DZ47 Air-Switch Circuit Breaker

The high quality DZ47 Air-Switch Circuit Breaker is offered by PUGAO (Plannter Electric) factory, is a kind of electrical protection device used in AC circuits, with two independent poles, capable of cutting off the fire wire and zero wire in the circuit at the same time. It monitors the current change in the circuit in real time through the built-in thermal magnetic stripping mechanism or electronic stripping mechanism, and when the circuit is overloaded, short-circuited and other abnormal conditions, DZ47 Air-Switch Circuit Breaker can be quickly and automatically disconnected to cut off the power supply, avoiding equipment damage, circuit fire and other safety accidents.The products manufactured by PUGAO strictly comply with the CE, CCC and ISO9001 certificates.

Working Principle

The DZ47 Air-Switch Circuit Breaker is a highly standardized product. PUGAO's mature manufacturing process and advanced technology utilize three core operating principles: thermal tripping, magnetic tripping, and air arc extinguishing. Our products provide reliable protection for thousands of electrical systems worldwide.

1. Thermal Trip

The circuit breaker contains a bimetallic strip composed of two metals with different coefficients of thermal expansion. When the circuit current exceeds the rated value but has not yet reached the short-circuit level, the heat generated by the current causes the bimetallic strip to bend to one side.

After bending to a preset angle, it triggers a mechanical linkage, causing the circuit breaker to trip. Leveraging 14 years of accumulated calibration experience, our bimetallic strip is made of high-purity material, resulting in a sensitive and consistent response to current fluctuations.

2. Magnetic Trip

The circuit breaker contains an electromagnetic coil. When a short circuit occurs, the current instantly surges to several times or even tens of times the normal value. This enormous current generates a powerful magnetic field in the coil, instantly attracting the electromagnet armature like a piston.

The armature directly impacts the tripping mechanism, achieving millisecond-level instantaneous power cut-off.

Our factory uses high-conductivity copper and a fully automated spot welding process to ensure the mechanism does not jam or fail under high-frequency current impact.

3. Arc Extinguishing System

At the instant the contacts separate, the high-voltage current breaks down the air, generating a high-temperature arc, which is drawn into a specially designed arc-extinguishing chamber. Multiple layers of metal grids divide the arc into several small segments, rapidly cooling and extinguishing it to prevent burnt contacts.

Our DZ47 series optimizes the arrangement density of the arc-extinguishing grid, effectively protecting internal components even under frequent tripping conditions.

Technical Advantages

PUGAO's DZ47 Air-Switch Circuit Breaker utilizes high performance thermo-magnetic disconnect technology to ensure accurate and reliable operation under a variety of complex operating conditions. The product has the following core advantages:

High breaking capacity: the standard model has a breaking capacity of up to 6kA, which meets the short-circuit protection requirements of urban power grids and industrial environments.

Wide voltage applicability: support AC 230/400V system, strong compatibility, applicable to a variety of national and regional power grid standards.

Modular design: compact size, support DIN rail mounting, easy to be integrated in all kinds of distribution boxes and control cabinets.

Strong arc extinguishing capability: DZ47 Air-Switch Circuit Breaker adopts the structure combining multi-layer ceramic spacer and metal arc extinguishing grille, which effectively suppresses arc and prolongs service life.

Long mechanical life: after rigorous testing, the mechanical operation life is up to more than 10,000 times.

FAQ

Q: Can the DZ47 series circuit breakers be used in DC systems?

A: No. The DZ47 series is an air switch designed specifically for AC. Alternating current (AC) has a zero-crossing characteristic, and its internal arc-extinguishing grid effectively extinguishes arcs.

Direct current (DC) does not have a zero-crossing characteristic. Using an AC circuit breaker may result in unextinguished arcs, potentially causing a fire. If you have solar or battery system needs, please contact us for specific DC Circuit Breaker specifications.

Q: How do I choose between the three different tripping curves (B, C, and D)?

A: The selection depends on your load type:

Type B (3-5In): Suitable for low inrush current loads, such as purely resistive heaters and computer equipment.

Type C (5-10In): The most common specification, suitable for lighting fixtures, general household appliances, and commercial power distribution.

Type D (10-14In): Suitable for equipment with extremely high starting currents, such as small motors, compressors, or industrial transformers.

Pugao has a professional technical team that can provide accurate selection advice based on your engineering drawings. Contact us to send your requirements and get a free quote!

For further technical questions, please consult our engineers immediately; we will respond quickly.