Editorial Technical Reference

Circuit Breakers/Disconnect Switch

This page explains how Circuit Breakers/Disconnect Switch is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Electrical safety devices that protect circuits from overloads and provide isolation for maintenance

Product Specifications

Technical details and manufacturing context for Circuit Breakers/Disconnect Switch

Definition
Circuit breakers and disconnect switches are critical safety components within industrial control panels (PLC/HMI systems) that serve dual functions: circuit breakers automatically interrupt electrical flow during overload or short circuit conditions to prevent equipment damage and fire hazards, while disconnect switches provide manual isolation capabilities to de-energize circuits for safe maintenance and servicing of control panel components. These devices are designed for use in electrical equipment manufacturing and are rated for specific voltage, current, and interrupting capacities appropriate for industrial control applications. The product range includes devices with rated voltages from 230 to 690 V AC, rated currents from 16 to 6300 A, and breaking capacities from 6 to 150 kA, according to IEC 60947-2. They are available with 1 to 4 poles and various tripping curves (B, C, D) per IEC 60898-1. Rated insulation voltage ranges from 690 to 1000 V, and rated impulse withstand voltage from 4 to 12 kV, per IEC 60947-1. Operating temperature range is -40 to 85 °C, with degrees of protection from IP20 to IP65 (IEC 60529). Mechanical endurance ranges from 10,000 to 50,000 cycles, and electrical endurance from 1,000 to 10,000 cycles, per IEC 60947-2. Contact resistance is 0.1 to 1.0 mΩ, and weight ranges from 0.5 to 500 kg. Materials include thermoset plastic housing, copper alloy contacts, silver alloy arcing contacts, and steel operating mechanism. These values are reference ranges; verify model-specific data with the manufacturer.
Working Principle
Circuit breakers operate on thermal-magnetic principles: thermal elements respond to sustained overloads, while magnetic elements react to short-circuit currents, tripping the mechanism to open the circuit. Disconnect switches provide visible air gaps when opened, ensuring complete electrical isolation. Both devices are rated for specific voltage, current, and interrupting capacities. The operating mechanism is made of steel, and contacts use copper and silver alloys for conductivity and arc resistance. The thermoset plastic housing provides insulation and mechanical protection. Selection requires matching rated voltage, current, breaking capacity, and other parameters to the application. Verification should include checking the device's ratings against the system requirements and confirming compliance with relevant standards.
Common Materials
Thermoset plastic housing, Copper alloy contacts, Silver alloy arcing contacts, Steel operating mechanism
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Voltage230–690 V ACHigher voltage requires increased clearance and creepage distances.IEC 60947-2
Rated Current16–6300 AContinuous current rating at specified ambient temperature.IEC 60947-2
Breaking Capacity6–150 kAMaximum short-circuit current the breaker can interrupt.IEC 60947-2
Number of Poles1–4 PSelect based on system configuration and protection requirements.
Tripping CurveB, C, DB for resistive loads, C for inductive, D for high inrush.IEC 60898-1
Rated Insulation Voltage690–1000 VDetermines insulation coordination and safety distances.IEC 60947-1
Rated Impulse Withstand Voltage4–12 kVWithstand capability against lightning and switching surges.IEC 60947-1
Operating Temperature-40–85 °COutside this range, derating or special materials required.IEC 60947-1
Degree of ProtectionIP20–IP65Higher IP for dusty or wet environments.IEC 60529
Mechanical Endurance10000–50000 cyclesNumber of no-load operations before mechanical failure.IEC 60947-2
Electrical Endurance1000–10000 cyclesNumber of operations under load before contact wear-out.IEC 60947-2
Contact Resistance0.1–1.0 mΩLow resistance minimizes power loss and heating.IEC 60947-1
Weight0.5–500 kgAffects mounting and handling; varies with rating and poles.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Operating Mechanism
    Manual or motorized mechanism to open/close contacts
    Material: Steel alloy
  • Arc Chute
    Extinguishes electrical arcs during circuit interruption
    Material: Deionizing plates
  • Contacts Part
    Conduct current when closed and provide isolation when open
    Material: Silver alloy with copper backing
  • Trip Unit
    Senses overload/short circuit conditions and triggers opening mechanism
    Material: Electronic components and bimetallic strips
  • Housing
    The moulded case that insulates the live parts and holds the mechanism.

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1000V AC/DC (voltage rating), not pressure-sensitive
other spec: Current rating: 0.5A to 6300A, Breaking capacity: 6kA to 200kA, IP rating: IP20 to IP67
temperature: -40°C to +85°C (standard), up to +125°C (specialized)
Media Compatibility
✓ Indoor dry environments ✓ Clean industrial air ✓ Standard electrical panels
Unsuitable: Corrosive/explosive atmospheres (unless specifically rated for hazardous locations)
Sizing Data Required
  • Rated current (Amps)
  • Short-circuit breaking capacity (kA)
  • System voltage (V AC/DC)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Contact erosion and welding
Cause: Arcing during operation, high current loads, or poor contact alignment leading to overheating and material degradation
Mechanical binding or failure to operate
Cause: Corrosion, lack of lubrication, accumulation of dust/debris, or worn mechanical components preventing proper movement
Maintenance Indicators
  • Visible arcing, sparks, or smoke during operation
  • Unusual buzzing, humming, or crackling sounds indicating electrical discharge
Engineering Tips
  • Implement regular infrared thermography inspections to detect abnormal heating at contacts and connections before failure occurs
  • Establish a preventive maintenance schedule for cleaning, lubrication, and operational testing based on manufacturer recommendations and operational cycles

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60947-2: Low-voltage switchgear and controlgear - Circuit-breakers ANSI C37.13: Low-Voltage AC Power Circuit Breakers Used in Enclosures EN 60947-3: Low-voltage switchgear and controlgear - Switches, disconnectors, switch-disconnectors and fuse-combination units

Quoted from the published standard.

Manufacturing Precision
  • Contact gap tolerance: +/-0.5mm
  • Terminal flatness: 0.2mm maximum deviation
Quality Inspection
  • Dielectric withstand voltage test
  • Mechanical endurance test (operation cycles)
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Circuit Breakers/Disconnect Switch

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

CHYT
Zhejiang, CN
120 staff
Also makes: Surge Protection Device, Energy Meter, Feed Box and 5 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “DC Disconnect Switch”
View source page ↗ chytdcmcb.com · recorded 2026-09-10
Huayi Electric Co., Ltd.
Wenzhou, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Outdoor Disconnect Switch”
View source page ↗ heag.cn · recorded 2026-08-26
Liyond
Zhejiang, CN
Founded 2001
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Disconnect Switch”
View source page ↗ liyond.com · recorded 2026-08-26
Xi'an Xigao Electricenergy Group Co., Ltd.
Xian, Shaanxi, CN
Founded 1993320000m2
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “High Voltage Disconnect Switch”
View source page ↗ loadbreak-switch.com · recorded 2026-08-26
ZHIYUE GROUP CO. LTD
Zhejiang, CN
Founded 19916800 square meters
ISO9001 CCC CE TSE
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Indoor High Voltage Disconnect Switch”
View source page ↗ zhiyue.com · recorded 2026-08-26
Beny New Energy
Zhejiang, CN
Also makes: Battery System, DC Switch / Isolator, Feed Box and 8 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “AC Disconnect Switch”
View source page ↗ beny.com · recorded 2026-09-09
CNKEEYA
Yueqing, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Disconnect Switch”
View source page ↗ cnkeeya.com · recorded 2026-09-10
Dehler Technology Co., Ltd.
Wenzhou, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Load Disconnect Switch”
View source page ↗ dehlertech.com · recorded 2026-09-05
Henan Fengyuan Power Technology Co., Ltd.
Henan, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “High Voltage Disconnect Switch”
View source page ↗ switchgear-china.com · recorded 2026-08-31
HIITIO
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “DC Disconnect Switch”
View source page ↗ hiitio.com · recorded 2026-08-28
HIITIO (Hecheng Electric)
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “DC Disconnect Switch”
View source page ↗ hecheng-electric.com · recorded 2026-09-16
TAIXI Electric Co.,LTD
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Solar Disconnect Switch”
View source page ↗ txele.com · recorded 2026-09-03
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Frequently Asked Questions

What is the difference between a circuit breaker and a disconnect switch?

A circuit breaker automatically interrupts electrical flow during overload or short circuit conditions to protect equipment. A disconnect switch provides manual isolation to de-energize a circuit for maintenance. Both are used in industrial control panels, but they serve different functions.

What standards apply to these devices?

The devices are referenced to IEC 60947-2 for circuit breakers, IEC 60898-1 for tripping curves, IEC 60947-1 for insulation and impulse voltage, and IEC 60529 for degrees of protection. These standards are procurement references; actual compliance must be verified with the manufacturer.

How do I select the right device for my application?

Consider the rated voltage, current, breaking capacity, number of poles, tripping curve, and environmental conditions such as temperature and protection degree. Match these parameters to your system's requirements and consult the manufacturer for model-specific data.

What maintenance is required?

Regular inspection for signs of wear, such as contact erosion or mechanical damage, is recommended. Check the operating mechanism and contacts periodically. The mechanical and electrical endurance ratings indicate expected life under specified conditions. Always follow the manufacturer's maintenance guidelines.

Related equipment

Applied To / Applications

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

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Circuit Breakers/Disconnect Switch.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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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