Eaton FD3150KW Molded Case Circuit Breaker (3150A)

The Eaton FD3150KW is a large‑frame molded case circuit breaker designed for heavy‑duty power distribution applications. With a continuous current rating of 3150 A at 600 VAC, it is commonly used as a main disconnect in switchboards, panelboards, and industrial control panels. The breaker incorporates a thermal‑magnetic trip unit that provides both overload and short‑circuit protection, ensuring reliable operation and selectivity in low‑voltage networks.

Key Features

• Frame: FD series, 3‑pole

• Current rating: 3150 A (fixed)

• Voltage: 600 VAC maximum, 50/60 Hz

• Interrupting capacity: 65 kA RMS symmetrical at 480 VAC; 35 kA at 600 VAC (UL489)

• Thermal‑magnetic trip: fixed thermal (overload) and adjustable magnetic (short‑circuit) via dial

• Magnetic trip adjustment range: 5x to 10x of rated current

• Connection type: I‑Line plug‑in or bolt‑on (field convertible)

• Line and load terminals accept large conductors or bus bars

• Accessories: auxiliary switches, alarm contacts, shunt trip, undervoltage release available

Technical Specifications

Protection Characteristics

The thermal element uses a bimetal strip that responds to prolonged overcurrents, providing time‑inverse protection against overloads. The magnetic element reacts instantaneously to short‑circuit currents above the adjustable threshold. This two‑stage protection ensures that minor overloads are tolerated for short periods, while severe faults are cleared rapidly to minimize damage.

Applications

• Main circuit breaker in switchboards and distribution panels

• Feeder protection for large industrial loads

• Transformer secondary protection

• Generator output breakers

• Retrofit of older switchgear

Installation and Accessories

The FD3150KW can be mounted via I‑Line fingers for Eaton panelboards or with bolt‑on lugs for custom bus connections. Optional accessories include a motor operator for remote switching, a rotary handle for external operation, and various auxiliary contacts for status indication. The breaker’s compact design allows high density in switchboard construction.

With its high interrupting capacity and robust construction, the Eaton FD3150KW molded case circuit breaker provides dependable protection for critical power systems.