Military Civil Switch KA1-1 – Dual-Use High Performance Switching for Aviation & Defense
The Military Civil Switch KA1-1 is a versatile, high‑performance sealed switch engineered to meet the demanding requirements of both military and civil aviation platforms. Featuring a rugged metal housing, gold‑plated bifurcated contacts, and ultra‑low coil power consumption (0.3~0.43 W), the KA1‑1 delivers reliable switching for cockpit controls, avionics, communication systems, and ground support equipment. Whether you need a durable solution for aircraft rocker switches applications or a Military Grade Switch for harsh environments, the KA1‑1 combines military‑grade sealing with civil certification readiness. As part of YM brand’s comprehensive family – which also includes Aviation Rocker Switch with military grade, certified aircraft rocker switches, and military grade rotary switches – the KA1‑1 offers a cost‑effective, reliable choice for global OEMs and MROs.
Technical Specifications
The KA1‑1 Military Civil Switch is manufactured to meet rigorous aerospace and military performance criteria. Key parameters include:
- Coil Power Consumption: 0.3 ~ 0.43 W (at 25°C nominal voltage)
- Contact Load & Electrical Life: Resistive load 1 A @ 28 V d.c., 1×10⁵ operations; low‑level (10~50) μA, (10~50) mV, 1×10⁵ operations
- Contact Resistance: Initial ≤50 mΩ; after life test ≤200 mΩ
- Operate / Release Time: ≤4 ms (operate), ≤4 ms (release); high‑speed option ≤3 ms action time
- Incentive Pulse Width: (10~50) ms
- Dielectric Withstanding Voltage: Normal atmosphere: 500 Vr.m.s. @ 50 Hz; reduced pressure: 250 Vr.m.s. @ 50 Hz
- Insulation Resistance: Normal atmosphere >500 MΩ; after high‑level life test >50 MΩ
- Weight: <3 g (ultra‑light for airborne equipment)
- Sealing (Leakage Rate): ≤1×10⁻³ Pa·cm³/s (helium mass spectrometer tested)
- Wire Coil Specifications: 28 V d.c. standard; other voltages (5 V, 12 V, 24 V) available on request
- Operating Temperature Range: -65°C to +125°C
- Vibration Resistance: 10 g, 10~2000 Hz (MIL‑STD‑202 Method 204)
- Shock Resistance: 50 g, 11 ms half‑sine (MIL‑STD‑202 Method 213)
- Switch Type: Push‑button (momentary or latching) – also configurable as band selector
These specifications make the KA1‑1 ideal for applications requiring military rocker switches or aircraft grade toggle switches. The low contact resistance and hermetic sealing ensure trouble‑free operation in unpressurized aircraft bays, engine compartments, and external stores.
Product Images & Visuals
High‑resolution images showcase the rugged metal enclosure, tactile actuator, and gold‑plated terminals. Outline drawings, PCB footprints, and 3D STEP models are available upon request.
Key Features & Advantages
Compared to standard commercial switches, the KA1‑1 offers distinct benefits for dual‑use (military/civil) Aviation Applications:
- Hermetic Metal Sealing (≤1×10⁻³ Pa·cm³/s): Prevents ingress of moisture, fuel vapors, salt fog, and sand – essential for both military field operations and civil regional aircraft. This sealing technology is also applied in our aviation switch with military grade and protect switch product lines.
- Ultra‑Low Coil Power (0.3 W typical): Minimizes heat rise in avionics racks and enables direct drive from 28 V logic outputs without external drivers – a key requirement for modern aviation encoding switch 28v systems.
- Fast & Consistent Switching (≤4 ms): Enables precise timing for arming sequences, mode selection, and fault protection circuits.
- Gold‑Plated Bifurcated Contacts: Maintain stable contact resistance (<50 mΩ) over 100,000 operations, supporting both power (1 A) and low‑level (10 μA) signals – ideal for static encoder aviation feedback loops.
- Wide Temperature Range (-65°C to +125°C): Operates reliably in extreme climatic conditions from arctic to desert without performance degradation.
- High Vibration & Shock Tolerance: Tested to 10 g vibration and 50 g shock, exceeding DO‑160G requirements for both helicopter and fixed‑wing platforms.
- Dual-Use Certification: Qualified for both military (MIL‑PRF‑8805) and civil (RTCA DO‑160G) applications, reducing qualification costs for hybrid programs.
How to integrate the KA1‑1 into your system:
Step 1: Select the appropriate actuator style (push‑button momentary or latching) and contact configuration (SPST, SPDT, or multi‑position).
Step 2: Mount the switch using the threaded bushing (M9×0.75 standard) or optional flange. Torque to 2 N·m.
Step 3: Solder or crimp wires to the gold‑plated terminals – do not exceed 260°C for 5 seconds.
Step 4: For coil‑operated versions, connect the 28 V d.c. supply (observe polarity if diode‑protected).
Step 5: Perform a functional test: actuate the switch and verify contact resistance (<50 mΩ) and tactile feedback.
