Structured Manufacturing Data (2026)

Circuit Breaker / Fuse Holder

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Circuit Breaker / Fuse Holder used in the Electrical Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Circuit Breaker / Fuse Holder is characterized by the integration of Contact Clips/Terminals and Housing/Base. In industrial production environments, manufacturers listed on CNFX commonly emphasize Thermoset Plastic (e.g., Polycarbonate, PBT) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A protective device housing that secures and connects circuit breakers or fuses within a Power Distribution Unit (PDU) to interrupt electrical circuits during overloads or faults.

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Product Specifications

Technical details and manufacturing context for Circuit Breaker / Fuse Holder

Definition
The Circuit Breaker/Fuse Holder is a critical safety component within a Power Distribution Unit (PDU) designed to securely mount and electrically connect circuit breakers or cartridge fuses. It provides the mechanical interface and electrical contacts necessary for these protective devices to function, allowing them to detect abnormal current conditions (overloads or short circuits) and safely interrupt the circuit to prevent damage to downstream equipment and wiring. The holder ensures proper alignment, thermal management, and reliable electrical connection for consistent protection.
Working Principle
The holder provides a fixed mounting point with conductive terminals (typically made of copper alloy) that connect the circuit breaker or fuse in series with the electrical circuit. When a fault occurs, the internal mechanism of the circuit breaker trips, or the fuse element melts, breaking the circuit. The holder maintains the physical and electrical integrity of this connection point before, during, and after the interruption event, often incorporating features like arc chutes (for breakers) or indicator windows (for fuses) to enhance safety and monitoring.
Common Materials
Thermoset Plastic (e.g., Polycarbonate, PBT), Copper Alloy (Contacts), Steel (Mounting Hardware)
Technical Parameters
  • Rated current of the compatible circuit breaker or fuse (e.g., 16A, 32A). (A) Standard Spec
Components / BOM
  • Contact Clips/Terminals Part
    Provide secure electrical connection to the breaker/fuse blades and the busbar or wiring.
    Material: Copper alloy (e.g., brass, phosphor bronze)
  • Housing/Base Part
    Insulates and structurally supports all internal components, providing mounting points.
    Material: Thermoset plastic (e.g., Polycarbonate for impact resistance, PBT for heat resistance)
  • Mounting Clip/Latch Part
    Secures the holder to a DIN rail or panel; may include a release mechanism for removal.
    Material: Stainless steel or spring steel
  • Arc Chamber/Barrier Part
    (For breaker holders) Contains and extinguishes arcs generated during circuit interruption.
    Material: Arc-resistant plastic or ceramic

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Circuit Breaker / Fuse Holder.

PDU circuit breaker holder industrial fuse housing thermoset plastic fuse holder copper alloy contact clips arc barrier circuit breaker mount

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Power Distribution Unit
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar (typical enclosure rating)
other spec: Current rating: 0.5A to 800A, Voltage rating: up to 600V AC/DC, Interrupting capacity: 10kA to 200kA
temperature: -40°C to +85°C (operating), -55°C to +125°C (storage)
Media Compatibility
✓ Copper busbars ✓ Aluminum conductors ✓ Insulating gases (SF6, air, vacuum)
Unsuitable: Corrosive/conductive atmospheres (e.g., salt spray, acid mists)
Sizing Data Required
  • Maximum continuous current (Amps)
  • System voltage (Volts AC/DC)
  • Required interrupting capacity (kA)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Contact Arcing and Pitting
Cause: Electrical arcing during operation due to poor contact alignment, contamination, or excessive current, leading to surface degradation and increased resistance.
Thermal Overload and Melting
Cause: Excessive current exceeding rated capacity, poor electrical connections causing localized heating, or environmental overheating, resulting in component deformation or failure.
Maintenance Indicators
  • Visible discoloration, scorch marks, or melting on the housing or contacts
  • Audible buzzing, crackling, or intermittent arcing sounds during operation
Engineering Tips
  • Implement regular infrared thermography inspections to detect abnormal heating patterns before failure occurs
  • Ensure proper torque specifications are maintained on all electrical connections and perform periodic contact resistance testing

Compliance & Manufacturing Standards

Reference Standards
IEC 60947-2 (Circuit-breakers) UL 489 (Molded-Case Circuit Breakers) EN 60269-1 (Low-voltage fuses)
Manufacturing Precision
  • Contact gap: +/-0.1mm
  • Terminal flatness: 0.05mm
Quality Inspection
  • Dielectric withstand test (Hi-Pot)
  • Contact resistance measurement

Factories Producing Circuit Breaker / Fuse Holder

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are used in this circuit breaker holder for durability?

Constructed with thermoset plastic (polycarbonate/PBT) housing for heat resistance, copper alloy contacts for conductivity, and steel mounting hardware for secure installation.

How does this fuse holder provide overload protection in PDUs?

The housing securely positions circuit breakers or fuses with contact clips that interrupt electrical flow during overloads or faults, while the arc chamber contains potential electrical arcs.

What components are included in the BOM for installation?

Complete BOM includes contact clips/terminals for connections, housing/base for protection, mounting clip/latch for secure placement, and arc chamber/barrier for safety.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Electrical Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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