It only needs to be connected in series to the positive pole of the circuit, not to the negative pole. No input voltage limit. ( that the reverse voltage is lower than 40V) 300A high current MOS tube, one tube can pass 40A current and two tubes can pass 60A current 1.1 milliohm on resistance, low loss and low heating 2us fast response to reverse polarity, input and output are equivalent to diodes. When the output voltage is detected to be the input, turn off the output immediately. The detection value is millivolt level, and the corresponding speed is fast working temperature -40-125 C Model: sz-40100 Copper foil thickness: 1.5oz TYPE: B : PC+Metal colour: As shown Package Contents: 1 x diode module( 40A With terminal) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.