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BACKER CYNEBAR OHMIC
Unit 11-12/6, Whitelaw Pla
Richlands QLD 4077, Australia

 

T: +61 (07) 3252 4257
E: sales@backercynebarohmic.com.au
W: www.backercynebarohmic.com.au, au.backer-asia.com
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Danotherm Steel Tube Resistors: High-Density Power for Harsh Industrial Duty

When systems require maximum power in a minimal footprint, Danotherm’s steel tube resistors deliver the most streamlined and rugged solution. Purpose-built for harsh industrial environments where uncompromising reliability and thermal stability are paramount, these convection-cooled units are engineered for demanding loads, including overload conditions of up to ten times rated power for short intervals.

The core of the design lies in multiple welded stainless steel tubes (available in AISI 304 or optionally AISI 316). Each tube is internally packed with high-performance magnesium oxide insulation and an embedded alloy wire element. This structure achieves dependable, high-density power dissipation in a compact frame, offering a highly reliable thermal path from the tube to the ambient air via natural convection.

The metal-tube construction makes them the definitive choice for environments plagued by vibration, high humidity, and corrosives, such such as lifting gear, cranes, winches, and critical marine and harbor installations. Engineers appreciate the robust materials, IP65/IP66 protection classes, and crucial optional features such as hot-surface guards and moisture-resistant enclosures.

These design choices ensure the units integrate seamlessly into dynamic braking systems, load banks, and fault-current or neutral-earthing applications, maintaining predictable thermal behavior under heavy operational cycling.

With its no-nonsense build, strong performance envelope, and clear mounting options, Danotherm’s steel tube resistors provide engineers with a dependable building block for critical power dissipation challenges. For systems in automation, material handling, marine deck machinery, or industrial drives, these units deliver true "fit-and-forget" reliability without sacrificing essential design flexibility.
Steel Tube GxxRT
Steel Tube GxxRT
Steel Tube PCG
Steel Tube PCG

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Danotherm Liquid-Cooled Resistors: Maximized Power Density with Precision Thermal Control

When your system demands extreme energy dissipation and precise thermal management in a minimal footprint, Danotherm’s liquid-cooled resistors are the definitive solution. Engineered for high-energy applications where traditional air cooling is insufficient, these systems utilize water or de-ionised water (with optional glycol) as the primary cooling medium—reliably unlocking colossal power ratings spanning from 6 kW up to 1,450 kW.

At the core is a fully welded steel or aluminum housing (available in grades AISI 304 or AISI 316) that encapsulates a resistive element array—typically steel tubes or nickel-chrome spirals—submerged in circulating coolant. This sealed, tank-style construction is the key to achieving superior heat transfer, exceptional overload capability, and a significantly more compact footprint relative to any equivalent air-cooled unit. This stability is critical, ensuring stable thermal behaviour and long duty cycles across repeated fault events or pulse loads.

These resistors are indispensable for demanding use-cases, including dynamic braking, high-voltage filter circuits, and critical energy dump banks. They are particularly robust in challenging environments like marine, offshore platforms, or heavy industrial settings where ambient conditions or high vibration levels are present.

Installation is designed for maximum system integration. The robust housings support flexible horizontal or optional vertical mounting, with standard IP ratings up to IP65/IP66 depending on the configuration. To ensure seamless operation, options include integrated sensors (pressure, temperature), as well as specialized surface finishes or enclosures tailored for corrosive or marine-grade environments. By carefully specifying body materials and coolant options, Danotherm enables engineers to perfectly right-size the resistor for any continuous or peak demand.

For system designers in power generation, traction, renewables, or heavy industrial drives—where space is limited but uncompromising robustness is non-negotiable—Danotherm’s liquid-cooled resistors offer the proven path to the most efficient and reliable energy control available.
Liquid cooled WHHB5502
Liquid cooled WHHB5502
Liquid cooled WHHB5502
Liquid cooled WHHB5502
Liquid cooled WHHB5502
Liquid cooled WHHB5502

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Danotherm PR-Series Resistors: Precision, Ultra-Low Inductance for High-Frequency Power Electronics

The Danotherm PR-series resistors are the premier choice for applications where minimal parasitic inductance, a tight footprint, and dependable thermal performance are critical.5 These advanced thick-film, heatsink-cooled units are purpose-built to excel in high-frequency power electronics, specifically in filter, snubber, and moderate-power tasks within demanding electrical assemblies.

At the core of the design are robust aluminium-oxide ceramic substrates onto which the low-inductance, conductive paste is precisely printed.7 The resistive elements are tin-welded to copper terminals and enclosed in a protective, UL94V-0-rated housing.8 Power ratings range from approximately 9$100\ \text{W}$ up to 10$800\ \text{W}$ (depending on base temperature and heatsink configuration).11 Working voltages are equally impressive, reaching up to $1500\ \text{VAC}$ for the smaller variants and up to $5\ \text{kVAC}$ for PR250/PR600/PR800 designs.

Because these power modules rely entirely on a customer-supplied heatsink, the integrity of the thermal interface is paramount: thermal grease or conductive foil between the resistor and the heatsink is mandatory to unlock full power ratings and guarantee stability.

Engineers rely on these resistors for their measured electrical precision: low self-inductance ($\text{typically}\ \approx 40-80\ \text{nH}$) and low parasitic capacitance to the heatsink ($< 150\ \text{pF}$) make them perfectly suited for fast-switching snubber networks, EMI filters, and high-voltage charge/discharge circuits.

With compact housings, high dielectric strength, metallic base-plate mounting, and flexible tolerance options (standard $\pm 10\ \%$, optional $\pm 1\ \%$), the PR-series provides exceptional design freedom across automation, traction, power electronics, and industrial filter systems.
PR Series
PR Series

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Danotherm RB-Series Resistors: Compact, Pulse-Resilient Performance for Heavy-Duty Control

Danotherm’s RB-series resistors are purpose-engineered for critical scenarios where a compact form factor, reliable performance, and exceptional pulse resilience are essential design criteria. These heatsink-cooled, wire-wound units feature a robust extruded aluminium housing with deep cooling fins and a protective, gold-anodised finish. This highly optimized design ensures maximum corrosion resistance and superior heat dissipation for both high continuous loads and repeated pulse stress.

The core element is built around a ceramic or steatite core with a copper-nickel or nickel-chrome alloy winding, guaranteeing excellent thermal conduction and uniform heat transfer. When mounted on a proper heatsink, units deliver nominal powers ranging from $12\ \text{W}$ up to $250\ \text{W}$, with working voltages spanning from $265\ \text{VAC}$ to as high as $2,300\ \text{VAC}$ depending on the model.

A critical advantage is the RB series’ unmatched overload capability: properly heatsinked resistors can safely sustain up to five times the nominal power for short periods (e.g., 5 seconds). This makes the series the ideal, trusted choice for demanding high-pulse, fault-current applications, and general use in control panels, test equipment, power electronics, and industrial environments requiring high reliability under combined thermal and electrical stress.

Full power ratings require proper heatsink mounting, leveraging natural or forced convection across the aluminium cooling fins. While nominally rated at IP00 (for internal cabinet mounting), the robust anodised finish provides crucial protection in humid, dusty, or mildly corrosive conditions.

For engineers specifying resistors for heavy-duty control cabinets or high-pulse repetitive applications, Danotherm’s RB-series delivers a compact, reliable solution with proven pulse resilience, excellent heat dissipation, and straightforward integration into any power system.
RB1
RB1
RB2
RB2