Three Phase Aviation DC Contactor JQ-QY33F

JQ-QY33F Military Aviation Contactor:

Direct Replacement for CA175 LEACH with Enhanced Performance

The JQ-QY33F Military Aviation Contactor is a high-reliability, form-fit-function replacement for the legacy CA175 LEACH contactor, specifically engineered for critical aerospace power distribution applications. As part of YM's specialized Military Aviation Contactor series, this component delivers superior performance in drone systems, aircraft engines, and other demanding aviation environments where power switching reliability is non-negotiable.

This contactor maintains full mechanical and electrical compatibility with existing CA175 LEACH installations while offering improved characteristics in key areas. Designed and manufactured with the same rigorous standards applied to our comprehensive range of Military Metal Relays and Industrial Power Relays, the JQ-QY33F represents a reliable upgrade path for aging systems.

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Technical Specifications

Electrical Performance Characteristics

• Coil Power Consumption: (0.3 ~ 0.43)W – Energy-efficient operation reduces system thermal load
• Contact Load Rating & Lifespan:
  • Resistive Load: 1A at 28V DC for 100,000 minimum cycles
  • Low-Level Signal Capability: (10~50)μA, (10~50)mV for 100,000 cycles (ideal for control signals)
• Contact Resistance Specifications:
  • Initial Contact Resistance: ≤ 50mΩ
  • Maximum After Endurance Testing: ≤ 200mΩ
• Timing Parameters:
  • Actuation Time: ≤ 4ms
  • Release Time: ≤ 4ms
  • Minimum Reliable Actuation Pulse: (10～50) ms

Environmental & Mechanical Specifications

• Dielectric Strength (Hi-Pot):
  • Standard Atmospheric Conditions: 500V RMS, 50Hz
  • Low Pressure/High Altitude Conditions: 250V RMS, 50Hz (maintains safety margins)
• Insulation Resistance:
  • Initial Measurement: > 500 MΩ
  • After Accelerated Life Testing: > 50 MΩ
• Weight: < 3 grams – Lightweight design for aerospace applications
• Hermetic Sealing Standard: Maximum leakage rate ≤ 1 × 10⁻³ Pa·cm³/s – Ensures environmental protection
• Reference Conditions: All electrical specifications are referenced at 25°C (77°F)

Product Features & Advantages

• Direct CA175 LEACH Replacement: Full mechanical and electrical compatibility allows seamless upgrade without system modifications, providing an immediate solution for obsolescence management.
• Enhanced Reliability: Engineered for 100,000+ operational cycles, exceeding typical aerospace maintenance intervals and reducing total lifecycle costs.
• Dual-Purpose Contact Design: Capable of handling both power switching (1A/28VDC) and sensitive control signals, offering design flexibility similar to advanced PCB Signal Relays.
• Military-Grade Environmental Sealing: Hermetic sealing provides complete protection against moisture, dust, and corrosive agents, matching the standards of our Aviation Oil Sealed Valves.
• Fast Switching Performance: Sub-4ms actuation and release times ensure rapid system response critical for flight control and safety systems.
• High-Altitude Performance Certification: Maintains specified dielectric strength under reduced atmospheric pressure, essential for aircraft operational envelopes.
• Optimized Weight & Size: Lightweight design (<3g) contributes to overall aircraft weight reduction while maintaining robust construction.
• Vibration & Shock Resistant: Designed to withstand harsh aerospace vibration profiles, reflecting YM's expertise in Military Electronic components.
• Improved Manufacturing Consistency: Modern production techniques ensure tighter tolerances and more consistent performance than original CA175 units.

Installation & Integration Procedure

For successful integration of the JQ-QY33F as a CA175 LEACH replacement, follow these steps:

1. System Compatibility Verification: Confirm that the existing system voltage (typically 28V DC aircraft systems) matches the contactor's coil specifications and that load currents are within rated parameters.
2. Physical Inspection: Verify the JQ-QY33F matches the mechanical footprint and terminal configuration of the CA175 LEACH unit being replaced.
3. Safe System Preparation: De-energize the aircraft system following proper maintenance procedures. Disconnect power sources and implement lock-out/tag-out protocols.
4. Direct Replacement Installation: Remove the existing CA175 contactor and install the JQ-QY33F using the same mounting hardware and connections. Ensure proper torque on all electrical connections.
5. Wiring Verification: Confirm all connections match the original configuration. For control circuits operating at low signal levels (μA/mV), ensure wiring practices align with those used for sensitive components like Aviation Temperature Sensors.
6. Functional Testing: Before returning the system to service, perform comprehensive testing including contact resistance measurement, actuation timing verification, and insulation resistance testing.
7. System Validation: Conduct operational testing under controlled conditions to validate performance in the actual application.

