Relays are among the most vital components of most control systems. They make it possible to control large-load operations (motors, heaters, pumps, lamps) using compact and energy-efficient microcontroller-based circuits and other digital components. See below for an overview of the range of Relpol relays. It includes both classic (electromagnetic) relays and cutting-edge SSR modules.
Electromagnetic relays
SSR modules
When selecting relays intended for a given application – whether it is a large-scale installation job or a single project – you must always remember that a relay is a component that must withstand very high loads, as well as sudden voltage and current surges. Taking into account the life cycle of the entire unit, it is best to turn to manufacturers providing tried-and-tested solutions produced to meet stringent standards. Relpol definitely belongs to this group, as it has been designing and manufacturing electromechanical components for several dozen years now. Apart from the high quality of their products, the company also offers competitive prices.
Electromagnetic relays
Firstly, let us have look at the range of “classic” relays equipped with electromagnet-actuated contacts. The basic division of this product range is based on the distinction between components dedicated to industrial applications and miniature relays (used in control circuits). Apart from relays, Relpol also provides dedicated accessories, e.g. sockets for DIN rail mounting or overvoltage protection modules.
Industrial relays
The TME product catalogue includes an extremely popular selection of Relpol industrial relays. These are components with the DPDT (R2N series), 3PDT (R3N) and 4PDT (R4N) contact configuration designed to be mounted in plug-in sockets. They are developed to control typical mains loads (250 V AC) within the range from 6 A to 12 A (maximum current even up to 24 A), and also 24 V DC voltage within the same current range (depending on the model). When several pairs of contacts are utilised, R4N products can be used to close 440 V AC circuits. They are enclosed in semi-transparent bodies for easy inspection during routine maintenance or fault diagnostics tasks. Additionally, relays come with test buttons (levers on the top of the body) to lock the contacts. The range includes models controlled with 6 V DC and 12 V AC voltage (up to 220 V DC and 230 V AC), which can be used in almost all typical control circuits. The coil power consumption is 0.9 W or 1.6 VA.
R2N2012235120WTL
The top of the body is equipped with a test switch facilitating contact locking.
Miniature relays
RM85201125502401
Selected relay models are enclosed in transparent bodies.
Miniature relays provided by Relpol are designed for typical applications in controllers, white goods, as well as industrial and architectural automation solutions (lighting, automatic doors, entry phones). With their competitive prices and quality, they stand out in comparison with numerous popular brands. Similarly to the industrial product range, this catalogue category also includes components offering a wide range of performance features and functionalities. The relays come with contacts in DPDT, SPDT and DPST, SPST configurations in the normally-open (NO) variant. The nominal coil voltage ranges from 3 V to 110 V for DC and from 12 V to 230 V for AC, thus fulfilling the requirements of almost any standard project. Most models come with an ingress protection rating of IP67, i.e. they are fully protected against dust and penetration by water (and other non-corrosive liquids). The maximum current rating of contacts reaches even 24 A, with a current-carrying capacity rating of 16 A, at 250 V AC and 24 V DC. Note also that these components are designed to operate at a temperature range from -40°C to 85°C.
Interface relays
An interface relay is a modular device comprising four components. Here, an electromagnetic relay (e.g. one of the RM84 series included in the product range described above) is the basic component. Another interface relay component is a body designed to be mounted on a DIN (35 mm) rail, with a socket in which a relay can be seated (GZP80 standard). It comes with screw terminals connected to its leads. The body is fitted with a lever pressing onto a relay (to facilitate its replacement). See below for a signalling/overvoltage protection module.
PI84024ACM912012
A miniature relay is held in a socket by a lever.
An interface relay facilitates the incorporation of standard electromagnetic relays into mains circuits. This functionality is required in numerous installation types – especially in applications implemented in the field of indirect control and automation (which also include alarm systems). Compatibility with accessories such as comb connectors is an important feature of these modules.
Accessories
Relpol accessories for relays available in the TME product catalogue include mostly interface relay components, i.e. levers and sockets for DIN rail mounting (with terminals for the seating of miniature relays). This product category also comprises relay sockets for PCB (THT) mounting. Maintenance of the circuits designed with these sockets is easy, as it involves just a quick replacement of the switching element.
SSR modules
SSR modules are also described as solid-state relays. Thus “SSR” stands for ”solid-state relay”. In such relays, electromechanical components have been replaced with high-power semiconductor components that ensure: rapid response time, silent operation and excellent electrical parameters.
Single-phase solid-state relays
RSR52-24D25-R
The module base is made of heat-dissipating metal.
Relpol SSR modules come in single- and three-phase versions. The former can handle currents from 10 A to 80 A. They come in random-on (instantaneous) and zero-crossing variants, (which reduces interference and has a positive impact on the lifetime of inductive loads). The minimum switched voltage value for these modules is 24 V (and may reach even 660 V AC). Depending on the model, the control voltage can be supplied by a DC or AC source. As for direct current, values starting from 4 V are supported, which corresponds to parameters that are characteristic for numerous microcontroller-based controllers, as a large proportion of those operate at 5 V. AC-capable models are actuated after applying voltages ranging from 90 V to 280 V AC. The RSR72 relays are enclosed with heat sinks which dissipate heat and enhance the thermal characteristics of those components (operating temperatures: -30–80°C).
Three-phase solid state relays
Three-phase SSRs withstand high loads (even up to 660 V AC and 80 A) imposed by motors, ovens and other industrial equipment. Similarly to single-phase elements, they can be controlled by voltages ranging from 4 V to 32 V DC and from 90 V to 280 V AC. The control circuit is optically insulated. The maximum module body size is 78 x 105 x 38 mm. This product group also includes zero-crossing relays. They come with an LED indicator alerting about their actuation.
RSR62-48A25
This module comes not only with screw terminals, but also four mounting holes.
