---
title: "Contact Assembly"
industry: "Electrical Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CONTACT_ASSEMBLY"
  data_integrity_hash: "2ed54543c690122aa8d39dbf5567263c"
  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:CONTACT_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/electrical-equipment-manufacturing/product/contact-assembly.md"
  official_resource_url: "https://cnfx.com/industry/electrical-equipment-manufacturing/product/contact-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-150°C ambient temperature, 0.1-30A current rating, 120-600V AC voltage rating"
    unit: "A, V"
engineering_limits:
  max_safe_operating_point:
    value: 800
    unit: "°C"
    consequence: "Thermal expansion mismatch between bimetallic elements (coefficient difference 15×10⁻⁶/°C) causes mechanical stress exceeding 350MPa yield strength, leading to contact misalignment and arcing"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Inrush current exceeding 10× rated current during compressor startup"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Current-limiting NTC thermistor with 5Ω cold resistance placed in series with contact assembly"
  - node_2:
      trigger: "Ambient temperature cycling between -40°C and 125°C at 2 cycles/hour"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Finite element analysis-optimized bimetallic geometry with 0.2mm radius fillets at stress concentration points"
bom_nodes:
  movable-contact:
    type: "component"
    urn: "URN:CNFX:ME:MOVABLE_CONTACT"
    interface_type: "physical-logic-coupled"
  stationary-contact:
    type: "component"
    urn: "URN:CNFX:ME:STATIONARY_CONTACT"
    interface_type: "physical-logic-coupled"
  contact-spring:
    type: "component"
    urn: "URN:CNFX:ME:CONTACT_SPRING"
    interface_type: "physical-logic-coupled"
  contact-arm-carrier:
    type: "component"
    urn: "URN:CNFX:ME:CONTACT_ARM_CARRIER"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/electrical-equipment-manufacturing/product/contact-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "5730740c66be3043bd9a23b7fd592aa163988f36964a8c3b024fbdf4f293ebe4"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Contact Assembly

## 1. Technical Definition
A critical electrical switching component within a thermal overload protector that makes or breaks the circuit to the compressor motor based on temperature conditions.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-150°C ambient temperature, 0.1-30A current rating, 120-600V AC voltage rating**. Failure boundary: **Contact welding occurs at 800°C contact interface temperature, contact erosion exceeds 0.5mm material loss, insulation breakdown at 2.5kV dielectric strength**, Mechanism: **Thermal expansion mismatch between bimetallic elements (coefficient difference 15×10⁻⁶/°C) causes mechanical stress exceeding 350MPa yield strength, leading to contact misalignment and arcing**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Inrush current exceeding 10× rated current during compressor startup | 8 | Contact welding due to instantaneous temperature rise above 1200°C at contact interface | Current-limiting NTC thermistor with 5Ω cold resistance placed in series with contact assembly |
| Ambient temperature cycling between -40°C and 125°C at 2 cycles/hour | 8 | Bimetallic element fatigue fracture after 100,000 cycles due to stress concentration at mounting points | Finite element analysis-optimized bimetallic geometry with 0.2mm radius fillets at stress concentration points |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Automatic Assembly Machine**, **Laser Welding System**, **Electrical Testing Station**  
**Downstream Applications**: Thermal Overload Protectors, Motor Protection Relays, Compressor Control Units  

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

### Q: What materials are used in these contact assemblies for optimal performance?
**A**: Our contact assemblies feature silver alloy contacts (AgCdO or AgSnO2) for superior conductivity and arc resistance, copper alloy carriers, spring steel for consistent pressure, and thermoset plastic housings for insulation and durability in demanding electrical environments.

### Q: How does this contact assembly function within a thermal overload protector?
**A**: The contact assembly serves as the critical switching mechanism that opens or closes the circuit to the compressor motor based on temperature. When overheating occurs, the thermal element triggers the movable contact to separate from the stationary contact, breaking the circuit to prevent motor damage.

### Q: What are the key components in this contact assembly BOM?
**A**: The complete assembly includes: contact arm/carrier (supports movable contact), contact spring (provides consistent pressure), movable contact (attached to arm), and stationary contact (fixed position). These components work together to ensure reliable electrical switching throughout the protector's lifespan.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Contact Assembly](https://cnfx.com/industry/electrical-equipment-manufacturing/product/contact-assembly)**

### 🌐 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**: CONTACT_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 8b89c410