By choosing YM brand’s KA1‑1, you benefit from reduced lifecycle costs (hermetic sealing eliminates contact cleaning) and improved system availability. Our quality processes also produce aviation encoder and gx Aviation Connector components, ensuring consistency across your entire control panel design.
Application Scenarios
The KA1‑1 Military Civil Switch is widely deployed in the following aerospace and defense applications:
- Cockpit control panels (civil & military): Master caution reset, lighting control, autopilot mode selection, and radio frequency band switching.
- Avionics cooling and monitoring systems: Fan speed control and sensor power switching.
- Weapon control systems (military): Arm/safe selection and jettison enable – fully compatible with army aviation roc‑v requirements.
- Ground support equipment (GSE): Test bench function selection, battery charger controls, and hydraulic pump enable.
- Unmanned aerial vehicles (UAV) ground stations: Mode selection and emergency stop circuits.
- Helicopter utility panels: Where aircraft swing arm switch or aviation button switch alternatives are used, the KA1‑1 provides a compact, sealed solution.
For procurement engineers, the KA1‑1 reduces inventory complexity – one switch type serves multiple functions across different airframes and can be used in both military and civil fleets. Its long electrical life (100,000 cycles) lowers total cost of ownership, and the hermetic design eliminates failures due to humidity and sand/dust, common in desert or carrier operations. Additionally, the KA1‑1 can be directly integrated with aviation encoding switch with military grade and military rocker switch based systems for digital position feedback.
Certifications & Compliance
The KA1‑1 is designed and tested to meet the following international military and civil aerospace standards:
- AS9100D certified manufacturing facility (YM brand)
- MIL-PRF-8805/4 (General specification for hermetically sealed switches, military grade)
- RTCA DO-160G (Sections 4, 5, 8, 11 – temperature, altitude, vibration, fluid susceptibility for civil certification)
- MIL-STD-202 (Environmental test methods: vibration, shock, salt spray, altitude, moisture)
- MIL-DTL-83731 (Toggle and pushbutton switches, general specification)
- RoHS 3 (2015/863/EU) and REACH compliant (with approved aerospace exemptions)
- CE marked for civil equipment use (EMC and Low Voltage Directive)
Each KA1‑1 switch is serialized and accompanied by a Certificate of Conformance (CoC) with detailed test data: contact resistance, insulation resistance, dielectric strength, coil resistance, and helium leak rate. First Article Inspection (FAI) reports per AS9102 are available for program qualification.
Customization Options
To accommodate the diverse needs of both military and civil aviation programs, YM brand offers extensive customization for the KA1‑1 platform:
- Actuator Type & Color: Push‑button (momentary or latching) or rotary band selector (2 to 6 positions); custom colors and laser‑engraved legends (e.g., “ON/OFF”, “BAND 1-4”, “ARM”, “TEST”).
- Contact Configuration: SPST, SPDT, DPST, DPDT, or multi‑position (up to 6 throws).
- Terminal Style: Solder lug (standard), PCB pin, 0.110” or 0.187” quick‑connect, or wire leads with gx aviation connector pre‑assembly.
- Coil Voltage: 5 V, 12 V, 24 V, 28 V d.c., or 115 V 400 Hz a.c. (for dry circuits).
- Contact Material: Gold‑plated silver (standard); optional gold‑plated palladium for ultra‑low level (<10 mV) switching.
- Sealing Upgrade: Leak rate ≤1×10⁻⁵ Pa·cm³/s for space or high‑altitude long‑endurance platforms.
- Mounting Hardware: Standard M9×0.75 bushing, or custom lengths for varying panel thicknesses.
Our engineering team provides 2D outline drawings, 3D CAD models (STEP/IGES), and application notes. For large‑scale MRO or OEM contracts, we can co‑design a variant optimized for your aircraft rocker switch or military wave switch 28V 10A system architecture.
Production Process & Quality Assurance
Every KA1‑1 Military Civil Switch undergoes a rigorous 10‑step manufacturing and testing protocol to ensure zero defects:
- Precision stamping of contact springs and terminals from beryllium copper or silver alloy.
- Selective gold plating of contact surfaces (thickness ≥0.5 μm) in a controlled bath.
- Coil winding with high‑temperature Class H magnet wire – 100% tested for resistance and turn‑to‑turn insulation.
- Contact & armature assembly in an ISO Class 7 cleanroom to prevent particle contamination.
- Resistance welding of the metal enclosure under dry nitrogen purge.
- Helium mass spectrometer leak test – each unit must achieve ≤1×10⁻³ Pa·cm³/s.
- 100% electrical testing (operate/release voltage, contact resistance, insulation resistance, dielectric strength).
- Burn‑in cycling – 50 operations at rated load for every switch.
- Vibration & shock sample testing per MIL‑STD‑202 (5 units per batch).
- Final visual inspection under 20x magnification and laser marking of part number, date code, and YM brand logo.
Our factory is IATF 16949 certified and applies statistical process control (SPC) to critical dimensions. This same quality system governs our entire line of micro switch, inches switch, and press switch products, ensuring the KA1‑1 meets the highest expectations for safety and reliability in both military and civil aviation.
Contact Now