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FURNAS SIEMENS

Furnas Siemens represents the convergence of two historically significant names in industrial electrical control. Furnas Electric Company, founded in the early 20th century, built a reputation for rugged electromechanical controls used in HVACR and industrial machinery. Siemens acquired the Furnas business in the 1990s, integrating its product lines into the broader Siemens industrial control portfolio. Today, components carrying the Furnas Siemens designation are typically legacy or replacement parts that remain compatible with modern Siemens control systems, particularly in North American and global aftermarket applications. The product families most commonly associated with this brand include contactors, auxiliary switches, switching relays, overload relays, motor starters, and definite-purpose contactors. These devices are used to switch electrical loads, provide status feedback, and protect motors in commercial and industrial settings. Typical applications span HVACR equipment (compressors, fans, pumps), industrial control panels, conveyor systems, and process machinery. Technically, Furnas Siemens controls are built to standard industrial specifications: contactors are rated for AC-1, AC-3, and AC-4 duty, with current ratings from a few amperes up to several hundred amperes. Auxiliary switches offer additional normally open or normally closed contacts, often with snap-action mechanisms for reliable low-level switching. Switching relays are available in various coil voltages and contact configurations. Enclosures may carry NEMA 1, NEMA 12, or NEMA 4 ratings depending on the specific model. Many parts are UL recognized or listed, and some carry CSA certification. 3G Electric supplies Furnas Siemens replacement HVACR controls, switches, and thermostats as part of its global distribution of industrial equipment. The inventory includes auxiliary switches, contactors, and switching relays that serve as drop-in replacements for existing installations. Because these components are often used in maintenance and repair operations, 3G Electric focuses on providing accurate cross-reference data and technical specifications to help buyers match the correct part number. The product listings include manufacturer part numbers such as 3RH1921-1CA10, 3RT2027-1AK60, and 3TX7114-5LC13, which correspond to specific Siemens catalog items. This allows plant engineers and maintenance managers to verify compatibility with their existing control panels. 3G Electric does not manufacture these products; it distributes them as part of a broader portfolio that includes burners, pumps, gas controls, and other industrial equipment. The company serves customers worldwide, shipping from its Singapore headquarters to support maintenance, repair, and operations across various industries. For technical buyers, the key considerations when selecting Furnas Siemens controls include coil voltage, contact rating, mounting style, and terminal type. Auxiliary switches must match the contactor or relay they are mounted on, both mechanically and electrically. Contactors must be sized for the load, with attention to utilization category and expected switching frequency. Switching relays require correct coil voltage and contact configuration for the control circuit. 3G Electric provides access to datasheets and part number cross-references to assist with these selections. The Furnas Siemens line remains relevant for legacy systems where original components are still in service, as well as for new installations that specify Siemens control gear. By stocking these parts, 3G Electric helps reduce downtime by offering a source for replacement components that might otherwise be difficult to locate. The company's global reach means that customers in different regions can access the same parts, though lead times may vary based on location and inventory. Overall, Furnas Siemens products represent a blend of traditional electromechanical reliability and modern Siemens engineering, serving the ongoing needs of industrial and HVACR maintenance.

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About FURNAS SIEMENS

Furnas Siemens represents the convergence of two historically significant names in industrial electrical control. Furnas Electric Company, founded in the early 20th century, built a reputation for rugged electromechanical controls used in HVACR and industrial machinery. Siemens acquired the Furnas business in the 1990s, integrating its product lines into the broader Siemens industrial control portfolio. Today, components carrying the Furnas Siemens designation are typically legacy or replacement parts that remain compatible with modern Siemens control systems, particularly in North American and global aftermarket applications. The product families most commonly associated with this brand include contactors, auxiliary switches, switching relays, overload relays, motor starters, and definite-purpose contactors. These devices are used to switch electrical loads, provide status feedback, and protect motors in commercial and industrial settings. Typical applications span HVACR equipment (compressors, fans, pumps), industrial control panels, conveyor systems, and process machinery. Technically, Furnas Siemens controls are built to standard industrial specifications: contactors are rated for AC-1, AC-3, and AC-4 duty, with current ratings from a few amperes up to several hundred amperes. Auxiliary switches offer additional normally open or normally closed contacts, often with snap-action mechanisms for reliable low-level switching. Switching relays are available in various coil voltages and contact configurations. Enclosures may carry NEMA 1, NEMA 12, or NEMA 4 ratings depending on the specific model. Many parts are UL recognized or listed, and some carry CSA certification. 3G Electric supplies Furnas Siemens replacement HVACR controls, switches, and thermostats as part of its global distribution of industrial equipment. The inventory includes auxiliary switches, contactors, and switching relays that serve as drop-in replacements for existing installations. Because these components are often used in maintenance and repair operations, 3G Electric focuses on providing accurate cross-reference data and technical specifications to help buyers match the correct part number. The product listings include manufacturer part numbers such as 3RH1921-1CA10, 3RT2027-1AK60, and 3TX7114-5LC13, which correspond to specific Siemens catalog items. This allows plant engineers and maintenance managers to verify compatibility with their existing control panels. 3G Electric does not manufacture these products; it distributes them as part of a broader portfolio that includes burners, pumps, gas controls, and other industrial equipment. The company serves customers worldwide, shipping from its Singapore headquarters to support maintenance, repair, and operations across various industries. For technical buyers, the key considerations when selecting Furnas Siemens controls include coil voltage, contact rating, mounting style, and terminal type. Auxiliary switches must match the contactor or relay they are mounted on, both mechanically and electrically. Contactors must be sized for the load, with attention to utilization category and expected switching frequency. Switching relays require correct coil voltage and contact configuration for the control circuit. 3G Electric provides access to datasheets and part number cross-references to assist with these selections. The Furnas Siemens line remains relevant for legacy systems where original components are still in service, as well as for new installations that specify Siemens control gear. By stocking these parts, 3G Electric helps reduce downtime by offering a source for replacement components that might otherwise be difficult to locate. The company's global reach means that customers in different regions can access the same parts, though lead times may vary based on location and inventory. Overall, Furnas Siemens products represent a blend of traditional electromechanical reliability and modern Siemens engineering, serving the ongoing needs of industrial and HVACR maintenance.

