Product Attributes

Model No.: JQ-91F

Brand: YM

Ambient Temperature: -60℃~85℃

Random Vibration: 0.04g²/Hz,10Hz～2000Hz

Relativehumidity: 98% at 40℃

Cyclone: 2.5kPa(25000m)

Coil Powerconsumption: Line coil power consumption:≤5.8W (stable value)

Dielectricwithstandvoltage: Normal atmospheric pressure:1500Vr.m.s., 50Hz Under low pressure: 300Vr.m. s .,50 Hz

Contact Drop: Initial value ≤125mV Life test less than 150mV

Insulationresistance: ≥ 1 0 0 M Q

Time Parameter: Action time: ≤25 msRelease time: ≤15 ms

Weight: ≤241g

Military Aviation Contactor JQ-91F:

Dual-Compatible Replacement for 2505 ECE & S77 LEACH

YM introduces the JQ-91F Military Aviation Contactor, a premium dual-compatible component engineered to directly replace both 2505 ECE and S77 LEACH contactors in critical aerospace and defense applications. This high-reliability solution provides precise power switching for drone propulsion systems, aircraft engines, and essential circuits across aviation, rail, and aerospace platforms. Manufactured with the same rigorous standards as our Military Metal Relay and High Power Aviation Contactor series, the JQ-91F delivers exceptional performance while offering significant logistical advantages for legacy system maintenance and sustainment programs.

Product Visualization

YM Advanced Manufacturing Processes and Quality Control Systems

Engineering Features & Dual-System Advantages

The JQ-91F represents advanced replacement technology designed to address specific requirements of two common legacy systems, incorporating modern engineering principles from our Solid State Relay and Hydraulic Circuit Breaker development programs.

Dual-Model Compatibility: Direct form-fit-function replacement for both 2505 ECE and S77 LEACH contactor series, dramatically reducing inventory complexity and procurement challenges for maintenance, repair, and overhaul (MRO) operations.
Enhanced Contact Performance: Features ultra-low initial contact resistance (≤50mΩ) for optimal power transfer efficiency and minimal voltage drop. Maintains reliable performance throughout extended service life (≤200mΩ post-test), consistent 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 in demanding applications.
Military-Grade Hermetic Sealing: Advanced sealed enclosure with maximum leakage rate of ≤10⁻¹ Pa·cm³/s offers superior protection against moisture ingress, 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 extending maintenance intervals and reducing total lifecycle costs for mission-critical systems across multiple platforms.
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 design considerations.
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, from ground level to high-altitude applications.

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 & Replacement Scenarios

The JQ-91F serves as a critical Aviation Contactor for Aircraft maintenance and system upgrades across multiple industries, offering unique dual-compatibility advantages for diverse operational environments and legacy systems.

Legacy Aircraft System Modernization: Direct replacement for both 2505 ECE and S77 LEACH contactors in power distribution panels, fuel management systems, landing gear controls, environmental control systems, and auxiliary power circuits across diverse military and commercial aviation fleets.
Unmanned Aerial Systems (UAS/Drones): Essential for motor controller enable/disable functions, payload power management (sensor systems, communication payloads), battery bus switching, and system safety interlocks in advanced commercial, industrial, 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 dual-system compatibility significantly simplify maintenance logistics and reduce spare parts inventory requirements.
Industrial Automation & Control Systems: Deployment in harsh-environment control panels, renewable energy systems, and automated manufacturing equipment, often working alongside 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, where compatibility with multiple legacy systems is advantageous.
Defense & Military Platform Sustainment: Critical for maintaining operational readiness of legacy military systems that utilize either 2505 ECE or S77 LEACH contactors in communication systems, vehicle electronics, radar equipment, and specialized defense systems requiring MIL-spec reliability and performance.

Step-by-Step Replacement Protocol

System Identification & Verification: Confirm the existing component is either 2505 ECE or S77 LEACH series. Document the specific model, system configuration, operating parameters, and environmental conditions before proceeding with replacement.
Safety Preparation & System Shutdown: Execute complete system power-down following established procedures. Implement proper electrical isolation and follow all applicable safety protocols including lock-out/tag-out (LOTO) for the specific platform and operational environment.
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, wiring harnesses, or mounting surfaces.
JQ-91F Installation: Position the new JQ-91F contactor in the identical mounting location. Secure firmly using appropriate hardware with specified torque values, ensuring proper alignment, mechanical integrity, and no stress on the housing or terminals.
Electrical Reconnection: Reconnect all wires to their corresponding terminals on the JQ-91F as per documentation. For systems utilizing complex control logic with PCB Signal Relays, verify signal compatibility, voltage levels, and retest timing parameters to ensure proper system integration.
Pre-Operational Verification & Testing: Before applying main power, conduct thorough visual inspection for proper installation. Use a multimeter to verify proper continuity, insulation resistance, and absence of short circuits. Momentarily energize the coil to confirm positive mechanical actuation and audible indication of proper operation.
System Commissioning & Performance Validation: Restore system power gradually according to platform-specific procedures. Initiate comprehensive 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 system requirements for both legacy system types.

Strategic Procurement & Operational Benefits

Sourcing the JQ-91F from YM delivers exceptional value through comprehensive inventory consolidation, enhanced system reliability, and dedicated technical support for legacy system sustainment programs.

Inventory Consolidation & Management Efficiency: Replaces two common legacy part numbers with a single, high-quality component, reducing inventory complexity by up to 50% for affected systems and significantly streamlining maintenance, repair, and overhaul (MRO) procedures across multiple platforms.
Enhanced Supply Chain Resilience: Provides a reliable, manufacturer-direct source for obsolete components, mitigating supply chain disruption risks and ensuring operational continuity for diverse legacy systems with extended service life requirements.
Reduced Total Cost of Ownership (TCO): Extended service life, reduced maintenance frequency, and simplified inventory management directly lower long-term operational expenses while improving maintenance efficiency through reduced part number proliferation and associated administrative overhead.
Performance Enhancement through Modern Engineering: While maintaining perfect mechanical and electrical compatibility, the JQ-91F incorporates contemporary materials and manufacturing advancements that often deliver improved performance characteristics over aging original components, potentially extending system operational life.
Technical Partnership & Cross-Platform Expertise: Access to YM's extensive experience across multiple product lines including New Energy Relays, Automotive Relays, and Aviation Microswitches provides comprehensive application support for diverse integration scenarios and system modernization projects.
Quality Assurance & Certification Support: Full manufacturing traceability, comprehensive testing documentation, and rigorous quality control procedures provide confidence in component performance and support certification requirements for regulated industries including aerospace, defense, and transportation sectors.
Future-Proofing Legacy Systems: Provides a reliable, sustainable solution for maintaining operational capability of aging systems while offering potential performance benefits and extended service life compared to original components, supporting longer system lifecycles and reducing overall system modernization costs.