ULM series

Introducing the ULM resistors, an exceptional solution meticulously designed for industrial applications with the added assurance of UL approval. Crafted with precision, the ULM series features metal-clad resistors housed in durable aluminum, engineered for efficient chassis mounting, and offering versatile power ratings from 330W to 750W in free air and 600W to 1200W when heat sink mounted.

Engineers benefit from a broad resistance range, spanning from 0.1 to 160Ω (inductive) and 0.1 to 48Ω (non-inductive). Tolerance options of ±1, ±2, ±5, and ±10 percent provide a customized solution for diverse applications. The maximum temperature coefficient of resistance (TCR) is capped at 260 ppm/°C, ensuring stability across a wide temperature range from -55℃ to +200℃.

The ULM resistors excel in braking and snubber applications, motor drives, and power sources for industrial equipment, showcasing unparalleled adaptability in diverse engineering scenarios. The added distinction of UL approval establishes the ULM series as a top-tier choice for engineers prioritizing compliance with the highest safety standards in their industrial projects.

For engineers considering a non-UL-approved alternative, the IRM series stands as a robust choice. Housed in durable aluminum and engineered for efficient chassis mounting, the IRM series offers similar power ratings and resistance options, making it a reliable solution for various industrial applications.

  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.1Ω up to 94Ω
  • Power rating of up to 600W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.1Ω up to 112Ω
  • Power rating of up to 800W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.1Ω up to 140Ω
  • Power rating of up to 1000W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.1Ω up to 175Ω
  • Power rating of up to 1200W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.3Ω up to 88Ω
  • Power rating of up to 570W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.45Ω up to 133Ω
  • Power rating of up to 650W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.6Ω up to 144Ω
  • Power rating of up to 720W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
  • RARA
  • Metal clad wire wound resistor
  • Resistance options from 0.7Ω up to 135Ω
  • Power rating of up to 750W (on heatsink)
  • Tolerance options between ±1% and ±10.0%
  • TCR of +260 ppm/°C maximum
  • For Non UL Approval see the IRM
Please be advised that due to the ongoing supply issues with raw materials affecting the global electronics industry, as well as an increase in orders received by our manufacturing partners, a large number of products are facing increased lead times in recent months. For the latest lead time and stock availability, please contact one of our engineers who will be happy to discuss lead times further and the potential for alternative parts.