Danotherm

Design and Manufacture of Quality Power Resistors

With roots dating back to 1919, the Danish company Danotherm Electric A/S is known worldwide for high-quality design and manufacture of A-quality power resistors. Danotherm’s high-power resistors are engineered to optimize efficiency and ensure reliability, enhancing operational performance across demanding applications. The portfolio supports a wide range of markets: e-mobility, industrial automation, marine, and renewable energy, with typical uses including snubber resistors for semiconductors, voltage dividers, and load/discharge resistors. In wind turbines, Danotherm solutions also serve as filter and high-energy dump resistors for Low Voltage Ride Through (LVRT) applications.

Danotherm is a member of the Swedish NIBE Industrier AB — NIBE Group. The main factory is located in Copenhagen, Denmark, with additional production in Stargard, Poland, and two facilities near Milan and Turin, Italy.

We Supply Danotherm High-Power Resistors

• Liquid-cooled resistors: for very high continuous power and compact footprints (e.g., cooling with water/ionized water; glycol options for extended temperature range).
• Air-cooled resistors: available in both forced-air and natural-convection versions.
• Brake resistors: designed for sustained braking energy in electric transport, marine drives, and heavy industrial duty.
• Filter resistors: for harmonic filtering in converters and grid interfaces.
• High-energy dump / discharge resistors: for safe energy dissipation during faults or emergency stops.
• Snubber resistors: to protect power semiconductors in high-dv/dt environments.
• Neutral Earthing Resistors (NER): for MV/HV grids to limit fault currents and improve protection selectivity.

Excelling at Customer-Specific Solutions

Our products are built for the most demanding environments and cover numerous industry-specific requirements. We focus on delivering reliable, cost-effective, and optimized power resistor solutions for any need, whether it is a catalog product adapted to precise specifications or a completely new design. Together, Astrolkwx and Danotherm specialize in customizing power resistors, mechanically and electrically, to fit your application (including housing materials such as aluminum or stainless steel, IP ratings, thermal sensors, and interface options).

Schedule a Technical Online Meeting with Peter

We offer a technical online meeting to learn about your application and objectives. If you have DC-related questions, need help with power-electronics projects, or require support with complex thermal or protection challenges, this session with one of our power electronics consultants will be valuable. Schedule your preferred time slot below to discuss which high-power resistor best fits your performance, safety, and lifecycle targets.