Circuit breakers must automatically open all phase conductors of the circuit during an overcurrent condition, except as permitted in Sec. 240.15(B)(1) through (3). For example, you can use individual ...

A typical circuit would use the base-emitter threshold voltage of approximately 0.6V of a bipolar transistor to trigger the power-supply-protection circuits. Although economical, the transistor’s ...

For the PDF version of this article, click here.. Protecting power transistors against overcurrent failure has always been a challenging issue in power circuit design.

The input overcurrent threshold is user-programmable, allowing currents up to 1.5A. A processor can control the circuit, and the circuit provides status information to the host about fault conditions.

If you are driving the transistor’s base with 0V to 5V while emitter is on 12V (Vbe is then -7V to -12V), you can’t fully turn the transistor off as there is some base current flowing at all ...

This circuit provides latching and high-speed overcurrent protection for power-factor corrected (PFC) boost converters operating at dc voltages to 380 V.

To size the branch-circuit protection for a motor, refer to 240.6(A), 430.52(C), and Table 430.150. If you're using motor controls, size and protect the motor control circuit conductors per 430.72. If ...