---
title: "Door Interlock Switch"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:DOOR_INTERLOCK_SWITCH"
  data_integrity_hash: "ba26208f85dad2e3cc23a15dae7cce05"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:DOOR_INTERLOCK_SWITCH"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/door-interlock-switch.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/door-interlock-switch"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-2.5 mm actuator displacement, 24V DC ±10% supply voltage, -25°C to +85°C ambient temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 3.0
    unit: "mm"
    consequence: "Mechanical fatigue from cyclic loading at &gt;10⁶ cycles causes spring failure, dielectric breakdown at &gt;500V/mm in switch contacts causes arcing, thermal expansion mismatch between stainless steel actuator and ABS housing creates &gt;0.1 mm gap at temperature extremes"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Corrosive atmosphere with &gt;80% relative humidity and chloride concentration &gt;100 ppm"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Gold-plated contacts (5 μm thickness) with IP67 sealed enclosure using nitrile rubber gaskets"
  - node_2:
      trigger: "Mechanical shock &gt;50g acceleration for &gt;2 ms duration during transport or installation"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Shock-absorbing mounting with silicone dampeners having 70 Shore A hardness and vibration isolation &gt;15 Hz natural frequency"
bom_nodes:
  actuator-head:
    type: "part"
    urn: "URN:CNFX:ME:ACTUATOR_HEAD"
    interface_type: "physical-logic-coupled"
  switch-body:
    type: "component"
    urn: "URN:CNFX:ME:SWITCH_BODY"
    interface_type: "physical-logic-coupled"
  electrical-contacts:
    type: "component"
    urn: "URN:CNFX:ME:ELECTRICAL_CONTACTS"
    interface_type: "physical-logic-coupled"
  spring-mechanism:
    type: "component"
    urn: "URN:CNFX:ME:SPRING_MECHANISM"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/door-interlock-switch.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "6cbf4d366b4eee5d36d35b770cfc4327ed8ae70fa53936bac124792e6698a451"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Door Interlock Switch

## 1. Technical Definition
A safety device that prevents machinery operation when access doors or guards are open

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-2.5 mm actuator displacement, 24V DC ±10% supply voltage, -25°C to +85°C ambient temperature**. Failure boundary: **Actuator displacement &gt;3.0 mm causes permanent mechanical deformation, supply voltage &gt;28V DC damages internal electronics, ambient temperature &gt;100°C melts thermoplastic housing**, Mechanism: **Mechanical fatigue from cyclic loading at &gt;10⁶ cycles causes spring failure, dielectric breakdown at &gt;500V/mm in switch contacts causes arcing, thermal expansion mismatch between stainless steel actuator and ABS housing creates &gt;0.1 mm gap at temperature extremes**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Corrosive atmosphere with &gt;80% relative humidity and chloride concentration &gt;100 ppm | 8 | Contact resistance increases from &lt;0.1 Ω to &gt;10 Ω within 1000 operating cycles | Gold-plated contacts (5 μm thickness) with IP67 sealed enclosure using nitrile rubber gaskets |
| Mechanical shock &gt;50g acceleration for &gt;2 ms duration during transport or installation | 8 | Internal spring permanent set reduces actuation force from 5N to &lt;1N | Shock-absorbing mounting with silicone dampeners having 70 Shore A hardness and vibration isolation &gt;15 Hz natural frequency |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Actuator Head](https://cnfx.com/llms/industry/electrical-equipment-manufacturing/product/actuator-head.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Safety Relay Module**, **Programmable Logic Controller (PLC)**, **Emergency Stop Button**  
**Downstream Applications**: Industrial Machinery, Packaging Equipment, Material Handling Systems  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the purpose of a door interlock switch in machinery?
**A**: A door interlock switch is a safety device that prevents machinery from operating when access doors, panels, or guards are open, protecting operators from hazardous moving parts during maintenance or inspection.

### Q: What materials are used in this door interlock switch and why?
**A**: This switch features a stainless steel housing for corrosion resistance and durability, copper contacts for reliable electrical conductivity, and a polycarbonate actuator for impact resistance and clear visibility of the switch position.

### Q: How does the spring mechanism in the door interlock switch work?
**A**: The spring mechanism ensures positive contact engagement when the door is closed and automatic disengagement when opened, providing fail-safe operation that interrupts power to machinery controls when access is detected.

## 6. Manufacturing Compliance

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### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Door Interlock Switch](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/door-interlock-switch)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: DOOR_INTERLOCK_SWITCH | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: de2ecb10
