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DC Circuit Breaker – Miniature Circuit Breakers for DC and Solar Generation

Solar Circuit Breakers: The difference between DC and AC breakers

DC Circuit Breaker - Miniature Circuit Breakers for DC and Solar Generation

The JB is a DC circuit breaker dedicated to multi string photovoltaic installations.
This circuit breaker is designed to protect the cables located between each string of photovoltaic modules and the photovoltaic inverter against overloads and short circuits.
Combined with a switch , the JB will be installed in a string PV protection enclosure at the end of each string of photovoltaic modules.
It can be locked (by a padlocking device) in OFF position as a safety measure for removal of the PV inverter.
Since a fault current can flow in the reverse direction to the operating current, the JB can detect and protect against any bidirectional current.
To ensure the safety of the installation, it is necessary, depending on the various types of application, to combine the JB with:

a residual current device at the AC end

a fault passage detector (insulation monitoring device) at the DC end

an earth protection circuit breaker at the DC end

brochure

NOTES

In all cases, fast action on site will be required to clear the fault (protection not ensured in the event of a double fault).
JB is not polarity sensitive: (+) and (-) wires can be inverted without any risk.

Meaning and classification models

Main characteristics

Operating Voltage (Ue)	1P=250 V DC, 2P=500 V DC 3P=750 V DC, 4P=1000 V DC
Rated insulation voltage (Ui)	1,000 VDC
Breaking capacity (Icu)	10 kA
Impulse voltage (Uimp)	4 kA
Electrical connection	By the bottom for In and Out
Number of poles	1P, 2P, 3P, 4P
Standards	IEC 60947-2 EN 60947-2

Technical data

Position contact indication – suitability for isolation according to IEC/EN 60947-2 standard.
The presence of the green strip guarantees physical opening of the contacts and allows operations to be performed on the downstream circuit in complete safety.
Increased product service life thanks to fast closing independent of the speed of actuation of the toggle.
Pre-wired product: Input / Output on the same side.

Rated service breaking capacity (Ics)		100 % of the Icu
Endurance (O-C)	Electrical	1,500 cycles (where L/R=2 ms)
	Mechanical	20, 000 cycles

Mechanical		20, 000 cycles
Degree of pollution		2
Category		A (no delay in accordance with IEC / EN 60947-2 standards)
Degree of protection (IEC 60529)		IP40
Tropicalisation		Relative humidity: 95 % at 55°C in accordance with IEC 60068-2 and GB 14048.2 standards
Temperature	Operating	-25°C to 70 °C
	Storage	-40°C to 85°C

Curve

Instantaneous Trip

B Curve
These MCBs are suitable for cable protection.
Rating: 1-63A(30℃)
Instantaneous trip: (3-5)In
C Curve
Suitable Domestic and residential applications and electromagnetic starting loads with
medium starting currents.
Rating: 1-63A(30℃)
Instantaneous trip: (7-10)In
D Curve
Suitable for inductive and motor loads with high starting currents.
Rating: 1-63A（30℃)
Instantaneous trip: (10-14)In
K Curve
Suitable for inductive and motor loads with high inrush currents.
Rating: 1-63A(30℃)
Instantaneous trip: (14-18)In

Wiring Diagram

Installation

Dimensions (mm)

Weight (g)

Circuit breaker
Type	1P	2P	3P	4P
Weight (g)	120	240	360	480

Connection

AC Vs DC Circuit Breakers: The importance of the DC ARC Extinguisher

TYPICAL APPLICATIONS

Application #1 Railway

DC circuit breakers are crucial for ensuring safety and reliability of power systems in railways. These breakers are capable of quickly detecting faults in circuits and cutting off the current to prevent damage to electrical equipment or potential fires. In railway systems, DC circuit breakers can also assist with controlling the operation and stopping of trains, as well as optimizing energy usage.

Application #2 Power System

DC Circuit Breakers are essential for safe and reliable power systems, especially in solar energy. These breakers detect and isolate faults, protecting PV panels from overcurrent conditions and maximizing system efficiency.

Application #3 Home

DC Breakers are an essential safety feature for home electrical systems. These breakers protect against overcurrent conditions that can lead to electrical fires and equipment damage. In addition, they can help homeowners optimize energy usage by monitoring and controlling the flow of electricity.

Application #4 Office Building

DC Breakers are commonly used in office buildings for a variety of applications, such as protecting electrical panels and equipment, controlling lighting and HVAC systems, and managing emergency power systems. They are also a crucial component of renewable energy systems, such as solar panels and wind turbines.

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