ABB's latest breaker innovation delivers a new range of UL485 current limiting breakers, up to 400A, provide the lowest let-through current, the highest interrupting capacities, in the smallest package. The high speed operation and exceptional performance of the Tmax UL Current Limiting breaker can limit potential damage by reducing the peak let-through current (Ip) and let-through energy (I2t) in the event of a short circuit.

Smaller, Faster, Safer The T2H, T4H, T5H, T4V and T5V 3 pole molded case circuit breakers, are now UL489 listed as current limiting circuit breakers through 400A.

Superior performance combined with the smallest footprint available

By combining superior performance with the smallest footprint available, Tmax breakers deliver considerable savings in both component cost and reduced space within switchboards and controls panels. By limiting both the peak let-through current and the let-through energy, current limiting breakers protect the circuit conductors and downstream components from damage due to excessive heat and mechanical stress.

Benefits of Selecting UL489 Current limiting Breakers:

• Reduced stress on downstream components
• Reduced control panel size – may eliminate fuses and holders
• Interrupts and isolates a fault in less than ½ of an AC cycle

Let-through & Limit Curves

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