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Circuit Protection Features Broad Range of Trigger Currents

Wed, 09/08/2010 - 7:22am
Medical Design Technology
Circuit Protection Features Broad Range of Trigger CurrentsBourns Inc., a leading manufacturer and supplier of electronic components, offers the company’s 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 overcurrent protection offered in a wide range of trigger currents and voltages and reduced form factors to save valuable board space. Designated the Bourns TBU-CA Series, the devices are electronic current limiters (ECL) that are triggered by excessive voltage or current. Designed as an optimal circuit protection solution for medical electronics, the TBU-CA Series can be used for protection on Ethernet, RS-485, HART, and other ports where dangerous surge and power cross events may occur.

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 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 significantly lower let-thru energy and overshoot protection, which reduces stress on the printed circuit board for increased reliability and product life.

The series is available in five impulse blocking voltages from 250 to 850 V with minimum trip currents of 50 to 500 mA featuring resistance values as low as 3 ohms. Product samples, evaluation boards, and sample kits are available through Bourns’ distribution partners.

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