The POK series is made up of five basic models, created from a single module with two contacts that can be used in multiple combinations to provide solutions with 2 - 4 - 6 - 8 and 12 change-over contacts.

The construction of the relays and careful choice of the materials are such that they ensure long life and considerable ruggedness even in harsh operating environments and in the presence of strong temperature fluctuations.

A specific treatment (P5GEO or P6GEO) combining coil tropicalization with gold-plated contacts allows the use of these items in geothermal electric power stations, as relays for signaling functions, for controlling intermediate devices and for all non-power circuits.

Excellent electrical and mechanical performance levels allows the product to be used in the most demanding of sectors such as, for example, control and signaling functions in electricity generating stations, electrical transformer stations, rail transport or in industries with continuous product processes (chemical industry, petroleum industry, rolling mills, cement factories, etc.).

Above all, the excellent ability to withstand shock and vibration allow their use on rolling stock.

Safe and reliable operation is guaranteed by:

• Contact terminals without connecting braids and soldered joints. The terminals connecting with the socket are provided by a direct extension of the contacts.
• Mechanism without return springs.
• Adoption of all-metallic operating mechanism, unaffected by the thermal aging that typically degrades organic materials, such as plastics.
• Excellent shock and vibration resistance.
• Notable resistance to high operating temperatures and high thermal shocks.

The self-cleaning contacts are independent, being anchored neither one to another nor to a common operating mechanism. Positioned in separate chambers, they enable better breaking of the arc.

In addition, they are equipped with magnetic arc blowout, guaranteeing a particularly efficient break of direct current loads. The common contact is mounted to a separate return device, consisting in a flexible blade designed to ensure uniformity of the pressures on break contacts. Given their dimensions and specifications, POK relays provide the logical complement to power relays of the OK series.

The OK series is made up of seven basic models, created from a patented common operating mechanism equipped with four contacts. Solutions with eight or twelve contacts are obtainable by using two or three relays in combination.

The construction of the relays and careful choice of the materials are such that they ensure long life and considerable ruggedness even in harsh operating environments and when subject to strong thermal shocks. A specific treatment (P5GEO or P6GEO) combining coil tropicalization with gold-plated contacts allows the use of these items in geothermal electric power stations, as final relays for controlling field devices and for all power circuit.

The relays in the OK Series use a patented switching mechanism designed to minimize friction, resulting in a mechanical life expectancy of at least 100,000,000 operations.

This is made possible thanks to:

• The use of a solenoid with a core drawn in toward the main air gap, located at the center of the coil, the only position in which the available magnetic flux can be exploited to the full.
• The core motion being limited to the minimum, thereby optimizing mechanical forces and reducing friction. The motion is amplified by means of a W linkage, which allows an appreciable displacement of the contact (> 4 mm in the case of the version with NO contacts).
• The coil elongated cylindrical geometry, best able to ensure high efficiency and effective dissipation of the heat produced.

Each contact is mounted on individual and independent blades, which are able to provide optimum shock and vibration resistance.

In particular, this generates pressure of around 0.8...1 N on the make and break contacts, which is unparalleled by other products.

The common contact slides against the fixed poles (NO and NC contacts) both when opening and when closing, which ensures a notable effective self-cleaning action.

With ample clearance between the open contact elements, it becomes possible to guarantee an impulse withstand voltage of 5 kW between the poles of the single contact.

Excellent electrical and mechanical performance levels allow the product to be used in the most demanding of sectors such as, for example, control and signaling functions in electricity generating stations, electrical transformer stations, rail transport or in industries with continuous production processes (chemical industry, petroleum industry, rolling mills, cement factories, etc.).

Above all, the excellent ability to withstand shock and vibration allow their use in seismic environments or on rolling stock.

The relays in the F-OK Series are designed and manufactured with materials and solutions which make them particularly long-lasting and rugged. They are ideal for use in difficult operating environments, even in the event of significant thermal shocks. Thanks to their high resistance to shocks and vibrations, these relays are particularly suitable for use on rolling stock.

Because of the high electrical and mechanical performance provided by these relays, they can not only be used on rolling stock, but also in sectors such as control and signaling in railway transport or in applications with continuous production processes. Equipped with "double break" contacts, they are effective at breaking DC loads.

The relays in the RCG / RDG line are highly reliable products featuring high performance, suitable for applications in very harsh and disturbed environments. They are provided with forcibly guided (mechanically linked) contacts. The component conforms to the EN 61810-3 requirements, type A relay (all contacts are mechanically linked). Forcibly guided contacts are also know as weld-no-transfer contacts. A typical application is the check reading of a contact for determining, with absolute certainty, the state of the other contacts in self-monitoring control systems.

Thanks to the exceptional breaking capacity, the relay is suitable for controlling heavy duty loads with intensive switching frequency where safety and electrical continuity is an all-important factor.

