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Bimetal Siemens: An Overview of Uses, Advantages, and Applications

Bimetal Siemens is an electrical device composed of two layers of metal with different properties. These layers primarily consist of copper and steel or aluminum and steel. In this structure, each metal layer has distinct properties such as electrical resistance, thermal conductivity, and hardness.

It is a Siemens product designed as a suitable alternative for traditional power cables. Bimetal Siemens is made up of two metal layers, each made of steel and aluminum. These two layers are welded together to create the Bimetal Siemens.

Below, a more in-depth introduction and examination of Bimetal Siemens is provided:

Advantages of Using Bimetal Siemens:

Lighter weight compared to traditional power cables.
Greater flexibility and no need for large installation space.
High resistance to moisture and oxidation.
No need for subsequent replacement due to permanent stability.

Applications of Bimetal Siemens:

Bimetal Siemens finds applications in various industries such as construction, automotive, electrical, and oil and gas industries, serving as a replacement for traditional power cables. It is also recommended for electrical system connections.

Difference Between Bimetal Siemens and Traditional Power Cables:

One of the main advantages of Bimetal Siemens is its lighter weight and increased flexibility compared to traditional power cables. The product is made of an alloy with different sizes between two layers, providing higher resistance to corrosion, water, harsh weather conditions, and more. Additionally, this product reduces maintenance and repair costs, resulting in a longer lifespan compared to traditional accessories.

Bimetal Siemens also has a unique design that enhances its efficiency compared to traditional accessories. In this product, the aluminum layer is combined with the copper layer as a single unit. It also features a special coating technology that allows the product to heat up quickly, preventing contamination at the installation site.

Another advantage of Bimetal Siemens is the possibility of reducing installation and maintenance costs. Due to its special design, the installation is straightforward and does not require specific technical expertise. Moreover, its high resistance to corrosion and other factors leads to reduced maintenance and repair costs.

In conclusion, Bimetal Siemens, with its high efficiency, corrosion resistance, unique design, and easy installation, proves to be the best choice for many industrial applications such as petrochemical production, industrial furnaces, and other industrial equipment. Additionally, the product has gained a good position in the global market due to its compliance with international standards and necessary licenses for use in various industries.

Types of Siemens Bimetal

In recent decades, advancements in technology, especially in the industrial sectors such as electrical and electronics industries, have led to the emergence and utilization of more advanced and efficient equipment. In this regard, various series of Siemens Bimetal have gained attention as prominent examples of these crucial devices. As a leading company in the production of electrical and electronic equipment, Siemens, with a focus on providing innovative and efficient solutions for energy and electronics, is recognized globally under reputable names.

Different series of Siemens Bimetal exhibit a wide range of diversity and versatility, finding applications in many industrial fields, including energy transmission and distribution, petrochemical industries, steel and mining industries, industrial automation, and more. These series, tailored to various industrial needs, possess unique features and capabilities that enhance productivity and efficiency in various production processes.

This article delves into the examination and introduction of Siemens Bimetal series, emphasizing their features and applications. Additionally, it discusses the role of these devices in industrial developments and the advancement of technology in the fields of electronics and energy.

Siemens Bimetal Series 3UA

Overload Relay 3UA: 3UA5/6 overload relays are adjustable dual-pole relays without metal suitable primarily for use in normal starting applications. They provide precise and reliable protection for motors against overload, considering Class 10A. They also offer protection against single-phase and asynchronous voltages.

Siemens Bimetal Series 3UC

Overload Relay 3UC: 3UC5/6 overload relays are adjustable dual-pole relays with saturation-wire wound (CT) primarily suitable for heavy-duty starting applications. In other words, they are designed for larger starting times when heavy objects need to be set in motion. They provide precise and reliable protection for motors against overload, considering Class 30. They also offer protection against single-phase and asynchronous voltages.

If single-phase AC or DC loads need protection through thermal overload relays 3UA/3UC, all three non-metallic strips must be heated. For this purpose, all main current paths of the relay must be connected in series.

These non-metallic relay strips comply with IS/IEC 60947-4-1 standards. They also carry the CE mark.

