English
The 12V Blower Motor Resistor from RST Electric is purpose-built for one of the most common failure points in automotive climate control systems: the blower motor speed control. In vehicles with traditional resistor-based fan speed control, the resistor pack dissipates the energy required to reduce voltage to the blower motor for low and medium speeds. Over time, repeated thermal cycling can degrade standard resistors. The RXQ series addresses this with a robust 50W wirewound element rated for 0.15Ω resistance, specifically selected to produce the correct voltage drop for low-speed fan operation in 12V systems.
The construction emphasizes reliability in the demanding automotive environment. The resistive element is housed in a flame-retardant, high-temperature casing that withstands continuous exposure to under-dash temperatures. A critical safety feature is the integrated 240°C thermal fuse, which permanently opens the circuit if the resistor overheats due to fan motor failure, restricted airflow, or prolonged operation at low speed – preventing fire hazards and protecting the vehicle’s wiring harness. The unit is supplied with pre-attached 1.5–2.5mm² leads (150–300mm length), terminated with crimped connectors or bare ends as specified, enabling direct replacement without the need for cutting or splicing.
Each unit undergoes rigorous testing to meet automotive reliability standards. Insulation resistance exceeds 20MΩ at 500VDC, and dielectric withstand is verified at 2000VAC for 5 seconds with no breakdown. Overload testing at 5× rated power for 5 seconds confirms the element’s pulse capability, while temperature cycling from -55°C to +155°C (3 cycles) validates structural integrity. Endurance testing at rated voltage for 1000 hours ensures long-term stability. As a trusted 12V Blower Motor Resistor manufacturer in China, RST Electric combines over 10 years of automotive resistor engineering with precision manufacturing to deliver components that restore proper HVAC function and safety.
|
Parameter |
Specification |
|
Series |
BMR-01 |
|
Application |
12V automotive HVAC blower motor speed control |
|
Rated Power |
50W |
|
Resistance |
0.1Ω-1Ω |
|
Tolerance |
±10% (K) |
|
Thermal Fuse Rating |
240°C (built-in, non-resettable) |
|
Lead Wire Specification |
1.5 – 2.5 mm², length 150 – 300 mm (customizable) |
|
Insulation Resistance |
≥ 20MΩ @ 500V DC |
|
Dielectric Withstanding Voltage |
2000VAC for 5 seconds |
|
Overload Capability |
5× rated power for 5 seconds (ΔR≤ ±1%) |
|
Operating Temperature Range |
-55°C to +155°C (ambient) |
|
Housing Material |
Flame-retardant, high-temperature plastic |
|
Mounting |
Chassis mount (via existing blower housing) |
|
Termination |
Pre-wired leads with connectors or bare ends |
|
Compliance |
RoHS, REACH |
|
Customization |
Lead length, terminal type, thermal fuse temperature |
1.Dedicated 12V Automotive Design – Specifically engineered for 12V vehicle electrical systems, ensuring correct voltage drop for low-speed fan operation.
2.Built-in 240°C Thermal Fuse – Integrated over-temperature protection permanently disconnects the circuit if the resistor overheats, preventing fire hazards.
3.Pre-Wired for Easy Installation – Supplied with 1.5–2.5mm² leads (150–300mm) pre-attached, allowing direct replacement without additional crimping or splicing.
4.Robust Power Handling – 50W rating with wirewound element withstands repeated thermal cycling from continuous low-speed fan operation.
5.Excellent Environmental Durability – Withstands temperature extremes (-55°C to +155°C), vibration (50m/s², 30 min), and humidity (95% RH, 96 hours) per automotive standards.
6.Flame-Retardant Housing – High-temperature, flame-resistant casing ensures safety in under-dash environments where exposure to wiring and insulation is present.
7.High Electrical Safety Margin – 2000VAC dielectric withstand and >20MΩ insulation resistance guarantee safe operation in vehicle electrical systems.
