Noshok
300 Series Compact SPDT Mechanical Switch With Adjustable Hysteresis

Key Features

  • Ranges available from 3 psig to 30 psig through 450 psig to 4,600 psig
  • Rugged zinc-plated steel housing and process connection
  • Proven diaphragm or piston type sensing technology provides excellent reliability, repeatability, and affordability
  • Micro switch contacts are silver plated for extended service life and exceptional dependability
  • Switching functions are field adjustable while under pressure
  • SPDT single changeover contact configuration
  • Hirschmann electrical connection
  • RoHS compliant

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Application:

  • Hydraulic systems
  • Industrial machinery or machine tools
  • Stamping and forming presses
  • Pumps and compressors

SPECIFICATIONS
Adjustment ranges3 psig to 30 psig through 450 psig to 4,600 psig
Measuring elementNBR diaphragm < 225 psig; Steel piston with NBR seal > 225 psig
MediaDiaphragm type, compressed air or not corrosive liquids
Piston type, self lubricating fuids such as hydraulic oil or grease
Process connection1/4" NPT standard, others available on request
Connection materialZinc-plated steel, optional stainless steel or brass
CaseZinc-plated steel
Switching functionSPDT, micro switch with silver plated contacts,
gold plated contacts available on request
Maximum working pressureDiaphragm type: 870 psi
Piston type: 5,000 psi
HysteresisAdjustable, 10-30% depending on switch point
Repeatability±2% of full scale adjustment range
Contact ratingup to 28 Vdc   2A
up to 125 Vac  4A
up to 250 Vac  4A
Switch frequencyMax. 100 cycles/min
Durability>1,000,000 cycles
Temperature rangesStorage:  -4 °F to 176 °F (-20 °C to 80 °C)
Media:  -4 °F to 176 °F (-20 °C to 80 °C)
Ambient:  -4 °F to 176 °F (-20 °C to 80 °C)
Electrical connectionHirschmann (DIN EN 175301-803)
Environmental protectionNEMA 4:IP65
WeightApproximately 0.2 lb