Military Metal Relay JRC-7M RJ4.553.129

Product Overview

The JRC-7M RJ4.553.129-3 is a hermetically sealed, military‑grade Military Metal Relay designed for mission‑critical applications in drones, aircraft engines, trains, and defense electronics. This Metal Sealing Relay features a DPDT (2 Form C) contact configuration, ultra‑low coil power consumption (0.3–0.43W), and fast operate/release time (≤4ms). Its glass‑to‑metal sealed construction guarantees leakage ≤10⁻³ Pa·cm³/s, protecting internal contacts from moisture, fuel vapors, and altitude pressure changes. Rated for low‑level signal switching down to 10μA/10mV, the JRC‑7M is ideal for flight control interfaces, sensor multiplexing, and power distribution in military aircraft, UAVs, and ground support equipment. As a core product in YM’s Military Relay portfolio – which includes Polarized Relay, Latching Relay, PCB Board Relay, Automotive Relay, and Industrial Power Relay – the JRC‑7M delivers uncompromised reliability for the most demanding environments.

Technical Specifications

Coil Parameters (27V DC Nominal)

• Coil power consumption: (0.3–0.43)W – ultra‑low for a military DPDT relay
• Nominal coil voltage: 27V DC (compatible with 28V aircraft systems)
• Pick‑up voltage (max): 75% of nominal
• Drop‑out voltage (min): 10% of nominal
• Coil resistance (at 25°C): Approx. 1700–2400Ω (27V version)

Contact Ratings (DPDT – 2 Form C)

• Maximum switching current (resistive): 1A at 28V DC (reference test condition)
• Low level switching capability: (10–50)μA, (10–50)mV – 1×10⁵ operations, ideal for dry circuits
• Initial contact resistance: ≤50mΩ; after life test ≤200mΩ

Timing & Isolation

• Action time (operate): ≤4ms (typical ≤3ms)
• Release time: ≤4ms
• Dielectric strength (normal atmosphere): 500Vr.m.s., 50Hz between contacts and case; under low pressure: 250Vr.m.s.
• Insulation resistance (normal atmosphere): >500MΩ at 500V DC; after high‑level life test: >50MΩ

Mechanical & Environmental (Military Grade)

• Weight: <3g – ultra‑light for airborne use
• Sealing (leakage rate): ≤10⁻³ Pa·cm³/s (hermetic, glass‑to‑metal seal)
• Operating temperature range: -65°C to +125°C
• Shock & vibration: Withstands 50g, 6ms half‑sine; 10‑2000Hz, 20g random vibration per MIL‑STD‑810
• Terminal style: Solder hook or PCB through‑hole (gold‑plated, 8‑pin)

All parameters are validated at 25°C ambient. The JRC‑7M meets MIL‑PRF‑39016 requirements for hermetically sealed relays.

Product Images & Visuals

Above: JRC-7M series military relay (RJ4.553.129-3). Contact YM for dimensional outline, pin configuration, and environmental qualification reports.

Key Features & Advantages for Military & Aerospace Systems

• Hermetic metal sealing (≤10⁻³ Pa·cm³/s): Glass‑to‑metal seal protects against moisture, salt spray, fuel vapors, and altitude changes – ensures reliable operation in unpressurized aircraft bays and engine compartments. This level of protection is critical for Latching relay and Polarized Relay applications where contact contamination is unacceptable.
• Ultra‑low coil power (0.3–0.43W): Reduces heat generation and power supply load – ideal for battery‑backed avionics and long‑endurance drones.
• Fast switching (≤4ms) & high isolation: 500Vrms dielectric strength and >500MΩ insulation prevent crosstalk in mixed‑signal environments – essential for PCB Board Relay designs requiring high channel density.
• Wide temperature & vibration tolerance: -65°C to +125°C and 20g vibration meet RTCA/DO‑160 and MIL‑STD‑810 – suitable for fighter jets, helicopters, drones, and railway rolling stock.
• Excellent low‑level signal switching: Gold‑plated contacts reliably switch down to 10μA / 10mV – perfect for sensor multiplexing, avionics I/O, and mission computers.
• DPDT configuration (2 Form C): Two independent changeover contacts allow simultaneous switching of two circuits – reduces component count and saves PCB space in Industrial Power Relay and PCB Signal Relay applications.

YM’s engineering advantage: The JRC‑7M leverages advanced magnetic circuit technology from our Latching relay and Polarized Relay families, ensuring consistent contact force and minimal bounce. As a true Military Metal Relay, it outperforms commercial relays in hermeticity and vibration tolerance. For complete avionics and drone systems, YM also offers Aviation Microswitch, Aviation Rocker Switch, and Military Aviation Connector – a one‑stop solution for defense contractors.

