NS20 Cam Switch

The NS20 is a very robust rotary cam switch with 12 mm diameter metal square shaft, aluminum nameplate, and cam-actuated contacts. The switch contacts, embedded in double contact modular blocks, with positive break by the cam discs, are available in three different versions. A special gold-plated version is suited for low voltage applications. A silver contact editions is designed for standard applications. And, finally, an edition using a permanent magnetic blowout is for direct current set-ups.

The NS20 rotary cam switches handle control tasks in switch panels, control stations and on-deck control stations. The can be equipped with metal notched discs from the Spohn & Burkhardt modular program, with customised positive-locking flanged potentiometers or with encoders that fit the customer's specifications. Call one of the Elma product engineers for advice & the possibilities for customized cam switches.

Max. protection class outside / inside IP54 / IP00
Installation from below
Number of notches 5
Spring return yes
Friction break yes
Operating temperature -40°C / +60°C
Switching cycles min. 10 milion
Max. Voltage / Current 230V / 16A
Max. number of contacts per direction of movement 24
Sensor types Potentiometer, Encoder, Hall
Type of desired output signals

4-20 mA or 0-20 mA
-10 .... +10 volt DC
-2,5 .... + 2,5 volt DC
0 .... +5 volt DC (digital)
-10 .... +10 volt DC pp (PWM)
0 .... +5 volt DC pp (PWM)

BUS systems ProfiNet, ProfiBus, SAE J1939, CAN(open), ...
Analog output resistance
CSA yes
UL yes
Rotating drive yes