8.Reliable Long-Term Performance – Endurance tested at rated voltage for 1000 hours with ΔR ≤ ±10%, ensuring consistent speed control over years of service.
9.Comprehensive Quality Validation – 100% testing of resistance, insulation, and dielectric strength; sample testing for temperature cycling, vibration, and overload.
10.Customizable for OEM Applications – Available with specific lead lengths, connector types, thermal fuse ratings, and mounting configurations to match original equipment.
|
Vehicle Type |
Specific Application |
Description |
|
Passenger Cars |
HVAC Blower Motor Speed Control |
Direct replacement for failed OEM resistors in cars, SUVs, and light trucks. |
|
Commercial Vehicles |
Cab Climate Systems |
Used in trucks, vans, and delivery vehicles requiring reliable fan speed regulation. |
|
Off-Highway Equipment |
Agricultural & Construction Machinery |
Blower motor control for tractor cabs, excavators, and loaders operating in dusty, high-vibration environments. |
|
Recreational Vehicles (RVs) |
Coach HVAC Systems |
Provides reliable speed control for auxiliary climate systems in motorhomes and camper vans. |
|
Electric & Hybrid Vehicles |
Cabin HVAC |
Compatible with 12V auxiliary systems in EVs and hybrids for cabin comfort. |
|
Aftermarket Replacement |
Blower Motor Resistor Kits |
Ideal for automotive parts distributors and repair shops seeking OE-quality replacement components. |
RST Electric ensures safe delivery of every 12V Blower Motor Resistor:
● Individual Packaging: Each resistor is wrapped in anti-static bubble film and placed in individual boxes to protect the housing and prevent lead damage.
● Lead Protection: Pre-wired leads are coiled and secured with cable ties or foam sleeves to maintain shape.
● Bulk Packaging: For volume orders, resistors are packed in corrugated cartons with foam dividers to prevent contact.
● Documentation: Packing lists and inspection certificates included with each shipment.
● Freight Options: Express courier (DHL/FedEx/UPS) for small quantities, air freight for medium volumes, sea freight for bulk orders.
All units undergo 100% electrical testing (resistance, insulation, dielectric) and visual inspection before packaging.
● We are a certified Manufacturer based in China, specializing in 12V Blower Motor Resistors for over 10 years.
● Complete in-house control over element winding, thermal fuse integration, lead assembly, and testing – ensuring consistent quality.
● Factory-direct pricing on every BMR-01 Series Resistor, with transparent cost structure and no middlemen.
● ISO 9001 certified facilities with dedicated production lines for automotive HVAC components.
● 100% electrical testing (resistance, insulation, dielectric) performed on every unit.
● Sample testing per automotive standards: temperature cycling (-55°C to +155°C), vibration (50m/s²), and endurance (1000 hours).
● Experienced engineering team specializing in 12V automotive resistor applications.
● Proven Supplier to automotive parts distributors, repair chains, and OEM suppliers worldwide.
● Export track record to over 40 countries, including USA, Germany, UK, Australia, and Japan.
● Deep domain expertise in HVAC blower motor speed control and vehicle electrical systems.
● Power ratings: 50W (custom available for different vehicle platforms).
● Resistance values: 0.1Ω-1R (custom values for specific fan speed requirements).
● Thermal fuses: 240°C standard (custom temperature ratings available).
● Lead specifications: 1.5–2.5 mm², 150–300mm (custom lengths and gauges).
● Terminations: Bare ends / OEM connectors / Custom.
● Mounting: Standard chassis mount / Custom brackets.
● Standard lead time: 10-15 days for standard ratings; 15-20 days for customized products.
● Comprehensive documentation: Test reports, material certifications, RoHS/REACH declarations.
● 12-month warranty with remote troubleshooting and spare parts dispatch.
● Technical support available for integration into vehicle HVAC systems.
Address
No. 13, North Shore Road, Huangjiang Town, Dongguan City, Guangdong Province, China
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