Metal Clad Resistor

The Metal Clad Resistor from RST Electric represents an advanced solution for applications requiring high pulse capability in a compact, low profile package. Unlike conventional power resistors, this Low Profile Resistor features a specialized wirewound element encapsulated within a rugged metal clad housing, designed specifically for heatsink mounting to achieve enhanced power dissipation. When mounted on an appropriate heatsink, the power rating doubles – for example, the RXLT150 delivers 150W without heatsink and 300W with heatsink, providing exceptional design flexibility for engineers balancing space and thermal requirements.

The construction emphasizes reliability under extreme conditions: each unit withstands pulse overloads of 10 times rated power for 5 seconds, making it ideal for capturing regenerative energy in braking circuits and surviving transient surges in inverter applications. Standard 600V-rated cables simplify field wiring and ensure safe operation in medium-voltage industrial environments. The low profile form factor – with heights significantly reduced compared to traditional tubular or chassis mount resistors – allows installation in shallow enclosures, motor terminal boxes, or direct attachment to drive chassis.

Electrical performance is validated through rigorous testing: insulation resistance exceeds 10GΩ at 500V, and dielectric withstand is verified at 4000V AC, ensuring safe operation in high-voltage systems. The temperature coefficient is maintained within ≤ ±150 ppm/°C, guaranteeing stable resistance values across the operating range up to +250°C surface temperature. As a trusted Metal Clad Resistor manufacturer in China, RST Electric combines over 10 years of power resistor engineering expertise with precision manufacturing to deliver components that meet the demanding requirements of modern power electronics.

Technical Specification

Product Features

1.High Pulse Capability – Withstands pulse overloads of 10 × rated power for 5 seconds, ideal for capturing regenerative energy in braking circuits and surviving transient surges .

2.Low Profile Design – Compact form factor enables installation in shallow enclosures, motor terminal boxes, and space-constrained drive systems .

3.Flexible Power Ratings – Dual wattage ratings (with/without heatsink) provide design flexibility; power doubles when properly heatsink mounted .

4.High Voltage Cables – Standard 600V-rated cables simplify field wiring and ensure safe operation in medium-voltage industrial applications .

5.Superior Insulation – Insulation resistance ≥ 10GΩ @ 500V and dielectric withstand of 4000V AC guarantee safe operation in high-voltage systems .

6.Low TCR – Temperature coefficient ≤ ±150 ppm/°C ensures stable resistance values across the full operating range up to +250°C .

7.Optimized for Braking & Inverter Apps – Specifically designed for dynamic braking circuits, inverter/converter protection, and motor drive applications .

8.Robust Metal Clad Construction – Aluminum alloy housing provides mechanical protection and efficient heat transfer to the mounting surface.

9.Wide Resistance Range – From 2.2Ω to 1.1kΩ covering diverse current sensing and energy dissipation requirements.

Product Applications

Drawing and dimensions

Type   L1(±3) L2(±2)

RXLT150 80 56

RXLT200 110 86

RXLT300 163 139

RXLT400 216 192

RXLT500 270 246

RXLT600 300 276

Package and shipment

Independent Packaging

RST Electric attaches great importance to the safety of product transportation. Each Metal Clad Resistor is packaged independently. It is first wrapped with anti-static electrical bubble film, and then placed in an independent packaging box. This provides comprehensive protection for the metal casing and cable terminals, avoiding damage caused by friction and collision during transportation.

Different Packaging Designs

The cables will be rolled up, sorted, and secured with cable ties to prevent damage during transportation; for bulk orders, corrugated cardboard boxes are used for packaging, with foam partitions inside to prevent the resistors from colliding with each other.

Flexible Freight Services

Each batch of goods is accompanied by a packing list and inspection certificate, facilitating customers' compliance verification. The freight methods are flexible, with DHL/FedEx/UPS express for small batches, air freight for medium batches, and sea freight for large batches, catering to various needs.

Strict Testing

All products undergo 100% electrical testing before packaging. The key tests include resistance value, insulation, and dielectric strength. Only after meeting the performance standards will they be shipped, ensuring the stable operation of the products.

Why choose RST Electric？

When pulse capability and compact design matter, RST Electric delivers.

Direct Factory, Metal Clad Specialists

● We are a certified Manufacturer based in China, specializing in Metal Clad Resistor production for over 10 years.

● Complete in-house control over wirewound element manufacturing, metal housing fabrication, and final assembly – ensuring consistent quality.

● Factory-direct pricing on every Low Profile Resistor, with transparent cost structure and no middlemen.

Professional Manufacturing & Quality Assurance

● ISO 9001 certified facilities with dedicated production lines for high-pulse resistors.

● 100% electrical testing (resistance, insulation, dielectric) performed on every unit.

● Pulse overload validation ensures each resistor meets 10 × rated power capability .

● Experienced engineering team specializing in braking and inverter applications.

🌍 Global Experience, Trusted Supplier

● Proven Supplier to motor drive manufacturers, inverter producers, and renewable energy system integrators worldwide.

● Export track record to over 40 countries, including Germany, USA, Japan, South Korea, and Italy.

● Deep domain expertise in applications requiring high pulse handling and compact design.

Endless Customization

● Power ratings: 150W to 600W (higher available in custom configurations).

● Resistance values: 2.2Ω to 1.1kΩ (special values available).

● Tolerance: ±5% (custom tolerances available on request).

● Cable lengths: Standard or custom lengths available.

● Terminations: 600V-rated cables / Custom connectors / Flying leads.

● Mounting: Standard heatsink mount / Custom brackets.

Reliable Delivery & Lifetime Support

● Standard lead time: 7-10 days for standard ratings; 15-20 days for custom configurations.

● Comprehensive documentation: Test reports, material certifications, RoHS/CE declarations.

● Technical support available for integration into drives, inverters, and braking systems.