Product Attributes

Model No.: JQ-49F

Brand: YM

Ambient Temperature: -55℃~85℃

Sinusoidalvibration: 10g,5Hz～2000Hz

Cyclone: 2.5kPa(25000m)

Coil Powerconsumption: Line coil power consumption: ≤10W (stablevalue)

Dielectricwithstandvoltage: Normal atmospheric pressure:1250Vr.m.s., 50Hz Under low pressure: 300Vr.m. s .,50 Hz

Contact Drop: Initial value ≤120mV Life test less than 180mV

Insulationresistance: ≥ 1 0 0 M Q

Time Parameter: Action time: ≤30 msRelease time: ≤20 ms

Weight: 880g±10%

Military Aviation Contactor JQ-49F:

Premium Direct Replacement for S509 LEACH in Aerospace Systems

YM introduces the JQ-49F Military Aviation Contactor, a superior form-fit-function replacement engineered to seamlessly substitute legacy S509 LEACH contactors in critical aerospace applications. This high-reliability component is specifically designed for demanding power switching operations in drone systems, aircraft engines, and essential circuits across aviation, rail, and aircraft platforms. Manufactured with the precision and durability standards of our Military Metal Relay and High Power Aviation Contactor series, the JQ-49F delivers uncompromising performance where system integrity is paramount.

Product Visualization

YM State-of-the-Art Manufacturing and Assembly Line

Engineering Features & Competitive Advantages

The JQ-49F is engineered as a superior drop-in replacement, incorporating advanced materials and manufacturing techniques refined through our expertise in producing Solid State Relays and Hydraulic Circuit Breakers.

Exact Mechanical & Electrical Compatibility: Designed as a direct, pin-for-pin replacement for S509 LEACH series contactors, enabling effortless system upgrades, maintenance, and lifecycle management without design changes.
Enhanced Contact Performance: Features ultra-low initial contact resistance (≤50mΩ) for optimal power transfer efficiency. Maintains reliable performance throughout extended service life (≤200mΩ post-test), aligning with our premium PCB Board Relay quality benchmarks.
High-Speed Precision Switching: Delivers rapid action time (≤3ms) and release time (≤4ms), providing critical timing accuracy for flight control systems, automated sequences, and sensitive avionics controls.
Military-Grade Hermetic Sealing: Advanced sealed enclosure with maximum leakage rate of ≤10⁻¹ Pa·cm³/s offers superior protection against moisture, dust, chemical exposure, and pressure differentials, utilizing technology proven in our Aviation Oil Sealed Valves.
Extended Operational Lifespan: Rated for 1,000,000 cycles at full rated load (1A, 28V DC), significantly reducing maintenance frequency and total lifecycle costs for mission-critical systems.
Optimized Weight & Power Efficiency: Weighing less than 3 grams with low coil power consumption (0.3-0.43W), ideal for weight-sensitive aerospace applications where thermal management and power budgets are critical.
Robust Electrical Isolation: High dielectric strength (500Vrms at normal pressure) and excellent insulation resistance (>500MΩ) ensure safe, reliable operation in complex electrical environments, compatible with sensitive devices like Aviation Temperature Sensors.
Broad Environmental Compatibility: Engineered to maintain consistent performance across extended temperature ranges and varying atmospheric conditions typical of aerospace operational environments.

Complete Technical Specifications

Electrical Performance Parameters

Coil Power Consumption: 0.3 to 0.43 Watts
Contact Rating & Mechanical Endurance:
- Standard Resistive Load: 1 Ampere at 28 Volts DC for 1,000,000 operations
- Low-Level Signal Load: (10-50) microamperes at (10-50) millivolts for 1,000,000 operations
Contact Resistance Specifications:
- Maximum Initial Value: 50 milliohms (mΩ)
- Maximum Value After Life Testing: 200 milliohms (mΩ)
Dynamic Timing Characteristics:
- Operate (Action) Time: ≤ 3 milliseconds
- Release (Drop-out) Time: ≤ 4 milliseconds
- Minimum Coil Excitation Pulse Width: 10 to 50 milliseconds

Environmental, Safety & Physical Specifications

Dielectric Withstanding Voltage:
- At Standard Atmospheric Pressure: 500 Volts RMS, 50Hz
- Under Low-Pressure Conditions: 250 Volts RMS, 50Hz
Insulation Resistance:
- Initial Measurement: > 500 Megohms (MΩ)
- After High-Level Endurance Testing: > 50 Megohms (MΩ)
Mass: Less than 3 grams
Seal Integrity (Hermeticity): Maximum allowable leakage rate: 1 × 10⁻¹ Pa·cm³/s
Coil Voltage Options (DC): Available in standard aviation DC voltages. Contact for specific voltage requirements or integration with custom Military Aviation Connector solutions. All specifications referenced at 25°C (77°F).

