Auto Relay NT75L A S F

Product Overview

The NT75L A S F Auto Relay is a high-performance, double-pole double-throw (DPDT) relay engineered for 12V/24V automotive, commercial vehicle, and industrial control systems. With low coil power consumption, fast switching response, and excellent contact stability, it provides reliable load switching and signal routing in demanding environments. As part of YM's extensive relay family—which includes Automotive Relay, PCB Board Relay, Metal Sealing Relay, Industrial Power Relay, and Solid State Relay—the NT75L series delivers proven durability and consistent performance for mission-critical circuits.

Technical Specifications

• Model: NT75L A S F (DPDT configuration)
• Coil Voltage Options: 12V DC, 24V DC (custom available)
• Coil Power Consumption: 0.3 – 0.43 W (typical 0.36W)
• Contact Arrangement: 2C (two form C, double-pole double-throw)
• 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
• Operating Temperature: -40°C to +85°C

All specifications validated at 25°C. Custom coil voltages and contact materials available.

Product Features & Competitive Advantages

1. DPDT (2C) Configuration: Provides two independent changeover contact sets, allowing control of two separate circuits or load types from a single relay – ideal for complex logic.
2. Ultra-Low Coil Power: Consumes only 0.3–0.43W, reducing heat generation and enabling direct drive from logic circuits (PLC, microcontroller).
3. Fast Switching Speed: ≤4ms operate/release time ensures real-time response for safety interlocks, lighting control, and solenoid drivers.
4. High Contact Stability: Maintains low contact resistance throughout 100,000+ operations, critical for low-level signal switching in sensor circuits.
5. Hermetic Sealing Option: Leakage rate ≤10⁻³ Pa·cm³/s protects contacts from dust, moisture, and corrosive atmospheres – suitable for under-hood and outdoor installations.
6. Versatile Compatibility: Works seamlessly with other YM components such as Aviation Microswitch, Hydraulic Circuit Breaker, and Aviation Temperature Sensor in integrated systems.

Installation & Wiring Steps

1. Pin Identification: Refer to the datasheet for coil terminals (typically pins 1 and 2) and contact terminals (common, NC, NO for each of the two poles).
2. PCB Mounting (through-hole): Insert relay into pre-drilled PCB holes. Ensure correct orientation (marked by a dot or notch). Solder at ≤350°C for ≤3 seconds per pin.
3. Socket Mounting (optional): Use a standard relay socket (e.g., 8-pin mini relay socket) for plug-and-play replacement.
4. Coil Connection: Apply rated coil voltage (12V or 24V DC). Do not exceed 10% tolerance.
5. Load Wiring: Connect loads to appropriate COM/NC/NO terminals. For DPDT, each pole can control independent loads (e.g., one for a motor, one for a warning light).
6. Functional Test: Energize coil and verify continuity between COM and NO; de-energize and verify continuity between COM and NC. Measure contact resistance (<50mΩ).
7. Integration with Sensors: For automated control, pair with Military Pressure Sensor or Aviation Haulage Pressure Sensor for pressure-based switching.

Application Scenarios

The NT75L A S F relay is deployed across automotive, industrial, and renewable energy applications:

• Automotive Electronics: Headlight high/low beam switching, horn control (compatible with Military Electronic Horn), cooling fan relays, and power window circuits.
• Commercial Vehicles (Trucks, Buses): 12V/24V system control for auxiliary lights, air conditioning clutches, and diagnostic interfaces.
• Industrial Automation: PLC output expansion, conveyor system interlocking, and control of Aviation Cold Air Solenoid Valve in pneumatic systems.
• Renewable Energy: Solar inverter control, battery management system (BMS) logic switching, and DC load shedding.
• Marine & Off-Highway Equipment: Navigation lights, bilge pumps, agricultural machinery controls, and Hydraulic Circuit Breaker panels.

Value Proposition for B2B Buyers

• Enhanced System Reliability: 100,000-cycle electrical life and stable contact resistance reduce field failures and warranty claims.
• Energy-Efficient Design: Low coil power consumption minimizes heat generation and extends battery life in 12V/24V systems.
• Simplified PCB Integration: Standard footprint and pinout allow easy integration with existing PCB Board Relay and Automotive Relay layouts.
• Global Compliance: Manufactured under ISO 9001:2015 with RoHS and REACH compliance, supporting international export.
• Cost-Effective Customization: Low MOQ for custom coil voltages, contact materials, and packaging – ideal for OEM programs.

Certifications & Compliance

The NT75L A S F 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, 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 NT75L series to meet specific application requirements:

• Coil Voltage: 12V DC, 24V DC (standard), 48V DC, or custom AC coils.
• 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 screw terminals.
• 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, and plastic housings are certified and sampled for compliance.
2. Precision Coil Winding: Automated winding ensures consistent resistance (±5%) and insulation integrity.
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, 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.