Postek (HK) Co., Limited  |  HK Series  |  Datasheet

Postek (HK) Co., Limited | HK Series

Postek (HK) Co., Limited | HK Series | 8 Model Variants

1. Product Overview

The HK-KWQM4-4Z is a hermetically sealed snap-action micro switch featuring welded metal shell construction. Designed and qualified for high-reliability applications, it delivers exceptional EMI shielding, total ionizing dose tolerance up to 100 Krad(Si), and continuous operation across an extreme temperature range from -184°C to +260°C. The changeover (SPDT) circuit configuration with solder termination makes it suitable for mission-critical electronic and electrical systems.

Key Features

Applications

2. Technical Specifications

2.1 Electrical Ratings by Model

ModelDC VoltageResistive LoadInductive LoadAC (400Hz)Temperature Range
HK-KWQM4-4Z28V DC5A3A115V AC / 2A-184°C ~ +125°C
HK-KWQM4-4Z-128V DC4A1A115V AC / 2A-65°C ~ +125°C
HK-KWQM4-4Z-5-1E28V DC4A2A115V AC / 2.5A-184°C ~ +260°C
HK-KWQM4-4Z-5-1J28V DC4A——-65°C ~ +260°C
HK-KWQM4-4Z-9-1C28V DC0.5A0.25A—-184°C ~ +121°C
HK-KWQM4-4Z-9-1F28V DC0.5A——-65°C ~ +125°C
HK-KWQM4-4Z-11-1A28V DC3A1A115V AC / 1A-184°C ~ +121°C
HK-KWQM4-4Z-11-1G28V DC3A——-65°C ~ +125°C

2.2 Mechanical Specifications

ParameterValue
Operating Force≤ 1.95 N
Release Force≥ 0.28 N
Operating Stroke≤ 0.76 mm
Differential Stroke≤ 0.15 mm
Electrical Life10,000 cycles
Seal Leakage Rate≤ 1×10⁻³ Pa·cm³/s

2.3 Environmental Specifications

ParameterValue
Sine Vibration10~2000 Hz, 15g
Random Vibration10 (m/s²)²/Hz, 119.5 m/s² RMS
Shock100g
Humidity10 days
Salt Spray96 hours
Radiation (Total Dose)100 Krad(Si)
Contact Bounce≤ 1 ms

3. Quality Grades & Standards

Quality GradeDetail Specification
Military Grade (J/Z)Q/MA20347/Z-2019
Space GradeYHYB S1201/001-2013
CAST GradeCASTPS04/026-2018
Type SpectrumQ/MA30016-2019
ConformityZZR-Q/MA20433-2019

4. Model Number Nomenclature

FieldCodeDescription
Main TypeKWMicro Switch
SealingQMHermetically Sealed
Body4Body configuration code
Actuator4ZLeaf spring actuator with specified geometry
Electrical CodeN / M / E / J / C / F / A / GLoad rating variant

Circuit State: Z = Changeover (SPDT), T = Normally Open (NO), D = Normally Closed (NC)

5. Dimensions & Drawings

Dimension Drawing
Figure 1: Dimension Drawing (mm) — Tolerance GB/T1804-c
Circuit Diagram
Figure 2: Circuit Diagram — SPDT Changeover (C/NC/NO)
Mounting Drawing
Figure 3: Mounting Configuration — 2× M2 Φ2.2mm

6. Installation & Application Guide

6.1 Installation

  1. Mounting: Secure with 2× M2 screws through Φ2.2mm holes. Torque ≤ 0.16 N·m. Use mounting washer for reliable clamping.
  2. Wiring: Solder termination. Ensure connections comply with rated load specifications.

6.2 Position Adjustment

  1. Free State: Actuator must NOT contact the push button. Circuit state: C-NC closed, C-NO open.
  2. Actuated State: Apply vertical force ≥ 1.95N at PT + 2/3 OT position. Circuit state: C-NC open, C-NO closed.
  3. Maximum Force: Do not exceed 40N on actuator arm.

6.3 Precautions

7. Actuator Accessories

AccessoryTypeApplication
HK-ACC-025Roller ActuatorInitial position: 18.1~18.5 mm
HK-ACC-183Support PlateInitial position: 14.5~15.3 mm
HK-ACC-203Support PlateInitial position: 12.0~12.6 mm
HK-ACC-273Support PlateInitial position: 13.8~14.6 mm

8. Downloads

📥 Download Datasheet (PDF)

9. Request Quote

Need Pricing or Technical Consultation?

MOQ 50-200 pcs. Samples available. 7-15 day lead time.

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Postek (HK) Co., Limited — Hong Kong

Postek (HK) Co., Limited — Hong Kong  |  sales@milconnectorspro.com  |  t.me/hkpostek