The versatility in manufacture allows producing relays with various voltages.

The types of contacts allow obtaining remarkable performance levels both of high, inductive loads or very low loads; the optional presence of the magnetic arc blow-out contributes considerably to the breaking capacity. The knurled contacts ensure better self-cleaning characteristics and lower ohm resistance thanks to the various points of electrical connection, thereby improving the electrical life of the component.

In relays with forcibly guided (mechanically linked) or weld-no-transfer contacts, special design and constructional measures are used to ensure that make (normally-open) contacts can not assume the same state as break (normally-closed) contacts.

• If, when powering up a relay, a NC contact fails to open, the remaining NO contacts must not close, maintaining a contact gap ≥ 0.5 mm.
• When the relay is de-energized, if a NO contact fails to open, the remaining NC contact must not close, maintaining a contact gap ≥ 0.5 mm.

EN 61810-3 lays down the standard requirements for relays with forcibly guided contacts. This standard defines two types of relay with forcibly guided contacts, namely:

• Type A: Relay whose contacts are all mechanically linked (forcibly guided).
• Type B: Relay containing mechanically linked contacts and contacts which are not mechanically linked.

In the case of relays that include changeover contacts, either the make circuit or break circuit of a changeover contact can be considered to meet the requirements of this standard.

The relays in the RGG line are highly reliable products featuring high performance, suitable for applications in very harsh and disturbed environments. They are provided with forcibly guided (mechanically linked) contacts. The component conforms to the EN 61810-3 requirements, type A relay (all contacts are mechanically linked). Forcibly guided contacts are also known as weld-no-transfer contacts. A typical application is the check reading of a contact for determining, with absolute certainty, the state of the other contacts in self-monitoring control systems.

Thanks to the exceptional breaking capacity, the relay is suitable for controlling heavy duty loads with intensive switching frequency where safety and electrical continuity is an all-important factor.

The versatility in manufacture allows producing relays with any voltage in the range 12 to 230 VDC and with a great number of operating ranges adaptable to the various application requirements.

The types of contacts allow obtaining remarkable performance levels both of high, very inductive loads or very low loads; the optional presence of the magnetic arc blow-out contributes considerably to the breaking capacity. The knurled contacts ensure better self-cleaning characteristics and lower ohm resistance thanks to the various points of electrical connection, thereby improving the electrical life of the component.

In relays with forcibly guided (mechanically linked) or weld-no-transfer contacts, special design and constructional measures are used to ensure that make (normally-open) contacts can not assume the same state as break (normally-closed) contacts.

• If, when powering up a relay, a NC contact fails to open, the remaining NO contacts must not close, maintaining a contact gap ≥ 0.5 mm.
• When the relay is de-energized, if a NO contact fails to open, the remaining NC contact must not close, maintaining a contact gap ≥ 0.5 mm.

EN 61810-3 lays down the standard requirements for relays with forcibly guided contacts. This standard defines two types of relay with forcibly guided contacts, namely:

• Type A: Relay whose contacts are all mechanically linked (forcibly guided).
• Type B: Relay containing mechanically linked contacts and contacts which are not mechanically linked.

In the case of relays that include changeover contacts, either the make circuit or break circuit of a changeover contact can be considered to meet the requirements of this standard.

RMGX relays are highly reliable products offering top performance, suitable for applications in particularly harsh and unsettled environments. Meeting the requirements of standard EN 61810-3 type A; the relay is equipped with mechanically linked contacts (forcibly guided), an indispensable feature for applications where there is a need to guarantee that make (NO) contacts will never assume the same status as break (NC) contacts. Forcibly guided contacts are also known as weld-no-transfer contacts. With change-over contacts, customers have the greatest possible flexibility in selecting the configuration (6 NC + 2 NO, 5 NC + 3 NO, etc.) best suited to their particular needs.

Thanks to its exceptional breaking capacity, the relay is suitable for controlling heavy duty loads with intensive switching frequency, where safety and continuity of operation are all-important. Manual operation as standard for all models, allowing tests to be conducted in the absence of any power supply. The contacts used are of a type designed to give top performance both with high and strongly inductive DC loads, and with particularly low loads; inclusion of the magnetic arc blow-out function (optional) helps to achieve a considerable increase in breaking capacity.

Knurled contacts ensure not only better self-cleaning characteristics, but also lower ohmic resistance thanks to multiple points of electrical connection, thereby extending the electrical life expectancy of the component.

In relays with forcibly guided (mechanically linked) or weld-no-transfer contacts, special design and constructional measures are used to ensure that make (normally-open) contacts can not assume the same state as break (normally-closed) contacts.