Primary Applications & Industry Use Cases

The JQ-49F serves as a critical Aviation Contactor for Aircraft and specialized industrial applications where absolute reliability cannot be compromised.

Legacy Aircraft System Modernization: Direct replacement for S509 LEACH contactors in power distribution panels, fuel management systems, landing gear controls, environmental control systems, and auxiliary power circuits across military and commercial aviation fleets.
Unmanned Aerial Systems (UAS/Drones): Essential for motor controller enable/disable functions, payload power management (cameras, LIDAR, communication payloads), battery bus switching, and system safety interlocks in advanced commercial and defense drone platforms.
Rail & Ground Transportation Systems: Integration into locomotive control systems, railway signaling equipment, and ground support vehicles where high vibration resistance, extended operational life, and reliability under harsh environmental conditions are mandatory.
Industrial Automation & Control: Deployment in harsh-environment control panels, renewable energy conversion systems, and automated manufacturing equipment, often working in concert with Military Pressure Sensors and Industrial Power Relays for comprehensive control solutions.
Aerospace Test & Qualification Equipment: Provides reliable load switching in test benches, environmental chambers, and qualification systems for Aerospace Components, including Aviation Haulage Pressure Sensors and Military Electronic Horns.
Defense & Military Platforms: Critical switching applications in military ground vehicles, naval systems, communication infrastructure, and specialized defense electronics requiring MIL-spec performance and proven reliability.

Step-by-Step Installation & Integration Protocol

System Verification & Safety Preparation: Confirm the existing component is S509 LEACH series. Execute complete system power-down, implement proper isolation, and follow all applicable safety procedures including lock-out/tag-out (LOTO) protocols.
Legacy Component Removal: Clearly document or photograph the existing wiring configuration. Carefully disconnect all wires from the old contactor terminals. Remove mounting hardware and extract the unit without damaging surrounding components.
JQ-49F Installation: Position the new JQ-49F contactor in the identical mounting location. Secure firmly using appropriate hardware, ensuring no mechanical stress is transferred to the housing, terminals, or printed circuit board.
Electrical Reconnection: Reconnect all wires to their corresponding terminals on the JQ-49F as per documentation. For systems utilizing complex control logic with PCB Signal Relays, verify signal compatibility, voltage levels, and timing requirements.
Pre-Operational Verification: Before applying main power, conduct thorough visual inspection for proper seating and connection. Use a multimeter to verify proper continuity and check for short circuits. Momentarily energize the coil to confirm positive mechanical actuation and audible click.
System Commissioning & Performance Validation: Restore system power gradually. Initiate phased testing protocol: begin with no-load checks, progress to low-power functional tests, and conclude with full operational testing under monitored conditions to validate all performance parameters meet or exceed original system specifications.

Strategic Procurement Benefits

Sourcing the JQ-49F from YM delivers significant value and competitive advantages to global aerospace manufacturers, MRO facilities, and defense system integrators.

Enhanced Supply Chain Resilience: Provides a reliable, high-quality alternative source for obsolete or difficult-to-source S509 LEACH components, mitigating supply chain disruption risks and ensuring operational continuity for legacy systems.
Reduced Total Cost of Ownership: The combination of extended service life, high reliability, and competitive acquisition cost directly lowers long-term maintenance expenses, inventory carrying costs, and operational downtime expenses.
Performance Assurance with Modern Engineering: While maintaining perfect backward compatibility, the JQ-49F benefits from contemporary materials science and advanced manufacturing processes, often delivering improved electrical characteristics, greater consistency, and enhanced durability compared to aging original parts.
Streamlined Logistics & Inventory Management: Consolidating procurement with a trusted manufacturer like YM for critical components, including New Energy Relays and Aviation Microswitches, simplifies supply chain logistics, reduces administrative overhead, and improves procurement efficiency.
Technical Partnership & Engineering Support: Access to YM's cross-industry expertise from Automotive Relay and Metal Sealing Relay manufacturing provides comprehensive application support, system integration guidance, and troubleshooting assistance throughout the product lifecycle.
Quality Assurance & Compliance Documentation: Full manufacturing traceability, comprehensive testing documentation, and rigorous quality control procedures provide confidence in component performance and support certification requirements for end-products in regulated industries.