Broken off. As soon as I turned on the power, the second block popped up and showed no output voltage. The input voltage was 47.6 V. The first device ran for about three minutes and then failed (same setting for 12 seconds). This is the only 12 second BEC I found on Revain so I really wanted it to work for me. My guess is that this block might need a minimum load (output) to work properly and the error could be due to an insufficiently high load on the output. Any product information on this requirement would be helpful. I will change my rating if this information is added (and it is true). I bought four of these units, two left.