SPST SPDT 80A 40A 50A auto relay NVF4-3 NVF4-4

Product Overview

The NVF4-3 and NVF4-4 series high-power auto relays are engineered for demanding automotive, commercial vehicle, industrial machinery, and renewable energy applications requiring robust switching capability up to 80A. The series includes SPST (NVF4-3, 1 Form A) and SPDT (NVF4-4, 1 Form C) configurations, with current ratings of 40A, 50A, or 80A to match diverse load requirements. These relays combine low coil power consumption (0.3–0.43W) with high contact stability, fast response, and excellent environmental sealing. As part of YM's comprehensive relay portfolio—which includes Automotive Relay, Industrial Power Relay, Metal Sealing Relay, PCB Board Relay, and Solid State Relay—the NVF4 series delivers proven reliability for heavy-duty switching in harsh environments.

Technical Specifications

• Series Models: NVF4-3 (SPST, 1 Form A, normally open); NVF4-4 (SPDT, 1 Form C, changeover)
• Contact Current Ratings: 40A, 50A, or 80A (resistive load, 28V DC / 14V DC)
• Coil Voltage Options: 12V DC, 24V DC (custom available)
• Coil Power Consumption: 0.3 – 0.43 W (ultra-low for high-power relay)
• Contact Resistance: Initial ≤50mΩ; after life test ≤200mΩ
• Operate Time: ≤4ms (typical ≤3ms)
• Release Time: ≤4ms
• Dielectric Strength (Normal Pressure): 500V RMS @ 50Hz
• Dielectric Strength (Low Pressure): 250V RMS @ 50Hz
• Insulation Resistance: >500 MΩ (standard); >50 MΩ after life test
• Weight: <3 grams (ultra-light for high-current design)
• Sealing Performance: Maximum leakage rate ≤1.0 × 10⁻³ Pa·cm³/s (hermetic option available)
• Operating Temperature: -40°C to +85°C

All specifications validated at 25°C. Higher current versions (80A) use enlarged contact tips and silver-tin oxide material for arc resistance.

Product Features & Competitive Advantages

1. High Continuous Current Rating: Available in 40A, 50A, and 80A versions, suitable for starter motors, winches, battery isolators, and high-power lighting.
2. SPST or SPDT Configurations: NVF4-3 (SPST, normally open) for simple on/off control; NVF4-4 (SPDT) for changeover applications like high/low beam or polarity reversal.
3. Ultra-Low Coil Power Consumption: Only 0.3–0.43W coil power reduces heat and electrical load on vehicle control modules, enabling direct drive from PLC or microcontroller.
4. Fast Switching Response: ≤4ms operate/release time ensures precise timing for safety systems and high-speed automation.
5. Excellent Arc Suppression & Long Life: AgSnO₂ contact material provides superior resistance to contact welding and arc erosion, achieving 100,000 electrical cycles at rated load.
6. Hermetic Sealing Option: Leakage rate ≤10⁻³ Pa·cm³/s protects against moisture, dust, and corrosive gases, making it ideal for under-hood and outdoor industrial installations.

Installation & Wiring Steps

1. Select Correct Model: Choose NVF4-3 (SPST) for simple on/off loads; choose NVF4-4 (SPDT) for changeover circuits (e.g., motor forward/reverse or dual lighting).
2. Mounting: Secure relay to panel or PCB using M5 screw or standard automotive relay socket (ISO 280). Ensure adequate clearance for high-current cables.
3. Coil Connection: Connect coil terminals (typically 85 and 86) to 12V/24V DC control signal. Observe polarity if diode or resistor is integrated (check datasheet).
4. Load Wiring (SPST - NVF4-3): Connect power source to terminal 30, load to terminal 87. For dual loads, use both 87 terminals if available.
5. Load Wiring (SPDT - NVF4-4): Connect common (30) to source; normally closed (87a) to default load; normally open (87) to alternate load.
6. Functional Test: Apply coil voltage – verify continuity between 30 and 87 (SPST) or between 30 and 87 (SPDT) with no continuity to 87a. Remove voltage – verify reverse.
7. Integration with Sensors: For automated protection, pair with Hydraulic Circuit Breaker, Aviation Temperature Sensor, or Military Pressure Sensor for overcurrent or temperature-based cut-off.

