Circuit Breaker/Switch Component | Electrical Equipment Directory

Product Specifications

Technical details and manufacturing context for Circuit Breaker/Switch

Definition

This component is a dual-function device commonly integrated into power strips or outlets. As a circuit breaker, it continuously monitors the electrical current flowing through the circuit. When an overload or short circuit occurs, it automatically trips, disconnecting the power supply to prevent damage to connected equipment and reduce the risk of fire. As a switch, it provides manual control, allowing users to safely turn power on or off to individual outlets or the entire strip. The device is designed for use in electrical equipment manufacturing, serving as a critical safety component in various applications. Its construction includes a thermoset plastic housing, copper alloy contacts, a bimetallic strip, and an electromagnetic coil. The device operates within a range of rated voltages from 230 to 690 V AC, rated currents from 16 to 6300 A, and breaking capacities from 6 to 150 kA, depending on the model. It is available with 1 to 4 poles and offers tripping curves B, C, or D to suit different load types. The rated insulation voltage ranges from 690 to 1000 V, and the rated impulse withstand voltage from 6 to 12 kV. Operating temperature ranges from -40 to 85 °C, with degrees of protection from IP20 to IP65. Mechanical endurance is between 10,000 and 50,000 cycles, and electrical endurance between 1,000 and 10,000 cycles. Contact resistance is ≤0.5 mΩ, and weight varies from 0.5 to 50 kg. These values are reference ranges; always verify model-specific parameters with the legal manufacturer or supplier.

Working Principle

The circuit breaker function uses a thermal-magnetic mechanism. A bimetallic strip bends when heated by overcurrent, eventually triggering a mechanical release that opens the contacts. An electromagnetic coil responds almost instantly to short-circuit currents, providing rapid interruption. The switch function relies on mechanical contacts that physically connect or disconnect the circuit when actuated by a toggle, rocker, or push-button mechanism. This dual operation ensures both automatic protection and manual control.

Common Materials

Thermoset plastic housing, Copper alloy contacts, Bimetallic strip, Electromagnetic coil

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	230–690 V AC	Higher voltage requires increased clearance and creepage distances.IEC 60947-2
Rated Current	16–6300 A	Select based on load current and coordination with upstream protection.IEC 60947-2
Breaking Capacity	6–150 kA	Must exceed prospective short-circuit current at installation point.IEC 60947-2
Number of Poles	1–4 P	Choose based on system configuration (single-phase, three-phase, etc.).
Tripping Curve	B, C, D	B for resistive loads, C for inductive, D for high inrush.IEC 60898-1
Rated Insulation Voltage	690–1000 V	Determines insulation coordination and clearance requirements.IEC 60947-1
Rated Impulse Withstand Voltage	6–12 kV	Ensures withstand against lightning and switching surges.IEC 60947-1
Operating Temperature	-40–85 °C	Outside this range, derating or special materials may be required.IEC 60947-1
Degree of Protection	IP20–IP65	IP20 for indoor, IP65 for outdoor or washdown areas.IEC 60529
Mechanical Endurance	10000–50000 cycles	Number of no-load operations before mechanical failure.IEC 60947-1
Electrical Endurance	1000–10000 cycles	Number of load operations at rated current before contact wear.IEC 60947-1
Contact Resistance	≤0.5 mΩ	Low resistance minimizes power loss and heating.
Weight	0.5–50 kg	Affects mounting and handling; varies with frame size.

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

Contacts Part
Carry current when closed and create air gap when open to interrupt current flow

Material: Silver-plated copper alloy
Operating mechanism
Mechanical linkage that opens/closes contacts and provides quick-make/quick-break action

Material: Thermoplastic with steel springs
Trip unit
Detects overcurrent conditions and triggers the mechanism to open the circuit

Material: Bimetallic strip (thermal) and electromagnetic coil (magnetic)
Arc chute
Extinguishes electrical arc formed when contacts separate under load

Material: Deionizing plates (steel with ceramic)

Applied To / Applications

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

Power Strip/Outlet

View system integration details

Manufacturers of Circuit Breaker/Switch

2 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.

Ningbo Liming Relay

Zhejiang, CN

Also makes: Circuit Breaker

Listed on the company's own website · profile compiled by CNFX from public sources

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Wrindu

Shanghai, CN

Also makes: Portable Digital Multimeter, Surge Protection Device, Power Analyzer and 8 more

Listed on the company's own website · profile compiled by CNFX from public sources

View profile Send enquiry

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

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Frequently Asked Questions

What is the difference between the circuit breaker and switch functions?

The circuit breaker function automatically interrupts current during overload or short circuit, while the switch function provides manual on/off control. Both are integrated into the same device.

How do I select the correct tripping curve?

Tripping curve B is for resistive loads, C for inductive loads, and D for high inrush currents. Choose based on the load type and coordination with upstream protection.

What does the breaking capacity indicate?

Breaking capacity is the maximum short-circuit current the device can interrupt without damage. It must exceed the prospective short-circuit current at the installation point.

Why is it important to verify model-specific parameters?

The listed values are reference ranges. Actual performance depends on the specific model and application. Always confirm with the legal manufacturer or supplier.

Data Basis

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

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (typical enclosure rating)
other spec:	Rated current: 0.5A to 6300A, Rated voltage: 240V to 38kV, Breaking capacity: 6kA to 200kA, Insulation class: I-IV
temperature:	-40°C to +85°C (operating), -55°C to +125°C (storage)

Circuit Breaker/Switch

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards