Found this much:
"20 produced from Feb to May 1940 on Pz KpFw IV Ausf C and D.
Each Panzer Div bridging platoon (BL Zug) was issued 4 BL-IV, starting with the 1.Pz Div in March 1940, and also issued to 2nd, 3rd, 5th, and 10th Pz Div's in 1940.
The only weapon on board was a MG-34. The original order was for 50 BL-IV's, but the order was cut & increased to 60 because of the number of increasing Pz. Div's. As stated, 20 were produced, but the program was cancelled due in part to the campaigns in France & the Low Countries."