PEC12R Incremental Encoders Bourns PEC12R Incremental Encoders offer a compact design, long-life, and high reliability. These encoders are available in a wide variety of configurations to meet many user requirements. The 12mm PEC12R encoders are also available with a momentary push switch option. These encoders feature 2-bit quadrature code output, IP 40 rating, and 3 standard shaft length variants.Typical applications are level control, tuning and timer settings in audio-visual equipment, and consumer electric appliance.