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Home » Reed switches: miniature, changeover, high voltage » Power reed switches
Power 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.
Power reed switches

ZW-103, ZW-104
Power reed switches are appropriated for switching big loads. They are applied in our sensors DH 96, DH 99.
Tungsten is used as contact's material for our power reed relay.
Our company produces two types of power reed switches:
  • ZW-103 - max switching power 60W
  • ZW-104 - max switching power 180W
Reed switches ZW-103, ZW-104 with flat leads are approachable as ZW-103R, ZW-104R.
Basic parameters are below. Additional information are attainable in section Documentation » Data sheets.
Parameters of power reed switches are tested in standard coil CP-11 ».
Technical parameter specification of reed switches ZW-103, ZW-104
  Technical data Unit Type of reed switch
Contact form   normally open (type A)
Pull-in Ampere turns AT 40÷60 60÷100 40÷60 60÷110
Switching power max W 60 180
Switching voltage DC max VDC 300 400* 300 400*
Switching voltage AC max VAC 230 250* 230 250*
Switching current max A 3 3(7**)
Carry current min A 5 5
Contact resistance max 100 150***
Breakdown voltage min VDC 500 600 400 600
Operate time including bounce time max ms 2.5
Release time max ms 0.2
Insulation resistance min Ω 1010
* For switching voltage over 230VACor 300VDC contact layer may be damaged.
Therefore the switching current should be reduced for example to 2mA at 250VAC or 400VDC for ZW-103 i ZW-104.
** Current rush within max 2ms.
*** Contact resistance is measured with an open contact voltage of 36VDC and the current through the closed contacts of 50mA, using the 4-point method.
  • 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 reed switches ZW-103, ZW-104
Dimension of reed switches ZW-103, ZW-104

ZW-103R, ZW-104R
ZW-103R, ZW-104R
  all dimension in mm  
Wymiar ZW-103
A max 85 max 82
B max 50
C max 5.5
D 1.4
E n/a 1.9÷0.1
F n/a max 0.8
see data sheets: go to:  
PDF  power reed switches   miniature reed switches
changeover reed switches
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