Microswitches MK Series General purpose microswitches for heavier duty applications High precision snap action mechanism Protection degree IP20, IP40 or IP65 16A 250V AC resistive rating (I ) Versions with positive opening th Wide range of actuator styles Mechanically interchangeable with previous Screw terminals with self lifting plate products (see cross reference section) 10 million mechanical operation cycles Options & Ordering Codes G MK V 1 1 D 40 TTTerminals type Contacts type silver contacts (standard) screww terminals with self-lifffting plate V silver contacts gold plated 1 m G Contact block 1 1NO+1NC, snap action Actuator (see following pages) Max protection degree with pin 01 IP40 (with protection) 1 02 with pin 2 03 with small push butttton ................ Actuation type direct action D Attention av There are other options possible, if you can not see the option you require please contact IMO. WITH PLUNGER DIRECT ACCOTION D01 D02 D03 D04 D05 D06 D08 D09 D10 D12 D13 D15 D17 D18 D19 external rubber external rubber gasket gasket WITH LEVER DIRECT ACTIONCTION D30 D31 D32 D35 D37 D40 D42 D45D45 D46 D47 D53 D59 D49Microswitches MK Series Introduction The MK series of microswitches has been developed with added features to replace the existing MV range. The main features of the new range have been kept the same as the existing MV range to allow for interchangeability. However, extra features have increased the application fi eld where these switches can be used. The innovative feature of this series is the tripping device which has evolved with the use of modern technology, allowing added features that off er a higher number of solutions when compared with similar devices currently present in the market. The contacts of the new MK range have a higher reliability factor which has been achieved with the use of double contacts and with the possibility of use where positive opening of the contact is required. The housing has been designed so a gasket can be added as an option in order to seal the device against fi ne dust or liquids up to IP65. The terminals are more practical and allow for connection of a wider range of cable diameters. There are also options available with Fast-On terminals, with the choice of three different terminal exit an gles Contact block reliability Inthe fffollowing table we refffer tothe typical microswitch contact structure (type A) normally used intheindustryyy, compared with the innovative solution that IMO Precision Controls uses in new MK series microswitches: movable contact with single interruption and double contacts (type B). As you can see from the t A) and a lower probability of fffailure ( fffe). 2 -4 type B the probability fffe= x .This means that if in a certain situation the fffailure probability x is equal, fffor instance, to 1 x 10 (1 fffailed interruption every 10.000), we will have: - in type A one fffailed commutation every 10.000 - in type B one fffailed commutation every 100.000.000 Contact Probability of TTType Figure Description resistance R fffailure fffe A NO Contacts COMMON with single R=Rc fffe=x Common interruption NC microswitch B Contacts NO COMMON with single 2 IMO R=Rc/2 fffe x interruption and microswitch NC double contacts MK series Extended temperature range On request the new MK series are also available with an extended temperature range. Where the IMO standard MK microswitches have a temperature range of -25C +85C to , these special versions can be used in places where the ambient temperature changes from -40C to +85C leading to possible installation inside cold stores, sterilizers or other equipment using very low ambient temperatures. Special materials have been used to realize these versions and these allow the specifi cations and features to remain unchanged under these conditions, thereby widening the installation possibilities. Microswitches for safety applications All microswitches that have beside the part number are with a positive opening mechanism therefore suitable for safety applications. These microswitches are provided with a rigid connection between the actuating plunger and the NC contacts, which means these are opened by force through a strong/sturdy internal safety lever. safffety lever The positive opening is in conformity with the IEC 60947-5-1 standard and as such these microswitches are suitable for installation in protection application.