Centrifugal electric pumps single impeller

The close-coupled centrifugal electric pumps with one impeller series STM have been designed to pump clear liquids, without abrasives and suspended solids, non-explosive or aggressive for the pump’s materials

  • Liquid temperature not higher than 35 °C for domestic use (CEI EN 60335-2-41) or 90 °C for other use, while the ambient temperature must not be higher than 40 °C
  • Flow rate up to ~ 18 m3/h
  • Heads up to ~ 60


  • Pump body : cast iron G20 with anti-corrosive coating
  • Motor bracket : die casting aluminium UNI 5076 (cast iron for STM 150-550)
  • Impeller : techno-polymer (stamped brass UNI- EN 12165 for STM 150-550)
  • Pump shaft : stainless steel AISI 304 (AISI 420 F for STM 50-100)
  • Mechanical seal : carbon – ceramics


The control motors are asynchronous, squirrel cage-type, closed, with external ventilation

  • Incorporated motor protection and capacitor always on, for single-phase models
  • The motor protection for three-phase models must be installed by the customer. Equipment compliant with current standards should be used
  • Class of insulation F
  • Service S1
  • Degree of protection IP 44, STM 400-550 IP 44 single-phase (IP 55 on demand) and IP 55 three-phase
  • Terminal board protection IP 54.