How do you check kbpc2510 bridge rectifier?

Answer 1

The KBPC2510 is a silicon bridge rectifier rated 25 amps forward and 1000 volts reverse. To test it, you need an ohmmeter that has at least 2.4 volts of open circuit voltage.

Take the bridge out of the circuit.

Start by checking from AC terminal to the other AC terminal. (Two tests.) There should be no conductivity in either direction.

Now check from DC terminal to the other DC terminal. (Two tests.) You should get conductivity when the meter's plus lead is on the minus output (anode) and no conductivity the other way. When you get conductivity, it should not appear as zero ohms.

Now check from each AC terminal to each DC terminal. (Eight tests.) You should get conductivity when the meter's plus lead is on the minus output (anode) or the meter's minus lead is on the plus output (cathode). This conductivity will appear to have less resistance than the prior test, but it should still not be zero ohms. Again, there should be no conductivity when the leads are reversed.

In all, you are making 12 measurements, two across each diode, and two across opposite corners of the bridge.

This is only a low current test. In all probability, if the bridge passes this, it is OK. If you want a higher current test, you could do various things, but all of them involve risk of electrocution and/or damage.

CAUTION: USE PROTECTIVE MEASURES TO PREVENT ELECTROCUTION AND/OR DAMAGE TO THE BRIDGE OR EQUIPMENT. USE APPROPRIATE CLIP ON TEST LEADS AND DO NOT TOUCH ANYTHING WHEN THE POWER IS ON.

You could wire a 120VAC source to a bulb, say of 150 watts. Complete the circuit, one at a time, to each of the 6 combinations through the bridge. If the bulb glows brightly in any one path, that path is shorted. If it glows at quarter power (half current), that path is normal. If it does not glow, that path is open. (Remember: The path from AC to AC should appear open - all other paths should appear normal.) Note that this test is only using one and a quarter amps.