Application Scenarios

The NVF4-3/NVF4-4 high-power relays are deployed in heavy-duty electrical systems:

• Automotive & Heavy Truck: Starter motor relays, cooling fan control, headlight high/low beam (SPDT), battery isolators, and winch contactors.
• Commercial & Off-Highway Vehicles: Agricultural equipment, construction machinery, and material handling – switching hydraulic pump motors and work lights.
• Industrial Automation: High-current solenoid valves (compatible with Aviation Cold Air Solenoid Valve), conveyor motors, and industrial oven heaters.
• Renewable Energy: Solar battery bank switching, DC load shedding, and inverter bypass relays.
• Marine & RV: Bow thruster control, anchor winches, and house battery bank isolation.

Value Proposition for B2B Buyers

• Increased System Safety: High interrupting capacity and arc-resistant contacts reduce fire risk and contact welding in high-current circuits.
• Longer Operational Life: 100,000-cycle electrical life at rated load lowers maintenance and replacement frequency.
• Energy Efficient Coil: Low coil power (0.3–0.43W) reduces heat and enables direct control from low-power logic (PLC, automotive ECU).
• Global Compliance: Manufactured under ISO 9001:2015, RoHS, REACH; models can be certified to UL, TUV upon request.
• Flexible Customization: YM offers custom coil voltages, contact materials, terminal styles, and hermetic sealing for OEM projects.

Certifications & Compliance

The NVF4 series high-power relays are designed to meet international standards for automotive and industrial relays. Our facility operates under ISO 9001:2015 quality management. Key compliance includes:

• IEC 61810-1 – Electromechanical elementary relays
• RoHS 2011/65/EU – Restriction of hazardous substances
• REACH (EC 1907/2006) – Chemical compliance
• ISO 16750 – Road vehicles – Environmental conditions (vibration, temperature, humidity)

Each relay is 100% tested for coil resistance, pickup/dropout voltage, contact resistance, and dielectric strength. High-current versions undergo additional temperature rise and contact welding tests.

Customization Options

YM provides extensive OEM/ODM customization for the NVF4 series to meet specific application requirements:

• Coil Voltage: 6V, 12V, 24V, 48V DC, or custom AC coils.
• Contact Configuration: SPST (1A), SPDT (1C), or DPST (2A) on request.
• Current Rating: 30A, 40A, 50A, 60A, 80A, 100A (with appropriate contact material).
• Contact Material: AgSnO₂ (standard for high current), AgCdO, or AgNi for specific loads.
• Sealing Level: Flux-tight, washable, or hermetic sealing (≤10⁻³ Pa·cm³/s).
• Terminal Style: Quick-connect tabs (6.3mm or 4.8mm), PCB pins, or screw terminals.
• Integrated Features: Resistor or diode across coil for spike suppression.

Production Process & Quality Assurance

1. Incoming Material Inspection: Contact materials, coil wire, housings, and terminals are certified and tested to specifications.
2. Precision Coil Winding: Automated winding ensures consistent resistance (±5%) and insulation integrity.
3. Contact & Armature Assembly: High-current contacts are silver-tin oxide alloy, assembled in clean-room environment with precision spring adjustment.
4. Calibration: Pickup/dropout voltage and contact follow are set to datasheet limits using automated test equipment.
5. 100% Functional & Safety Testing: Every relay undergoes coil resistance, operate/release time, contact resistance (≤50mΩ), dielectric strength (500V RMS), and temperature rise test (at rated current).
6. Life Cycle Sampling: Statistical sampling for electrical life (100,000 ops at rated load) and mechanical life (10 million ops).
7. Sealing Test (Hermetic versions): Helium mass spectrometry verifies leakage rate ≤10⁻³ Pa·cm³/s.
8. Final Visual & Packaging: Laser marking of model, date code, current rating, and lot number. Packaged in anti-static tubes or bulk boxes for automated assembly.