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3WL Air Circuit Breakers
Air circuit breakers (ACBs), commonly referred to as 3WL series or open-type circuit breakers, are essential protective devices designed for low-voltage power distribution systems. These units are characterized by their high breaking capacity, typically ranging from 630 A to 6300 A, with configurations available in 3-pole (3P) and 4-pole (4P) ve...
Air circuit breakers (ACBs), commonly referred to as 3WL series or open-type circuit breakers, are essential protective devices designed for low-voltage power distribution systems. These units are characterized by their high breaking capacity, typically ranging from 630 A to 6300 A, with configurations available in 3-pole (3P) and 4-pole (4P) versions. They operate at rated voltages up to 690 V AC and 1000 V DC, with ultimate short-circuit breaking capacities (Icu) reaching up to 150 kA at 440 V AC. The 3WL ACBs feature advanced electronic trip units, such as the ETU series, offering adjustable protection curves for overload, short-circuit, and ground fault conditions. They support various mounting options, including fixed and withdrawable versions, and are equipped with accessories like shunt trips, undervoltage releases, and auxiliary contacts for remote monitoring and control. These breakers are designed for high reliability in industrial environments, with mechanical endurance exceeding 10,000 operations and electrical endurance up to 5,000 operations at rated current.
3WL air circuit breakers are deployed across a wide range of sectors, including power generation plants, industrial manufacturing facilities, commercial buildings, and data centers. They are typically installed in main distribution boards (MDBs), switchgear assemblies, and generator protection panels. In industrial automation, these breakers protect critical loads such as motors, transformers, and capacitor banks. Their withdrawable design facilitates easy maintenance and replacement without disrupting the entire system, making them ideal for applications requiring high uptime, such as in oil and gas, mining, and water treatment plants. They also serve as incoming and outgoing feeders in electrical substations, ensuring selective coordination with downstream protective devices.
Key subcategories within the 3WL ACB range include fixed-mounted and withdrawable versions, with frame sizes like 3WL1111, 3WL1211, and 3WL1311 covering current ratings from 630 A to 3200 A. The article code structure typically follows the pattern 3WL1XXX-XXXX, where the first digits indicate the frame size and the suffix specifies the trip unit type and accessories. For example, 3WL1111-2AA31 denotes a 630 A breaker with an ETU25B trip unit. Other common codes include 3WL1211-2AA31 (1250 A) and 3WL1311-2AA31 (2000 A). These breakers are available with communication modules like PROFIBUS or Modbus for integration into SCADA systems.
Partnering with Electric Automation Network ensures access to genuine 3WL air circuit breakers with real-time pricing and global express shipping. Our team of specialized engineers provides tailored technical support, including trip unit configuration, coordination studies, and documentation. We offer comprehensive datasheets and wiring diagrams for each article, ensuring seamless integration into your power system. Whether you need a single unit or a bulk order for a large project, we deliver with precision and speed.
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