Range:

3UA5: 0.1 to 120 amperes (Class 10A, without CT)
3UA6: 85 to 630 amperes (Class 10A, with saturation-wire wound CT)
3UC5/6: 2.4 to 400 amperes (Class 30, with saturation-wire wound CT)

Relay Operation:

The overload relay operates on the principle of bimetallic strips. The aluminum heater carries the current passing through the non-metallic screws, which pass through the motor. In the case of overload, the carried current through the heater exceeds the rated current. This causes the non-metallic strips to heat up. Due to this, the non-metallic strips bend, opening the NC contact of the relay. This contact is connected to the control circuit contactor, thus disconnecting the motor from the power supply. The trip time is inversely proportional to the rated current. Therefore, non-metallic relays are known as “current-dependent,” and their time delay is inversely proportional.

Connection for Installation on Contactors:

These connection pins have been optimally adapted to contactors in terms of electrical, mechanical, and design aspects. These pins assist in the direct installation of overload relays. Alternatively, standalone installation is also possible (in some cases with an independent installation module).

Selection Switch for Manual/Automatic Reset (Blue):

With this switch, you can choose between manual and automatic reset modes. A device set to manual reset mode can be locally reset by pressing the reset button. Remote reset is also possible using reset modules (accessories) that are independent in size.

Test Button (Red):

The red test button allows manual checking of the trip circuit. In this simulation, the normally closed (NC) contact (95-96) opens, and the normally open (NO) contact (97-98) closes. This test ensures that the auxiliary circuit is correctly connected to the overload relay. If the overload relay is set to manual reset mode, it must be reset using the reset button. If the overload relay is set to automatic reset mode, it will automatically reset when the test button is released.

Motor Current Setting Slot:

Setting the device to the rated motor current is straightforward with a large rotating handle. (The internal dial slot prevents random changes in current settings.)

Trip Indicator (Green):

A separate mechanical green trip indicator is located on the front cover of the relay to display the tripped status when manually resetting the relay.

Siemens Bi-Metal Series 3RU1:

The 3RU11 thermal overload relays, with a capacity of up to 100 amperes, are designed for delayed protection against overloads with inverse time characteristics due to temperature rise caused by heavy loads or phase errors during normal start-up. An increase in motor current beyond the specified motor current results in overload or phase error. This current increase, using thermal elements, heats the bimetal strips inside the device, causing them to bend. Through a tripping mechanism, secondary hazards are activated. The secondary hazards then turn off the load via a contactor contact. The tripping time depends on the ratio between the tripping current and the specified current Ie and is stored as a stable long-term tripping feature.

The “Tripped” status is indicated by a switch position indicator. Reset can be done manually or automatically after the recovery time has elapsed. These devices are produced according to environmental guidelines, containing recyclable and environmentally friendly materials. They comply with all relevant global standards and agreements.

“Increased Safety” Protection Type EEx e according to ATEX Directive 94/9/EC:

The 3RU11 thermal overload relays are suitable for protecting explosion-proof motors with the “Increased Safety” protection type EEx e. These relays comply with the requirements of standard EN 60079-7 (Electrical equipment for explosive atmospheres – Increased Safety “e”).

Application:

The 3RU11 thermal overload relays are suitable for customers in all industries who want to ensure optimal delayed reverse protection of their electrical loads (such as motors) under normal start-up conditions (CLASS 10).

Environmental Conditions:

These relays have a temperature compensation according to IEC 60947-4-1 for the temperature range of -20 °C to +60 °C. For temperatures from +60 °C to +80 °C, the adjustment value above the adjustment range must be reduced by a specified factor, as indicated in the reduction table.

Siemens Bi-Metal Series 3RU2:

The 3RU21 thermal overload relays, with a capacity of up to 40 amperes, are designed for delayed reverse protection against overloads with inverse time characteristics due to temperature rise resulting from increased current or phase failure.

