Industry-Verified Manufacturing Data (2026)

Circuit Breaker / Fuse Holder

Based on aggregated insights from multiple verified 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
    Provide secure electrical connection to the breaker/fuse blades and the busbar or wiring.
    Material: Copper alloy (e.g., brass, phosphor bronze)
  • Housing/Base
    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
    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
    (For breaker holders) Contains and extinguishes arcs generated during circuit interruption.
    Material: Arc-resistant plastic or ceramic
Engineering Reasoning
0.1-100 A continuous current, 120-600 V AC/DC voltage rating, -40°C to +85°C ambient temperature
Contact resistance exceeding 50 mΩ, insulation breakdown at 2.5 kV RMS, thermal runaway at 125°C internal temperature
Design Rationale: Arcing erosion at 3000°C plasma temperature during interruption, thermoplastic deformation at glass transition temperature (Tg) of 150°C for housing polymers, electromigration at current densities exceeding 10^6 A/cm²
Risk Mitigation (FMEA)
Trigger Transient overcurrent exceeding 10× rated current for 100 ms
Mode: Contact welding due to joule heating (Q=I²Rt) exceeding 500 J
Strategy: Current-limiting fuse with I²t rating of 300 A²s, magnetic trip mechanism calibrated at 8×In
Trigger Dielectric breakdown from 3 kV/μs voltage transients
Mode: Tracking carbonization along creepage path <8 mm/kV
Strategy: Arc chute with deionizing plates spaced at 1.5 mm, UL94 V-0 rated housing with CTI >600 V

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 DNA

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

Verified manufacturers with capability to produce this product in China

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✓ 98% Supplier Capability Match Found

S Sourcing Manager from Singapore Feb 13, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
P Procurement Specialist from Germany Feb 10, 2026
★★★★☆
"As a professional in the Electrical Equipment Manufacturing sector, I confirm this Circuit Breaker / Fuse Holder meets all ISO standards. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Brazil Feb 07, 2026
★★★★★
"Standard OEM quality for Electrical Equipment Manufacturing applications. The Circuit Breaker / Fuse Holder arrived with full certification."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

9 sourcing managers are analyzing this specification now. Last inquiry for Circuit Breaker / Fuse Holder from Vietnam (58m ago).

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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 Specifications verified by CNFX Industrial Index (v2.6.03) for Electrical Equipment Manufacturing sector.

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