Designation Dimensions, cm Protective area b(min) Protective area I (min)
  L B H m m
PR2R 311515 310 150 150 2  2
PR3R 491515 490 150 150 3  2
PR3R 491512 490 150 120 3 2
PR1R 161517 160 150 170 3 10
PR1R 301010 300 100 100 2 2