Eaton WMS3B20 20A 3-Pole 600 V Circuit Breaker Potential Transformer

Meet the Eaton WMS3B20, a rugged three-pole circuit breaker engineered for dependable protection in demanding electrical systems. With a 20 A current rating and a 600 V maximum voltage, this unit is built to handle the rigors of modern industrial and commercial installations while keeping critical equipment guarded against overloads and short circuits. The WMS3B20 carries the part number you’ll reference for quick ordering and replacement, ensuring seamless maintenance in busy control panels.

The three-pole design provides synchronized disconnection across all phases in a three‑phase system, reducing the risk of phase imbalance during fault conditions. This is especially important for three‑phase motors, compressors, conveyors, and other heavy loads where uneven shutdowns can cause equipment damage or roll‑over faults. Paired with protection schemes that utilize potential transformers, the WMS3B20 supports accurate monitoring and reliable tripping in protective relays and metering setups.

• Current rating: 20 A
• Poles: 3 (three-phase protection)
• Voltage rating: 600 V
• Part Number: WMS3B20
• Designed to integrate with protection and measurement schemes involving potential transformers
• Ideal for installation in industrial control panels, equipment enclosures, and commercial power distribution

Why this matters for your system

Choosing a 3‑pole 20 A breaker like the WMS3B20 simplifies panel design by consolidating phase protection into a single device, reducing wiring complexity and installation time. Its 600 V rating accommodates a wide range of equipment and circuits, while the robust Eaton build quality delivers reliable trip performance when faults occur. This makes it a practical choice for facilities aiming to improve uptime, protect valuable assets, and maintain safe, predictable electrical operation.

Ideal use cases

Use the Eaton WMS3B20 for:

• Three‑phase motor control circuits in manufacturing lines
• HVAC and refrigeration system protection in commercial facilities
• Power distribution panels where three‑phase reliability is critical
• Systems employing potential transformer-based metering or protection schemes

In short, the WMS3B20 is a purpose-built solution for reliable three‑phase protection at 600 V, combining straightforward installation with precise, coordinated trip behavior. It’s a smart, durable choice for engineers and technicians who design and maintain robust electrical infrastructure.