Electronic current limiters

24 November 2010 Circuit & System Protection

Bourns has débuted its next-generation transient blocking unit (TBU) series of circuit protection devices designed to protect a broad selection of industrial and telecommunications applications.

The new series provides ultra-fast over-current protection in a wide range of trigger currents and voltages and reduced form factors.

Designated the TBU-CA series, the new devices are electronic current limiters that are triggered by excessive voltage or current. Designed as a circuit protection solution for industrial controls, medical electronics, automated test systems, and military and aerospace applications, the devices can be used for protection on Ethernet, RS485, HART and other ports where dangerous surge and power cross events may occur. They can also be used in telecom applications and provide a barrier to surges while allowing high-frequency signals such as VDSL2 to pass through without damage to the circuit.

Protecting sensitive electronics and applications from the potentially damaging effects of surges that can cause current and voltage to rise above normal operating levels, the Bourns TBU-CA series eliminates the need for large shunt protection devices by stopping the damaging currents from reaching protected circuits in less than one microsecond. The new circuit protection devices are low capacitance, single bidirectional high-speed devices designed to protect against faults caused by short circuits, AC power cross, induction and lightning surges within rated limits. The resettable devices also feature low let-through energy and overshoot protection, which reduces stress on the printed circuit board (PCB) for increased reliability and product life.

The new parts are available in five impulse blocking voltages from 250 V to 850 V with minimum trip currents of 50 mA to 500 mA featuring resistance values as low as 3 Ω.

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