TECHNICAL DATASHEET Microswitches MS Series General purpose microswitches for heavier duty applications n n High precision snap action mechanism Protection degree IP20, IP40 or IP65 n n 16A 250V AC resistive rating (I ) Versions with positive opening th n n Wide range of actuator styles Mechanically interchangeable with previous products (see cross reference section) n Screw terminals with self lifting plate UL and cUL Approvals n n 10 million mechanical operation cycles Options & Ordering Codes MS ST C1 1 D A01 G Terminal Type Screw terminals with self-lifting plate ST Contacts Type Silver contacts (standard) Contact Block Silver contacts gold plated 1 m G 1NO+NC, snap action C1 Actuator (see following pages) Max. Protection Degree With pin IP40 (with protection) A01 1 With pin IP65 (with protection) A02 2 With small push button A03 Actuation Type ................. Direct action D Back direct action B ATTENTION The feasability of a code number does not mean the effective availability of a product. There are other options possible, if you can not see the option you require please contact IMO. Inverted action R www.imopc.comTECHNICAL DATASHEET Microswitches MS Series Introduction The MS 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 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 oer a higher number of solutions when compared with similar devices currently present in the market. The contacts of the new MS range have a higher reliability factor which has been achieved with the use of double contacts which are also used 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 fine 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 dierent terminal exit angles. Contact Block Reliability In the following table we refer to the typical microswitch contact structure (type A) normally used in the industry, compared with the innovative solution that IMO Precision Controls uses in new MS series microswitches: movable contact with single interruption and double contacts (type B). As you can see from the table below, this last structure (type B) offers half of the contact resistance (R) than the simple mobile contact (type A) and a lower probability of failure ( fe). In fact, defined x the probability of a commutation failure of a single interruption, it results that in the type A the failure probability fe=x, in the type B the probability fe= 2 x . This means that if in a certain situation the failure probability x is equal, for instance, to 1 x 10-4 (1 failed interruption every 10.000), we will have: - in type A one failed commutation every 10.000 - in type B one failed commutation every 100.000.000 Extended Temperature Range On request the new MS series are also available with an extended temperature range. Where the IMO standard MS 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 specications and features to remain unchanged under these conditions, thereby widening the installation possibilities. To have this option, add suffix H6 to the part number. Microswitches For Safety Applications All microswitches that have beside the part number have 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. 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. www.imopc.com