 A

• Rated Operating Voltage: 690 V AC

• Coil Voltage: 24 V DC / 230 V AC (verify specific variant)

• Poles: 3 main poles + optional auxiliary contacts

• Mechanical Life: ~10,000,000 operations

• Electrical Life (AC-3): ~600,000 operations

• Mounting: Panel / DIN rail (depending on accessories)

• Auxiliary Contacts: Optional 1NO + 1NC

• Operation: Electromagnetic coil

• Operating Temperature: -25°C to +60°C

• Protection Class: IP20

• Standards: IEC 60947-4-1 / UL 508

3. Advantages & Features

1. High reliability

   • Industrial-grade design suitable for high-frequency operation and harsh environments.

2. Long service life

   • Electrical life up to 600,000 cycles, mechanical life 10,000,000 cycles.

3. High current carrying capacity

   • Supports large motor startup and high-load switching.

4. Strong arc resistance

   • Optimized contact materials and structure reduce wear and arcing.

5. Expandable functionality

   • Can accommodate auxiliary contacts, timers, or protection modules for enhanced control.

6. Standardization and compatibility

   • IEC/UL compliant, compatible with other ABB industrial control products.

4. Application Areas

• Industrial motor control (start/stop, forward/reverse)

• Power distribution systems

• Heaters, lighting, and fans control

• Machinery automation control

• Water treatment, elevators, and heavy industry

• Factory automation production lines

5. Precautions & Recommendations

1. Select proper rated current

   • Choose AC-3 rated current according to load type to avoid overloading the contactor.

2. Match coil voltage

   • Ensure control supply voltage matches contactor coil voltage.

3. Installation environment

   • Avoid high temperature, humidity, and corrosive gases; ensure proper ventilation.

4. Prevent overload and short circuit

   • Use with overload relays or fuses for protection.

5. Regular maintenance

   • Check contact wear, terminal screws, and coil status for reliable operation.

6. Safety operation

   • Disconnect power before installation or maintenance to prevent electric shock or mechanical injury.

The structure and details of the product：

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