How to Use the JRC-7M DPDT Military Relay – Step by Step

1. Identify pin configuration: The JRC‑7M has 8 pins (DPDT). Refer to the datasheet pinout diagram (coil pins, common, NO, NC for each pole).
2. Apply coil voltage: Connect +27V DC to the coil+ pin and ground to coil- pin. The relay will energize when voltage exceeds 20.25V (75% of nominal). For inductive loads, add a flyback diode across the coil.
3. Load connection: Connect your circuits to the common (C) and normally‑open (NO) or normally‑closed (NC) terminals of each pole. Typical use: signal routing or low‑power switching (≤1A).
4. Arc suppression (for inductive loads): For small solenoids or motors, install a snubber (RC network) across the load contacts to extend relay life.
5. PCB mounting: Solder the relay into a socket or directly onto the PCB. Use a heat sink during soldering (max 260°C for 5 seconds). Avoid flux ingress – use no‑clean flux.
6. Functional test: Apply coil voltage and measure contact resistance across each closed contact pair – should be ≤50mΩ. De‑energize and verify insulation >10MΩ between open contacts.

Pro tip for avionics integrators: For fail‑safe designs, use one pole to switch the main signal and the second pole to provide a status feedback to the flight computer – the DPDT configuration saves space and weight.

Application Scenarios & Key Buyer Benefits

Typical Military & Aerospace Applications

• Drone flight control computers: Discrete I/O expansion, autopilot mode selection, and payload release – lightweight and low power.
• Aircraft engine management: Fuel shutoff valves, ignition control, and overspeed protection – hermetically sealed for engine bay environment.
• Radar & electronic warfare (EW) systems: Signal routing and antenna switching – DPDT allows simultaneous switching of two independent channels.
• Railway & train control systems: Door actuators, lighting circuits, and brake monitoring – wide temperature range and vibration resistance.
• Ground support equipment (GSE): Battery charger contactors, power distribution, and test stands – durable for field use.

Direct Value to International Buyers (Defense OEMs, UAV Manufacturers, MROs)

• Reduced system power & thermal load: Low coil power (0.43W max) reduces heat generation – allows denser packaging in avionics LRUs.
• Lower lifecycle cost: Hermetic sealing eliminates contact oxidation failures – reduces field returns and unscheduled maintenance.
• Simplified logistics: DPDT configuration replaces two SPDT relays – reduces component count and inventory.
• Global compliance: MIL‑PRF‑39016 qualified, RoHS/REACH compliant, with AS9100D manufacturing – ready for FMS and direct defense contracts.

For new aircraft or drone programs, YM offers customization of coil voltages, contact materials, and screening levels. Engineering samples available for qualification testing.

Certifications & Compliance

• MIL-PRF-39016 (hermetic, signal relay) – qualification data available.
• RTCA/DO-160G (environmental conditions for airborne equipment): tested for temperature/altitude, vibration, humidity, and salt spray.
• MIL-STD-810G (environmental – shock, vibration, temperature extremes).
• ISO 9001:2015 & AS9100D certified manufacturing (aerospace quality management).
• RoHS & REACH compliant – full material declaration available.

Each JRC‑7M relay is 100% tested for coil resistance, pick‑up/drop‑out voltage, contact resistance (each pole), dielectric strength, and insulation resistance. Sample relays undergo destructive physical analysis (DPA) per MIL‑STD‑1580. Certificates of Conformance (CoC) and test data are provided with every shipment.

Customization Options

YM supports tailored JRC‑7M variants for specific military, aerospace, and industrial programs. Volume orders can include:

• Coil voltage: 5V, 12V, 24V, 28V, 48V DC – customized to match platform power buses.
• Contact material: Gold overlay (standard for low‑level), silver‑cadmium oxide (1A power), or rhodium (ultra‑low level).
• Terminal style & finish: Solder hook, straight DIP, or surface‑mount; gold or tin plating.
• Screening level: Commercial (standard), high‑reliability (100% burn‑in, temperature cycling), or space‑level (DPA, radiation testing).
• Marking: Laser engraving of customer part number, date code, or inspection stamp.

Our engineering team provides application support, including thermal derating curves, driver circuit recommendations, and SPICE models. Minimum order quantities for custom variants apply – contact YM with your requirements.

Production Process & Quality Assurance (AS9100D Certified)

YM’s military relay production line follows a zero‑defect, fully traceable process designed to meet the most stringent requirements for aerospace and defense programs.

• Raw material control: 100% verification of magnetic alloys, contact wires, glass preforms, and metal cans – all from approved aerospace suppliers with COC and batch traceability.
• Coil winding & encapsulation: Precision winding with automated tension control; vacuum encapsulation using low‑outgassing epoxy.
• Contact assembly in Class 100 cleanroom: Alignment of DPDT contacts under 40x microscope; dynamic contact force testing to ensure ≤50mΩ initial resistance.
• Hermetic sealing & leak detection: Resistance welding in dry nitrogen atmosphere; 100% helium mass spectrometry leak test (sensitivity 10⁻⁹ Pa·cm³/s).
• Environmental screening (100% for high‑rel lots): Thermal shock (-65°C to +125°C, 10 cycles), constant acceleration (10,000g), and burn‑in (168 hours at 125°C with periodic operation).
• Final electrical test: Automated test system (ATS) measures all parameters per MIL‑PRF‑39016.
• Destructive Physical Analysis (DPA): One unit per lot cross‑sectioned per MIL‑STD‑1580 for internal workmanship.

With decades of experience in Metal Sealing Relay and PCB Signal Relay production, YM has supplied relays to major defense contractors and aerospace primes. The JRC‑7M is built to exceed the reliability expectations of next‑generation military aircraft, drones, and high‑speed trains.