Application:

The 3RU21 thermal overload relays are designed for the protection of AC and DC three-phase and single-phase motors. If the 3RU21 thermal overload relays are to be used for the protection of single-phase AC loads or DC loads, all three bimetal strips must be heated. For this purpose, all main current paths of the relay must be connected in series.

Environmental Conditions:

The 3RU21 thermal overload relays have a temperature compensation according to IEC 60947-4-1 for the temperature range of -20 °C to +60 °C. For temperatures from +60 °C to +80 °C, the adjustment value above the adjustment range must be reduced by a specified factor, as indicated in the reduction table.

Siemens Bi-Metal Series 3RB2:

The 3RB20/3RB21 solid-state overload protection relays are suitable for customers in all industries who want to ensure optimal delayed reverse protection of their electrical loads (such as motors) under normal and heavy start-up conditions (from CLASS 5 to CLASS 30). They aim to minimize project completion time, inventory, and energy consumption, optimizing availability and maintenance management.

These devices are sensitive to external factors such as shocks, corrosive environments, aging, and temperature fluctuations.

For the temperature range of -25 degrees Celsius to +60 degrees Celsius, the 3RB20/3RB21 solid-state overload protection relays compensate for temperature according to IEC 60947-4-1.

For 3RB20/3RB21 solid-state overload protection relays with dimensions S6, S10, and S12, the adjustment value above the adjustment range must be reduced by a specific factor for ambient temperatures higher than 50 degrees Celsius.

Accessories: The following optional accessories are available for the 3RB20/3RB21 solid-state overload protection relays:

One side mount for each of the S00 and S0 dimension relays (S2 to S12 dimensions can be installed independently without a side mount).
A remotely adjustable module for all dimensions.
A cable release handle for resetting devices that are difficult to access (for all dimensions).
A lockable cover for all dimensions.
Terminal covers for dimensions S2 to S10/S12.
Terminal box blocks for dimensions S6 and S10/S12.

Siemens Bi-Metal Series 3RB3:

The 3RB30 and 3RB31 current-increase protection relays, with a capacity of up to 40 amperes and internal power supply, are designed for delayed reverse protection against overloads with normal and heavy start-up against temperature rise due to increased current, phase imbalance, or phase failure. An increase in current, phase imbalance, or phase failure results in an increase in motor current beyond the set consumption current. This current increase is detected by current transformers inside the devices and evaluated by proportional solid-state circuits, which then send a pulse to the secondary hazards. The secondary hazards then turn off the load via a contactor contact. The tripping time depends on the ratio between the tripping current and the set current (Ie) and is stored as a stable long-term tripping feature.

In addition to delayed reverse protection against temperature rise due to increased current, phase imbalance, and phase failure, the 3RB31 current-increase protection relays also provide the capability to detect internal ground faults (which is not possible when accompanied by a contactor set for Wye-Delta start-up). This protection is against short circuits with high resistance due to insulation material failure, humidity, condensed water, etc.

The “Tripped” status is indicated by a switch position indicator. Reset can be done manually or automatically after the recovery time has elapsed.

These devices have acted on environmental information and incorporated recyclable and reusable materials. They comply with all relevant global standards and certifications.

Overview of Siemens and its Role in the Power Industry:

Siemens, established in Germany since 1847, is one of the world’s largest companies in the production of electrical products. It has played a significant role in advancing the global power industry by producing advanced and quality products in various fields, including industrial automation, power systems, medical equipment, and communication technology.

One of Siemens’ important products is air circuit breakers, which many industries use to control and manage large sets of machinery. Siemens air circuit breakers are made up of components such as magnets, contactors, and electronic parts that, using air, can easily and quickly transfer control signals to machinery.

As the main supplier of Siemens products in Iran, Electro Shargh provides services to its customers, including the sale and support of Siemens products, including Siemens PLCs and Siemens air circuit breakers. With an experienced and specialized technical team, this company assists its customers in the design, installation, commissioning, and support of Siemens equipment.

Ultimately, for a company to compete in the power industry, it must have the ability to design and produce high-quality products using advanced technologies. Siemens, with over 160 years of experience in producing electrical equipment, is recognized as one of the largest industrial companies globally, known for producing high-quality products using cutting-edge technologies.

