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Home » Reed switches: power, changeover, high voltage » Miniature reed switches
Miniature reed switches
Wroclaw Division of PIT-RADWAR S.A. is a producer of reed switch used to switch small and medium power (miniature reed switches), to switch high power (power reed switches), to switch high voltage (vacum reed switches) and changeover reed switch.
Miniature reed switches

Miniature reed switches
Miniature reed switches apply to connect small and medium power. The high sensitivity (Pull-in Ampere turns) of miniature reed switches allows to apply of permanent magnet.
For contact's materials of miniature reed switches are used Rutenium.
Our company produces three types of miniature reed switches:
  • ZM-110/II
  • ZM-140/II
  • ZM-109/II
Basic parameters are below. Additional information are attainable in section Documentation » Data sheets.
Parameters of miniature reed switches are tested in standard coil CP-14 ».
Technical parameter specification of miniature reed switches
Technical data Unit Type of reed switch
ZM-110/II ZM-140/II ZM-109/II
Contact form   normally open (type A)
Switching power max W 10 10 10
Switching current max A 0.5
Switching voltage DC max VDC 150 100 180
Pull-in Ampere turns AT 10÷30 10÷20 20÷35 10÷20 20÷40
Breakdown voltage min VDC 200 200 250 220 280
Contact resistance max 150 100 150
Operate time max ms 0.5 1 1
Release time max ms 0.3 0.4 0.3
Capacitance max pF 0.5 0.7 0.5
Insulation resistance min Ω 109
Resonant frequency min Hz 5000 4000 2600
  • Should the reed switches be used to switch loads different than resistive we recommend to apply a circuit protecting contacts against exissive wearing out. See in section Support » Aplication.
  • Cutting and/or bending leads may cause the increasing of AT-value. If cutting and/or bending are necessery please to comply with advices in section Support » Aplication.
Dimension of miniature reed switches
Dimension of miniature reed switches
  all dimension in mm  
  Dimension ZM-110/II ZM-140/II ZM-109/II  
  A max 41.8 max 44.7 max 55.0  
  B max 10.0 max 14.2 max 20.0  
  C max 1.8 max 2.3 max 2.54  
  D max 0.47 max 0.55 max 0.65  
see data sheets: go to:  
PDF  ZM-110/II  
PDF  ZM-140/II changeover reed switches
PDF  ZM-109/II high voltage reed switches
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ul. Poligonowa 30, 04-051 Warszawa

Wroclaw Division: ul. Krakowska 64; 50-425 Wroclaw
tel. (+48) 71 342-50-41; fax (+48) 71 342-58-59; e-mail: sales@dolam.pl