Description
Product Overview
The U Type Metal Element Open-Air Low Ohm Resistor is designed for high-current measurement and power control applications where precise low resistance and effective thermal performance are required.
As an open-air low ohm resistor, its exposed structure allows efficient natural convection, reducing thermal stress and improving long-term stability.
The U type metal resistive element provides excellent mechanical strength and consistent electrical performance, making this open-air low ohm resistor suitable for demanding industrial environments.
Key Features
U type metal element structure for enhanced current handling
Open-air design enabling efficient heat dissipation
Low resistance values with stable TCR
High pulse and overload capability
Reliable performance under continuous thermal cycling
Specification
| Parameter | Value |
|---|---|
| Resistance Range | 50μΩ – 1mΩ |
| Tolerance | ±1%, ±0.5% |
| Terminal | 2-terminal / 3-terminal (Kelvin) |
| Material | Manganin / Cu-Ni alloy |
| Current Rating | Up to 500A |
| Operating Temperature | -55°C to +170°C |
| Mounting | SMD / screw / PCB weldable |
Product Nominal
| Category | Code / Value | Description |
|---|---|---|
| Material | K | Constantan (Manganese copper wire, Cu-Ni alloy) |
| Pin Pitch | 10 | 1.0 mm |
| Resistance | 20 | 20 mΩ |
| Shape | U | U-type  |
| Other Shapes | M, M2, LX, UZ, HX | M: M-type, LX: Spiral, UZ: Folding feet, HX: Custom |
| Ordering Notes |
| |
| Parameter Guide | A: Wire size meter, H: Height, H1: Pin length, E: Presser foot, W: Pin pitch | |
Product Shape
| Shape 1 | Shape 2 | Shape 3 |
|---|---|---|
| U Type
| UZ Type
| HX Type
|
| M Type
| M2 Type
| LX Type
|
Test Conditions
| Test Conditions | Max Resistance Change (ΔR%) |
|---|---|
| 1000 hours at 25°C (Loading Life) | ≤ 1% |
| 100 hours in Moisture | ≤ 1% |
| 1000 Thermal Cycles (-40°C to +150°C) | ≤ 1% |
Why Choose U Type Open-Air Low Ohm Resistors?
Compared with enclosed or cement resistors, the open-air low ohm resistor offers superior cooling efficiency and faster thermal response.
The U type metal element structure further enhances reliability in high-current and high-temperature operating conditions.
Open-air low ohm resistors are designed based on fundamental resistor principles, including resistance calculation, thermal behavior, and power dissipation (see Electronics Tutorials for general electronics fundamentals).
Applications
DC-DC converter modules for telecom power systems and industrial electronic equipment
Power controllers and inverters for renewable energy and distributed power systems
Current sensing and power regulation circuits in industrial control systems
Motor drives, fan controllers, and HVAC power units for commercial and industrial applications
Compact UPS modules and power distribution boards for critical power management
Explore our full range of precision shunt resistors-M-Type Open Air Current Sense Shunt Resistor
