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Cam switches VSR

As of 2010, we're also offering cam switches with straight clams - VSR series with amperages of 10 A, 16 A, 20 A.


  • Switches from the VSR line are cam switches with switching programmes comprised of the shape and number of cam cuts.
  • The design of the switch makes it possible for two mutually independent switching circuits to be in each level.
  • Circuits can be joined together by standardized couplers, both same-level and between levels.
  • Switches are mounted to the panel using M4 screws according to the drilling layout specified for each type. From seven levels onward, it is recommended to mount the switch from the front and back, with respect to the mechanical strength and load from wires.
  • All conducting parts are made of brass, copper or silver. Other parts are made of plastic.
  • The basic design meets the IP 20 protection standard for the switch body and the IP 65 protection standard for the front sealed side with shaft.
  • Switches are insulation class I and II appliance compliant.
  • Cam switches can be used in control and power circuits.
  • Cam switches exceeding 250 A are supplied in cooperation with KRAUS & NAIMER.


IP 20 protection

  • The basic design meets the IP 20 protection standard for the switch body and the IP 65 protection standard for the front sealed side with shaft.

Switch assembly:

  • The switch can be mounted by the face from the front or by the back from the back folding panel. A universal "rear anchor panel", which mounts the switch using both screws and DIN panels, can be ordered separately. "Rear mounting" switches that are ordered already contain this universal "rear mounting panel" (including the DIN panel fixation option).



  • These switches are designed for common and tropical environments, with ambient temperatures of up to 55 °C.
  • The manufacturer recommends using the rotary switch included with the basic line.
  • Special programmes can be established based on an agreement with the manufacturer.
  • VSR10 - 16 - 20 switches are supplied with plastic covers for four levels (OK4) and up to six levels (OK6). Protection corresponds to IP54
  • In case none of the catalogue switches meet your demands, you can use the Atypical switching programme specifications form with copying option to define the desired switching programme. Please send this clarification via e-mail to ots@obzor.cz.
  • The production of atypical switches shall be discussed with the manufacturer.

Method of identification:

The catalogue numbers for cam switches is based on the character sequence. See the following example to achieve a better understanding:

VSR16 1103A8-V-PNC-S-201-NSC-R21
  • VSR16 - series indicating the nominal working current (in our case 16 amps)
  • 1103 - wiring diagram type (switching and disconnecting individual contacts)
  • A8 - indicates the basic shaft rotation positions with cams and the switching angle
  • V - method of assembly to panel with plate
  • PNC - front panel
  • S-201 - silver plate with label 0-1
  • NSC - arrow type on switch shaft
  • R21 - special design with reverse to specified position

Select and specify switches based on the following steps:

  • choose the nominal working current according to the basic technical data tables
    • VSR10 = 10 A
  • choose the switching diagram from chapter" diagram number"
    • 1104 = four contacts switched in a cycle 0 - 1
    • 9455 = single-phase motor switch and others
  • choose the rotary angle and home position for the switching diagram from chapter "diagram number"
    • A8 = switching angle 45 degrees, zero position at "12 o' clock"
    • C1 = switching angle 30 degrees, zero position at "12 o' clock" and others
  • choose the method of assembly
    • V - method of assembly to panel
    • Z = rear mounting of switch including mounting to DIN panel
  • choose the front panel
    • ANC = 50x50 mm
    • PNC = 66x66 mm
  • select control arrow
    • NMC - small black arrow
    • NSR = medium red arrow
  • define accessories to cam switch
    • BZ = block lock
    • R21 = design with reverse
  • finally, define the protective cover, if applicable
    • OK4 = protective plastic cover and others




Cam switches comply with the requirements of the ČSN EN 60 947-1 and ČSN EN 60 947-3 article 2.3 - disconnectors standards and are considered suitable for the defined external influences AB2-AB7.

All cam switches can be used for a nominal voltage of 400V AC and 500V AC.

In spite of this, however, we recommend consulting the designer when selecting cam switches for the relevant external influences.

Examples of establishing diagram numbers
Examples of programme multiplicity and accuracy of types:










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