auto relay NVF4-2aC-S30aR with resistance

Product Overview

The NVF4-2aC-S30aR Auto Relay is a high-performance, double-pole single-throw (DPST, 2 Form A) relay featuring an integrated resistance element for optimized coil drive and EMI suppression. Designed for 12V/24V automotive and industrial control systems, it provides reliable switching of loads up to 1A at 28V DC while maintaining ultra-low coil power consumption. The built-in resistor simplifies circuit design by eliminating the need for external flyback diodes or current-limiting components. As part of YM's extensive relay portfolio—which includes Automotive Relay, PCB Board Relay, Metal Sealing Relay, Industrial Power Relay, and Solid State Relay—the NVF4 series delivers consistent contact performance, fast response, and excellent environmental sealing for demanding applications.

Technical Specifications

• Model: NVF4-2aC-S30aR (2 Form A – DPST normally open)
• Coil Voltage Options: 12V DC, 24V DC (custom available)
• Coil Power Consumption: 0.3 – 0.43 W (typical 0.36W)
• Integrated Resistance: Built-in series resistor for current limiting and back-EMF suppression
• Contact Arrangement: 2aC – two independent normally open contacts
• Contact Load (Resistive): 1A at 28V DC, 100,000 operations minimum
• Low-Level Signal Capability: (10-50)μA at (10-50)mV for 100,000 cycles
• Contact Resistance: Initial ≤50mΩ; after life test ≤200mΩ
• Operate Time: ≤4ms (typical ≤3ms)
• Release Time: ≤4ms
• Incentive Pulse Width: 10–50 ms
• Dielectric Strength (Normal Pressure): 500V RMS @ 50Hz
• Dielectric Strength (Low Pressure): 250V RMS @ 50Hz
• Insulation Resistance (Standard): >500 MΩ
• Insulation Resistance (After Life): >50 MΩ
• Weight: <3 grams
• 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. The "S30aR" suffix indicates the integrated resistor value (e.g., 30Ω series) for coil current control.

Product Features & Competitive Advantages

1. Integrated Resistance Design: Built-in series resistor eliminates the need for external current-limiting or flyback components, simplifying PCB layout and reducing BOM cost.
2. DPST (2 Form A) Configuration: Two independent normally open contacts allow simultaneous switching of two separate loads from a single coil – ideal for redundant circuits or dual-channel control.
3. Ultra-Low Coil Power: Consumes only 0.3–0.43W, minimizing heat generation and enabling direct drive from microcontrollers without additional transistors.
4. Fast Switching Speed: ≤4ms operate/release time ensures real-time response for safety interlocks and high-speed automation.
5. Excellent Contact Stability: Maintains low contact resistance throughout 100,000+ operations, critical for low-level signal switching in sensor circuits like Aviation Temperature Sensor or Military Pressure Sensor.
6. Hermetic Sealing Option: Leakage rate ≤10⁻³ Pa·cm³/s protects against moisture, dust, and corrosive gases – suitable for under-hood and outdoor equipment.

Installation & Wiring Steps

1. Pin Configuration Verification: Identify coil terminals (with built-in resistor, polarity may be required for proper operation – check datasheet). Identify contact terminals (two independent sets, each with common and NO).
2. PCB Mounting: Insert relay into pre-drilled PCB holes. Ensure correct orientation (marked by polarity dot or notch). Solder at ≤350°C for ≤3 seconds per pin.
3. Coil Connection: Apply rated DC voltage (12V or 24V) respecting polarity if specified. The internal resistor will limit current to 0.3–0.43W.
4. Load Wiring: Connect each load circuit to its respective common and NO terminals. For DPST, both contacts close simultaneously when coil is energized.
5. Functional Test: Energize coil – verify continuity (low resistance) across both contact sets. De-energize – verify open circuit (infinite resistance).
6. Integration with Sensors: For automated control, pair with Aviation Haulage Pressure Sensor or Hydraulic Circuit Breaker for pressure-based or overcurrent protection.

Application Scenarios

The NVF4-2aC-S30aR relay is deployed across automotive, industrial, and renewable energy systems where integrated resistance simplifies design:

• Automotive Electronics: Headlight high/low beam control, horn relay (compatible with Military Electronic Horn), cooling fan switching, and power window circuits – internal resistor suppresses coil spikes.
• Commercial Vehicles (Trucks, Buses): 12V/24V system control for auxiliary lights, air conditioning clutches, and diagnostic interfaces.
• Industrial Automation: PLC output expansion, conveyor interlocking, and control of Aviation Cold Air Solenoid Valve in pneumatic systems.
• Battery Management Systems (BMS): Cell balancing, protection circuit switching, and load disconnection – integrated resistor reduces EMI interference with sensitive measurement circuits.
• Renewable Energy: Solar charge controller logic, inverter standby switching, and DC load shedding.

Value Proposition for B2B Buyers

• Enhanced System Reliability: 100,000-cycle electrical life and stable contact resistance reduce field failures and warranty claims.
• Simplified Circuit Design: Integrated resistor eliminates external flyback diode and current-limiting components, reducing PCB space and assembly cost.
• Energy-Efficient Operation: Low coil power (0.3–0.43W) minimizes heat generation and extends battery life in 12V/24V systems.
• Global Compliance: Manufactured under ISO 9001:2015 with RoHS and REACH compliance, supporting international export.
• Cost-Effective Customization: Low MOQ for custom coil voltages, resistor values, contact materials, and packaging – ideal for OEM programs.

Certifications & Compliance

The NVF4-2aC-S30aR relay is designed and manufactured 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 (compliant design)

Each relay is 100% tested for coil resistance (including internal resistor), pickup/dropout voltage, contact resistance, and dielectric strength. Traceability codes are laser-marked on the housing.

Customization Options

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

• Coil Voltage & Resistor Value: 5V, 12V, 24V DC with custom series resistor values (e.g., 10Ω, 30Ω, 100Ω).
• Contact Material: Silver alloy (standard), gold-plated (low-level signal), or silver-tin oxide (high inrush).
• Sealing Level: Flux-tight (standard), washable, or hermetic sealing (≤10⁻³ Pa·cm³/s).
• Terminal Style: PCB pins, quick-connect tabs, or wire leads.
• Special Markings: Private labeling, custom part numbers, and bulk/tube packaging.
• Enhanced Environmental Protection: Conformal coating for high-humidity or vibration-prone environments.

Production Process & Quality Assurance

1. Incoming Material Inspection: Coil wire, contact metals, resistors, and plastic housings are certified and sampled for compliance.
2. Precision Coil Winding & Resistor Integration: Automated winding ensures consistent resistance (±5%); resistors are soldered in series with the coil.
3. Contact & Armature Assembly: Clean-room assembly of moving and stationary contacts, spring, and armature.
4. Calibration: Pickup/dropout voltage and contact follow are adjusted to datasheet limits.
5. 100% Functional Testing: Every relay undergoes coil resistance (including resistor), operate/release time, contact resistance, and dielectric strength (500V RMS) testing.
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, and lot number. Packaged in anti-static tubes or tape-and-reel for automated assembly.