Power Resistor MAL - wirewound

Wirewound power resistor in aluminium housing for continuous high power

The MAL power resistors are designed for applications where continuous high power and a wide resistance range are required. The wirewound resistor is built on a ceramic substrate and integrated into a robust aluminium housing, which provides mechanical protection and high durability. Depending on the type, graded power ratings of 5 W, 10 W, 25 W and 50 W are available, allowing the appropriate resistor to be selected for different power requirements.

The resistance range from 0.01 Ω to 250 kΩ and resistance tolerances from ±0.01% to ±10% cover a very wide range of tasks – from low-ohmic shunt and load resistors up to precise resistors in the higher kΩ range. A typical temperature coefficient of ±20 ppm/°C ensures low temperature drift, which is beneficial for current measurement, reference branches or stable load conditions. The operating temperature range from −55 °C to +275 °C allows use in thermally demanding environments, for example in power, converter and drive electronics.

Optional low-inductance windings reduce parasitic inductance and enable use in fast switching power stages or measurement paths with higher bandwidth. Another option is the 4-wire (Kelvin) connection, which allows precise current and voltage measurement directly at the resistor, without the influence of lead and track resistance. This makes the MAL series particularly suitable as a shunt resistor for current measurement, as a braking and load resistor, or as a precision power resistor in power supplies, converters and motor drives.

Options

• Types: MAL5 / MAL10 / MAL25 / MAL50 with graded power ratings and permissible resistance ranges
• Resistance range: 0.01 Ω–250 kΩ, with type-specific min./max. values (e.g. MAL5 up to 22 kΩ, MAL50 up to 250 kΩ)
• Resistance tolerances: ±0.01%, ±0.02%, ±0.05%, ±0.1%, ±0.25%, ±0.5%, ±1%, ±2%, ±5%, ±10%
• Temperature coefficient: typ. ±20 ppm/°C, further TCR variants available on request
• Low-inductance winding to reduce parasitic inductance (option)
• 4-wire Kelvin connection for precise current measurement and reference applications (option)
• Various connection styles (e.g. solder lugs) for application-specific designs