New Switching Possibilities from Manufacturer of Finder Relays Relays are widely used in various automation appliances and industrial robots, therefore, there has been increasing interest in these mechanisms. A variety of different relay types is in existence, but electromagnetic and solid relays are, perhaps, the most widespread. The latter have been developing rapidly only since very recently, but due to special features and rather low limit voltages and currents the scope of applications for these components is significantly limited. Therefore, conventional electromagnetic relays consisting of a coil, magnetic material core, a pusher and a contact group are far from becoming obsolete.
When selecting a specific relay model, customers consider the initial classification of various models in the manufacturer’s catalogue, which can vary between different companies. Relays can be classed by many various features, but we will confine ourselves to the features that occur most frequently. In terms of the initial state of contacts, there exist relays with normally closed, normally open and switching contacts. The following groups can be distinguished by control type: DC/AC relays, polar and non-polar relays, and combined relays. And finally, the last widespread classification is by capacity that distinguishes lowa capacity relays, medium and high capacity relays.
Let us consider briefly the basic differences of electromagnetic relays [1]. Due to design-related features this relay type allows for various contact configurations,which made them a popular choice for many different types of equipment. Among other no less important specific features of special importance are high immunity to overload and short circuits, low contact resistance (which is significantly lower than with open semiconductor junction), and constant capacity of control circuit which does not depend on the load.
High immunity to impact of external magnet and electrical fields and a smaller outer dimension as compared to semi-conductor relays at higher loads to be switched are also ‘pro’ arguments when selecting this type of relays. Lastly, the price of electromagnetic relays, as a rule, is lower that the price for similar semi-conductor solid relays.
Finder Relays Company (www.findernet.com) is an internationally famous Italian manufacturer of various relays, a leading European manufacturer of electro-mechanical relays and timers was founded in 1954. The company specializes in manufacturing of relays and timers. At present the company manufactures over 10 000 various models, and offers the widest assortment of product lines in the world. The offered relays are intended for assembling on printed circuit boards, interface modules etc. For instance, subminiature relays with double-row output arrangement for currents up to 2 A (30 series), miniature relays for 6 A current for assembling on printed circuit boards (32 series), ultra-thin relays for assembling on printed circuit boards for operating currents 0.1, 2 and 6 A (34 series), miniature relays in version for assembling on printed circuit board and currents up to 10 A (36 series), miniature PCB-relays for maximum currents 8, 10 and 16 A (40 series), low-profile PCB-relays for currents 8, 12 and 16 A (41 series), low-profile relays with maximum permissible currents 10 – 16 A (43 series), miniature PCB-relays (44 series for currents 6 – 10 A and 45 series for currents up to 16 A), protective relays for currents up to 8 A (50 series), miniature industrial relays for currents up to 8 – 16 A (46 series), general purpose miniature relays with maximum permissible current 7 – 10 A (55 series), miniature power relays for current up to 12 A (56 series), as well as general purpose relays (60 series with maximum current up to 6 – 10 A, 62 series – up to 16 A, 65 series – currents up to 20 – 30 A and 66 series – up to 30 A). As may be seen, due to such a variety in the product line, which is comprised of relays used for different purposes, one can always select the appliance which is ideal for a particular application.
Recently this great product line was widened with new relay type of 50.12 series with forcedly opened contacts. The relay is shown on fig. 1, and its contact group diagram – on fig. 2.

Appearance of the 50.12 series relay Contact group diagram of
50.12 series relay
In terms of specification and appearance this series has considerable resemblance to 40.52 series relay. As with 40 series, the new 50.12 series relay is also designed for printed circuit boards and has two switchable contacts with rated current 8 A and switching voltage up to 250 V. It has about the same outer dimension as 40.52 series relay (29=12.4=25 mm), and is able to function normally within the temperature range between -40 and +85°С. It has good dielectric isolation between the coil and the contacts – up to 6 kV.
However, the inner design of the 50.12 series relay differs considerably from the 40.52 relay, as the contacts of 50.12 relay are mechanically bound. They have been designed in such a manner to make sure that in case one contact cannot change its state due to the mechanical lock-out, ‘jamming’ or slight melting, then the opposite contacts become locked. Thus, the signal from one of the bound contacts reliably reports the status of the opposite contact. This feature is of great importance for systems requiring high reliability.
Due to mechanically bound contacts this relay features higher reachable switching ability, than 40.52 series relay. In DC1 mode interrupting capacity of 50.12 relay is 0.2 A at the voltage of 220 V (DC).
Most important specification of the new 50 series relay are presented in table 1.

It should be noted, that relay contact materials do not contain cadmium (this is in compliance with RoHS European Directive which limits application of hazardous materials in electronic and electric engineering equipment).
Besides the relay with forcedly opened contacts of 50.12 series, Finder Relays also offers two new all-purpose relays for printed assembly. This is the 46.52 series (fig. 3) with two switchable contacts for 8 A and the 46.61 series (fig. 4) with a single switchable contact for current up to 16 A.

Appearance of 46.52 series relay Appearance of 46.61 series relay

In essence, they are similar to 40 series relays, but have additional abilities: a locked test-button, a mechanical indicator and a LED. Earlier such options were available only for all-purpose intermediate relays with a large number of switchable contacts and power relays. Now these options are available also for relays with less capacity.
Relays of 46.52 and 46.61 series can be installed both on printed circuit boards, and DIN-rails in two manners: either using regular 97 series adapters, or using flange 046.05 and 046.07 adaptors specially developed for this purpose. Main specification of new 46.52 and 46.61 series relays are given in table 2.

The new relay series respond to the growing market demand for appliances of this class, and in the near future new models will be added to the product range.
ITC-Electronics offers you Finder Relay products to be delivered under beneficial conditions. Choose reliability and quality.

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