Application Scenarios

The JQ-QY33F is specifically designed for critical power switching applications in aerospace systems:

• Legacy Aircraft Systems Upgrade: Direct replacement for CA175 LEACH contactors in older commercial and military aircraft, extending system service life.
• Drone & UAV Power Management: Battery disconnect, motor controller power switching, and high-current payload control in unmanned systems.
• Aircraft Engine Systems: Starter motor circuits, generator field control, and auxiliary power unit (APU) switching.
• Avionics Power Distribution: Primary power switching for navigation, communication, and radar systems in both manned and unmanned aircraft.
• Ground Support Equipment: Power control in aircraft maintenance systems, test equipment, and ground power units.
• Military System Integration: Weapon system power control, electronic warfare system switching, and integration with other Military Aviation Connectors and components.

Value Proposition for Procurement & Maintenance Teams: The JQ-QY33F provides a cost-effective solution for obsolescence management, eliminating dependence on discontinued CA175 LEACH units. It offers improved reliability and consistent supply from a manufacturer with proven expertise in High Power Aviation Contactor systems and related components like Hydraulic Circuit Breakers and Aviation Magnetic Valves.

Certifications & Compliance

The JQ-QY33F is manufactured in facilities adhering to aerospace quality management systems and is designed to meet or exceed the performance specifications of the original CA175 LEACH contactor. Our production and testing protocols align with:

• Relevant MIL-STD specifications for environmental testing (vibration, shock, temperature)
• Aerospace industry standards for power switching components
• Form-fit-function replacement criteria for legacy system components
• RoHS compliance available upon request

We provide comprehensive documentation including test reports, material certifications, and compliance statements to support integration into certified aerospace platforms and maintenance programs.

Customization Options

While the JQ-QY33F is designed as a direct CA175 replacement, YM offers customization options for specific application requirements:

• Electrical Modifications: Custom coil voltages, alternative contact materials for specific load profiles
• Termination Variations: Different terminal styles, custom lead lengths, or integration with specific Military aircraft Plug systems
• Mechanical Adaptations: Alternative mounting configurations, custom orientation indicators, or special marking requirements
• Enhanced Testing Protocols: Additional qualification testing, extended burn-in, or specific environmental stress screening
• Identification & Traceability: Custom part numbering, serialization, date codes, or customer-specific labeling for maintenance tracking
• Packaging Solutions: Specialized packaging for maintenance kits, bulk packaging for MRO facilities, or ESD-protective packaging

Production & Quality Assurance Process

Each JQ-QY33F contactor undergoes a rigorous, documented manufacturing and testing regimen:

1. Material Selection & Qualification: Aerospace-grade materials are sourced from approved suppliers with full traceability
2. Precision Component Manufacturing: Critical components are produced to exacting tolerances using controlled processes
3. Automated Assembly: Consistent assembly using specialized fixtures ensures dimensional compatibility with CA175 units
4. Hermetic Sealing Process: Advanced sealing techniques followed by mandatory leak testing to verify environmental protection
5. 100% Electrical Testing: Every unit undergoes comprehensive testing including contact resistance, timing parameters, coil characteristics, and dielectric strength verification
6. Comparative Performance Testing: Batch units are tested against CA175 LEACH specifications to ensure equal or superior performance
7. Final Quality Audit: Complete dimensional and functional verification before protective packaging

This process reflects our commitment to quality across all product lines, from specialized Solid State Relays to complex Aviation Contactor for Aircraft systems.

Frequently Asked Questions (FAQ)

Q1: Is the JQ-QY33F truly a direct drop-in replacement for the CA175 LEACH contactor?

A1: Yes. The JQ-QY33F has been engineered to match the CA175 LEACH in all critical dimensions, mounting configurations, and electrical characteristics. It can be installed using existing hardware without system modifications, providing a seamless replacement solution.

Q2: What advantages does the JQ-QY33F offer over the original CA175 LEACH?

A2: While maintaining compatibility, the JQ-QY33F benefits from modern manufacturing techniques, potentially tighter performance tolerances, and assured supply availability. It's produced with the same quality standards as our New Energy Relays and other advanced components.

Q3: How does the hermetic sealing compare to the original CA175 units?

A3: The JQ-QY33F incorporates advanced sealing technologies that meet or exceed the original specifications. This ensures equivalent or better protection against environmental factors, similar to the sealing requirements for Aviation Oxygen Valves in life support systems.

Q4: What documentation is available to support maintenance and certification?

A4: We provide comprehensive technical data sheets, test reports, material certifications, and compliance statements. This documentation supports maintenance, repair, and overhaul (MRO) activities and can be used in support of continued airworthiness.

Q5: Can the JQ-QY33F be used in new system designs, or is it only for replacements?

A5: While designed as a replacement, the JQ-QY33F is fully suitable for new system designs requiring its specific performance characteristics. Its proven compatibility makes it a reliable choice for systems that may interface with existing CA175-based equipment.