Common Applications

  • HVACR — 3RT2027-1AK60 contactor for switching compressors and condenser fans in commercial rooftop units
  • Industrial control panels — 3RH1921-1CA10 auxiliary switch for status feedback on motor starters
  • Pump stations — 3TX7114-5LC13 switching relay for controlling pump motors in water treatment systems
  • Conveyor systems — Furnas Siemens contactors for starting and stopping conveyor drive motors
  • Process machinery — auxiliary switches for interlocking safety gates and signaling PLC inputs
  • Refrigeration — switching relays for defrost cycles and evaporator fan control

Guides & Resources

Frequently asked questions

Common questions about FURNAS SIEMENS from 3G Electric.

What is the difference between a Furnas Siemens contactor and an auxiliary switch?

A contactor is a main power-switching device designed to handle high currents for loads such as motors, compressors, or heaters. An auxiliary switch, like the 3RH1921-1CA10, is a smaller add-on component that provides additional low-power contacts for signaling or interlocking. Auxiliary switches mount directly onto contactors or relays and are used to indicate the main device's position or to control other circuits. They are not intended to switch main power loads. When selecting, match the auxiliary switch to the specific contactor model to ensure mechanical and electrical compatibility.

How do I choose the right Furnas Siemens switching relay for my HVACR system?

Selecting a switching relay such as the 3TX7114-5LC13 requires knowing the coil voltage available in your control circuit, the number and type of contacts needed (normally open or normally closed), and the load current of the devices being controlled. Verify the relay's contact rating meets or exceeds the load requirements. Also consider the mounting style and terminal type to ensure it fits your panel. For replacement, cross-reference the existing relay's part number and specifications. If unsure, consult the equipment manual or a qualified electrician.

Are Furnas Siemens contactors compatible with modern Siemens control systems?

Many Furnas Siemens contactors, such as the 3RT2027-1AK60, are part of the Siemens 3RT series and are designed to be compatible with current Siemens control components. However, compatibility depends on the specific model and application. Always verify coil voltage, contact configuration, and mounting dimensions against your system requirements. For legacy Furnas products, cross-reference guides may be needed. 3G Electric provides part numbers and specifications to assist with matching, but final verification should be done by a qualified engineer.

What are the typical applications for Furnas Siemens auxiliary switches?

Furnas Siemens auxiliary switches are used in industrial control panels to provide additional signaling contacts for contactors and relays. Common applications include remote status indication, interlocking between devices, and control circuit logic. For example, an auxiliary switch can signal a PLC that a motor starter is engaged, or prevent a pump from starting unless a valve is open. They are also used in HVACR equipment to sequence fans and compressors. The 3RH1921-1CA10 is a typical model, offering reliable low-power switching for these purposes.

How does 3G Electric support Furnas Siemens replacement parts?

3G Electric distributes Furnas Siemens replacement HVACR controls, switches, and thermostats globally. The company provides detailed product listings with manufacturer part numbers, specifications, and cross-reference information to help buyers identify the correct replacement. While 3G Electric does not manufacture these parts, it maintains inventory and can source components as needed. Technical support is available to assist with part selection, but final compatibility should be confirmed by the customer. Shipping is available worldwide from Singapore.

Does 3G Electric supply FURNAS SIEMENS products?

Yes — 3G Electric (S) Pte. Ltd. supplies FURNAS SIEMENS products. We stock the FURNAS SIEMENS catalog and supply genuine factory-original products with full manufacturer warranty and technical support.