KAN427 Series Illuminated Pushbutton Switch
2Z Changeover · Built-in LED · GJB1512A-2011 Qualified
The KAN427 series integrates an operator actuator, LED indicator, and 2Z changeover switching mechanism in a single sealed assembly. Two independent control circuits enable separate circuit switching for aerospace cockpit panels, industrial control consoles, and high-reliability HMI applications.
1. Product Overview
The KAN427 series illuminated pushbutton switch features an axial linear-drive actuator and bow-spring switching mechanism. Two independent control circuits can separately switch two circuit groups. In the normal (rest) position, both control circuits conduct; when actuated, they transfer to the alternate state.
Key Features:
- 2Z (2-pole changeover) switching unit, dual independent circuit control
- Built-in LED indicator (voltage-drive or current-drive)
- Solder-terminal connections
- Dual-screw clamp mounting
- Bow-spring mechanism for reliable switching
2. Technical Specifications
2.1 Electrical Performance
| Parameter | Test Condition | Specification |
|---|---|---|
| Contact Resistance | Instrument measured | ≤ 0.025 Ω |
| Insulation Resistance | Instrument measured | ≥ 1,000 MΩ |
| Dielectric Withstand | Instrument measured | 1,000 V AC |
| Contact Bounce | Instrument measured | ≤ 5 ms |
| Electrical Life | Rated load | 25,000 cycles |
| Mechanical Life | No load | 50,000 cycles |
2.2 Mechanical & Environmental
| Parameter | Test Condition | Specification |
|---|---|---|
| Actuation Force | Measured | 6 N ~ 30 N |
| Full Travel | Measured | ≤ 6 mm |
| Vibration | 10–500 Hz | 10g |
| Shock | 11 ms half-sine | 50g |
| Temperature Range | — | -55°C to +85°C |
| Humidity | 40°C, 93±3% RH | 10 days |
| Salt Spray | — | 96 h |
| Low Pressure | — | 11.59 kPa |
2.3 Model Number Nomenclature
KAN427 — ① — ② — ③ — ④
| Position | Meaning | Options |
|---|---|---|
| ① | Action Type | A Momentary, B Alternate |
| ② | Switch Units | 2Z 2 changeover poles, 4Z 4 changeover poles |
| ③ | Lens Color | W Milky White, G Green, R Red, Y Yellow |
| ④ | Indicator | GV Voltage-drive Green, GI Current-drive Green |
3. Model Variants
| No. | Model | Action | Poles | Indicator | Quality Grade |
|---|---|---|---|---|---|
| 1 | KAN427-A-2Z-W-GV | Momentary | 2Z | Voltage Green | Standard / YC |
| 2 | KAN427-A-2Z-W-GI | Momentary | 2Z | Current Green | Standard / YC |
| 3 | KAN427-A-4Z-W | Momentary | 4Z | None | Standard / YC |
| 4 | KAN427-B-2Z-W-GV | Alternate | 2Z | Voltage Green | Standard / YC |
| 5 | KAN427-B-2Z-W-GI | Alternate | 2Z | Current Green | Standard / YC |
| 6 | KAN427-B-4Z-W | Alternate | 4Z | None | Standard / YC |
4. Engineering Drawings
Panel Cutout: 17.5 mm × 17.5 mm
Terminal Assignment:
- Free state: ⑧-⑤, ⑩-⑦ conducting
- Actuated: ⑧-①, ⑩-④ conducting
- ①④⑤⑦⑧⑩: Switch circuit terminals
- ②③⑥⑨⑪⑫: LED indicator terminals (illuminated models only)
5. Quality Standards & Certifications
| Grade | Standard | Description |
|---|---|---|
| Standard (普军级) | Q/MA 20306-2014 | Industrial-grade quality |
| YC (七专级) | Q/QJA 20122/6-2018 | Aerospace-grade QC |
| General Spec | GJB1512A-2011 | Pushbutton Switch General Specification |
6. Installation
- Remove outer sleeve → grip actuator recess with thumb and forefinger → gently pull out actuator
- Insert switch from panel front into 17.5 × 17.5 mm cutout
- Select outer sleeve per panel thickness → install from bottom → use flat screwdriver to adjust mounting cam
- Tighten mounting screw (torque ≤ 0.15 N·m) → apply thread-locking compound
7. Applications
- Aviation Instruments — Cockpit control panel status indication
- Aerospace Equipment — High-reliability circuit transfer and control
- Industrial Control — Premium console HMI panel operation
- Marine Equipment — Navigation and communication system control
8. FAQ
KAN427 vs KAN389 — what's the difference?
KAN427 has 2Z (2-pole changeover) switching units; KAN389 has 4Z (4-pole). KAN427 provides two independent control circuits for split-control applications. Both comply with GJB1512A-2011.
Does KAN427-A-4Z-W include an LED indicator?
No — models without GV or GI suffix omit the indicator. For illuminated variants, choose KAN427-A-2Z-W-GV (voltage-drive) or KAN427-A-2Z-W-GI (current-drive).
Voltage-drive vs current-drive — how to choose?
- Voltage-drive (GV): Direct voltage operation, ideal for regulated DC supplies
- Current-drive (GI): Current-regulated brightness, handles supply voltage variation better
9. Design Resources
| Resource | Format | Access |
|---|---|---|
| Product Datasheet | HK-KAN427.pdf | |
| 3D Model (STEP) | On Request | Contact Engineering |
| Installation Guide | Contact Sales |
📚 Related Technical Articles
- Illuminated Pushbutton Switches for Aerospace Cockpit Panels → — Selection and integration guide for KAN series
- Capacitive Touch Switching for Harsh Environments → — Long-life alternatives to mechanical contacts
- How to Prevent Contact Failure Under High Vibration → — Vibration resistance in pushbutton mechanisms