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The FA3-PB-16-845-21A-BT is a robust three-pole circuit breaker manufactured by Littelfuse Inc. Designed for industrial electrical distribution systems, this component delivers a continuous current rating of 450 amperes at a voltage rating of 277 volts. The unit utilizes a magnetic hydraulic delay tripping mechanism to ensure reliable overload and short-circuit protection while minimizing nuisance trips during inrush currents.
Mechanically, the breaker employs a chassis mount configuration, allowing secure installation onto control panels or switchgear enclosures. Operation is facilitated through a direct lever actuator, providing clear manual on/off status and reset capability. The device carries CCC and UL489A approval agency certifications, verifying compliance with established safety standards for molded case circuit breakers. Illumination is not integrated into this specific model.
Engineers and procurement specialists utilize this high-amperage breaker for heavy-duty motor circuits, transformer protection, and main distribution busbars where rapid fault clearing and durable mechanical operation are required. The combination of high current capacity and standardized mounting makes it suitable for demanding commercial and industrial power management applications.
The device operates at a rated voltage of 277 volts.
It is configured as a three-pole protective device.
A manual lever actuator is used for switching operation.