The Role of Bimetal in Electrical Panels:

In electrical panels, bimetal is mainly used for manufacturing components of push buttons and changeover parts. Siemens air circuit breakers are made of bimetal and are produced in two types: push buttons and mushroom buttons. The electrical conductivity of bimetal allows easy flow of electrical current in these components, enabling the air circuit breaker to control devices and machinery without the need for electricity. Additionally, the unique property of bimetal is utilized as a temperature sensor in the electrical panel section. Changes in temperature cause a deviation in the position of the metal, leading to alterations in electrical and control circuits.

Bimetal Components:

Bimetal is an alloy composed of two different metals, typically steel and copper. This alloy is used in the production of electrical panels and other electrical components due to properties such as high corrosion resistance, high wear resistance, high efficiency, and specific design features.

Generally, bimetal consists of two different metal layers that are pressed together during production. The main components of bimetal include:

Bottom Metal:
This layer of bimetal is usually made of steel and, in some cases, other metals such as aluminum. The bottom metal is typically used as the base for the bimetal structure and contributes to the stability of the bimetal.
Top Metal:
This layer of bimetal is usually made of copper. The top metal serves as the active layer in bimetal and is primarily responsible for changing shape with temperature variations, as well as conducting heat and electricity.
Outer Layer:
This layer is usually made of galvanized or aluminum coating and is used to protect the bimetal from corrosion and other external factors.

Bimetal is used in the production of electrical panels due to its mentioned properties. For example, in distribution panels, bimetal is used as a load-bearing and compressive element between cables and panel components. These characteristics make bimetal a suitable alternative for manufacturing electrical panels. Additionally, due to its high resistance to corrosion and other factors, bimetal can be permanently installed in both dry and humid environments, resulting in a long lifespan. Therefore, electrical panels with bimetal components are highly suitable for industrial, agricultural, and construction environments.

Best Bimetal Brands and the Best Source for Purchasing Various Bimetals:

Bimetal, as one of the most important materials used in the electrical industry, plays a crucial role in the production of various electrical equipment. Currently, many companies worldwide are engaged in bimetal production, but each brand of bimetal has different features and qualities. Prominent brands such as Albatherm, Nilo, Euro, and Ulbrich are recognized as the best bimetal brands in the market, known for their quality and high performance.

In Iran, Electro Shargh is acknowledged as one of the most reputable suppliers of various bimetals. This company provides high-quality bimetals to its customers, offering products with quality and high efficiency to the market. Additionally, with experienced and professional experts, Electro Shargh provides customers with necessary information for selecting the best type of bimetal and offers the ability to purchase the best bimetal with the best prices. For this reason, Electro Shargh is recognized as the best source for purchasing various bimetals in Iran.

Frequently Asked Questions:

1: What is Siemens Bimetal?

Siemens Bimetal is one of the prominent manufacturers in the field of electrical equipment. They produce equipment such as thermal relays, electronic relays, and protective devices used in various industries, including the electrical industry, oil and gas industry, and construction industry.

2: Why should we purchase Siemens Bimetal?

Siemens Bimetal, as a reputable and experienced brand in the field of electrical equipment, guarantees high efficiency and safety. Siemens products, utilizing advanced technology and international standards, offer high reliability and satisfactory performance.

3: How can I purchase Siemens Bimetal?

The best way to purchase Siemens Bimetal is to directly contact official Siemens representatives. By visiting authorized Siemens representatives in your city, you can obtain necessary information about products, prices, and after-sales services.

4: Does Siemens Bimetal provide after-sales services?

Yes, Siemens Bimetal has a strong support system and provides suitable after-sales services. They offer services such as installation, commissioning, repairs, and replacement of parts to ensure that electrical systems function properly.

5: Does Siemens Bimetal have competitive prices?

The prices of Siemens Bimetal products depend on the type and features of the product. However, Siemens, as a leading brand in the electrical equipment market, focuses on the quality and performance of its products. Therefore, the purchase cost may be relatively higher than other brands, but it compensates for it with its high value and quality.

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