ABB EHW-250W Welding Isolation Contactor

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1. Product Overview

The ABB EHW-250W is a high-performance welding isolation contactor designed for welding equipment and industrial power systems. It provides power isolation during welding operations, ensuring operational safety and preventing electrical faults. This contactor is suitable for AC welding power supplies, welding robots, and automated welding production lines, offering high reliability and long service life.

2. Technical Specifications

Electrical Specifications

• Model: EHW-250W

• Type: Welding Isolation Contactor

• Rated Voltage: 690 V AC

• Rated Current: 250 A

• Poles: 3P (Three-pole)

• Coil Control Voltage: 24 V / 48 V / 110 V / 220 V AC/DC (optional)

• Switching Capacity: 125 kW (400 V AC3)

• Mechanical Lifespan: ≥ 500,000 operations

• Electrical Lifespan: ≥ 200,000 operations

• Protection Features: Overload and short-circuit protection (with fuses)

Environmental & Installation

• Operating Temperature: –25°C … +60°C

• Protection Degree: IP20 (standard, optional IP40)

• Mounting: Panel or DIN rail mounting

• Dimensions (HxWxD): 280 mm × 150 mm × 180 mm

• Weight: Approx. 10 kg

Additional Features

• Fast electromagnetic action for rapid response

• Can be combined with auxiliary contacts and thermal overload relays

• Supports remote control and integration into automated welding systems

• Compact design suitable for long-term industrial operation

3. Advantages & Key Features

1. High reliability — Industrial-grade design ensures safe operation of welding equipment.

2. High current capacity — Supports 250 A welding load and inrush current.

3. Fast response — Suitable for instantaneous switching in welding processes.

4. Easy maintenance — Removable module design for quick replacement and servicing.

5. High safety — Lockable and fuse-protected for full power isolation.

6. Industrial adaptability — Reliable in high temperature, humidity, and frequent operation environments.

4. Application Areas

• AC welding power supply control

• Automated welding production lines

• Welding robot systems

• Industrial equipment power isolation

• High-power motor and industrial load control

• Welding and cutting equipment power management

5. Precautions

1. Verify power supply voltage and load match the contactor specifications before installation.

2. Ensure all wiring is secure for reliable contact.

3. Install in a dry, well-ventilated environment, avoiding dust, moisture, and corrosive gases.

4. Operate within rated current and switching capacity, using fuses for protection.

5. Regularly inspect contact points and coil status to ensure welding operation safety.

6. Perform insertion and removal with power off to prevent electrical shock and equipment damage.

The structure and details of the product：

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