• If, when powering up a relay, a NC contact fails to open, the remaining NO contacts must not close, maintaining a contact gap ≥ 0.5 mm.
• When the relay is de-energized, if a NO contact fails to open, the remaining NC contact must not close, maintaining a contact gap ≥ 0.5 mm.

EN 61810-3 lays down the standard requirements for relays with forcibly guided contacts. This standard defines two types of relay with forcibly guided contacts, namely:

• Type A: Relay whose contacts are all mechanically linked (forcibly guided).
• Type B: Relay containing mechanically linked contacts and contacts which are not mechanically linked.

In the case of relays that include changeover contacts, either the make circuit or break circuit of a changeover contact can be considered to meet the requirements of this standard.

The TMM series is a range of multifunction relays with electronic time delay, consisting of two models with four change-over contacts, rated 10 A (nominal). They are obtained by assembling the electromechanical units of the POKS series with a digital electronic circuit. The electromechanical part features the reliability and ruggedness of relays belonging to the POKS series, while the electronics offers high reliability thanks to the use of a circuit requiring few components and to the careful choice of professional products.

A single TMM series relay offers ten different timer functions, freely programmable by the user; these include, by way of example, time delay on pick-up or on drop-out, flasher, one-shot, etc.

The switching time can be selected within a wide range extending from 0.1 seconds to 99 hours, with extreme accuracy guaranteed across the full scale of adjustment. This is made possible by providing the relay with ten intermediate scales.

The timer function, the scale and the switching time are adjustable by means of four rotary switches, each having ten positions, located on the front of the relay.

The electronic circuit is immune to high electromagnetic interference, typical of high voltage electricity distribution stations. The construction of the relays and careful choice of the materials are such that they ensure long life and considerable ruggedness even in harsh operating environments and in the presence of strong temperature fluctuations.

Excellent electrical and mechanical performance levels allow the product to be used in the most demanding of sectors such as, for example, rail transport, control and signaling functions in electricity generating stations, electrical transformer stations, or in industries with continuous production processes (chemical and petroleum industries, rolling mills, cement factories, etc.). Above all, the excellent ability to withstand shock and vibration allow their use on rolling stock.

The TM series is a range of relays with electronic time delay on pick-up or drop-out, consisting of eight models with 4 change-over contacts, from 5 to 10 A (nominal). They are obtained by assembling the electromechanical units of the POK or BIPOK series with a digital electronic circuit. The electromechanical part features the reliability and ruggedness of relays belonging to the POK series, while the electronics offers high reliability thanks to the use of an electronic circuit requiring few components and to the careful choice of professional products.

With the same product it is possible to obtain switching times ranging from 0.1 second to over 9 hours, with the greatest of accuracy over the entire setting range. This is thanks to the fact that the relay has 16 intermediate scales, freely selectable by the user.

Switching time is adjustable by means of two DIP switches, 4- and 8-bit respectively, located on the front of the relay. The 4-bit DIP switch serves for selecting the most suitable intermediate scale, while the 8-bit DIP switch is used for precision selection of the switching time.

On request, the models are available with fixed switching time to avoid modifications to the time setting.

The electronic circuit is immune to high electromagnetic interference, typical of high voltage electricity distribution stations.

The construction of the relays and careful choice of the materials are such that they ensure long life and considerable ruggedness even in harsh operating environments and in the presence of strong temperature fluctuations.

Excellent electrical and mechanical performance levels allow the product to be used in the most demanding of sectors such as, for example, control and signaling functions in electricity generating stations, electrical transformer stations, rail transport or in industries with continuous production processes (chemical industry, petroleum industry, rolling mills, cement factories, etc.). A specific treatment (P5GEO or P6GEO) combining coil tropicalization with gold-plated contacts allows the use of these items in geothermal electric power stations, as relays for signaling functions, for controlling intermediate devices and for all non-power circuits.

Above all, the excellent ability to withstand shock and vibration allow their use on rolling stock.

The relays in the TOK series are monostable types with time delay, using four CO contacts. Manufactured following the same basic electromechanical design of the OK Series, they embody all the features and benefits of this product. These models are suitable for use in the most demanding of sectors such as, for example, electricity generating stations, electrical transformer stations, industries using continuous production processes, and railways — fixed equipment and rolling stock alike. An ample clearance between open contact elements is instrumental in ensuring optimum performance when breaking high loads. The use of a magnetic arc blow-out helps to achieve a considerable increase in breaking capacity, even when handling highly inductive loads.

TOK Series

The TOKe and TOKr relays provide time delays on pick-up and drop-out respectively, using four CO contacts. Intended originally for use in nuclear power plants, these relays are designed to guarantee particularly high reliability and superior strength. The time interval is adjusted by way of a potentiometer with a flat-head slotted screw, accessed from the top of the cover. A LED indicates energized status of the coil.