1P DC Miniature Circuit Breaker

Pugao 1P DC Miniature Circuit Breaker is a single pole modular protection component designed for DC power supply systems. The essential difference between DC and AC circuit breakers is that there is no zero crossing point for current in DC, and the arc generated by the fault will continue to burn, making it more difficult to extinguish. This product is specifically equipped with a magnetic blow out arc chamber to effectively suppress the risk of DC arc. It integrates a dual protection mechanism of thermal and magnetic protection: delayed tripping in case of long-term overload, and rapid circuit interruption in milliseconds in case of short circuit fault. After troubleshooting, manually turning the handle can restore power without the need to replace components.

Mora PLS-60H-DC 1P DC miniature circuit breaker, rated current C63, rated voltage 1000V DC, breaking capacity 10kA, compliant with IEC 60898-1.

It is DC dedicated MCB for solar PV combiner box and DC energy storage system. It provides overload and short-circuit protection, no residual current protection. 1-pole design. Only copper wire connection. Installed on standard 35mm DIN rail.

Core technical parameters

Number of poles: 1P (single pole, used for DC positive/negative single circuit protection)

Rated working voltage: DC 250V

Release characteristics: B/C/D curves are optional

Rated current specifications: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A

Ultimate short-circuit breaking capacity: 6kA/10kA optional

Installation method: 35mm standard DIN rail installation

Shell material: flame retardant PA66 nylon

Mechanical and electrical lifespan: 10000 operating cycles

Execution standard: IEC 60947-2, CE certification

Polarity requirement: Wiring must be strictly constructed according to the terminal "+/-" markings

Core advantages of the product

Built in permanent magnet blowing mechanism and widened multi-layer grid arc extinguishing chamber. When a short circuit fault generates a continuous DC arc, the magnetic field drives the arc to quickly enter the arc extinguishing grid, divide, cool and extinguish the arc, and solve the most dangerous arc problem in the DC circuit from the root. It is strictly prohibited to use AC MCBs as a substitute for DC scenarios. AC models have insufficient arc extinguishing capabilities, which can easily lead to fire accidents.

Bimetallic plates are used to delay the release of cables due to slow heating caused by long-term overload; The electromagnetic triggering unit can operate at high speed when a battery short circuit or photovoltaic module failure generates a huge instantaneous current. Multi curve selection to avoid false tripping caused by capacitive surge current on batteries and photovoltaic modules.

The 1P DC Miniature Circuit Breaker uses anti arc silver alloy contacts specially developed for DC breaking scenarios. Enduring multiple DC breaking erosion, the contact resistance is lower and the heat generation is reduced under continuous load, ensuring the long-term stable operation of the circuit breaker and extending the product's service life.

The PA66 flame-retardant nylon shell has undergone rigorous testing using hot wire. Will not melt or conduct flames in abnormally high temperature environments, improving the safety level inside enclosed photovoltaic combiner boxes and battery energy storage cabinets.

The mechanical status window is independent of the operating handle, allowing maintenance personnel to visually confirm the true on/off status of the contacts. In live DC maintenance operations, it effectively avoids safety accidents caused by misjudging the switch status.

Application scenarios and practical cases

1. For small-scale rooftop photovoltaic systems, each photovoltaic string uses a 1P DC C-curve 20-32A MCB as a cascade overcurrent protection and maintenance isolation switch. When a single photovoltaic module experiences a short circuit fault, the circuit breaker quickly trips to isolate the faulty branch, while the rest of the photovoltaic array can still operate normally. Attention: The 1P DC circuit breaker only disconnects a single pole wire, and the system design needs to evaluate whether full pole isolation is required according to local photovoltaic regulations.

2. Off grid battery energy storage cabinet, using this 1P DC Miniature Circuit Breaker in the positive branch circuit of the battery. Once the insulation of the cable is damaged and a short circuit occurs between the positive and negative busbars, the fault current can be instantly cut off, reducing the risk of battery thermal runaway.

3. Communication base station 48V DC power supply rack, with multiple 1P DC Miniature Circuit Breakers providing independent protection for signal module, rectifier auxiliary circuit, and remote monitoring unit. Single module compact structure enables high-density distribution within a narrow cabinet.

Important Notice on Installation and Safety

1. Installed on a standard 35mm DIN rail; Strictly follow the polarity identification of the shell for wiring; Reverse polarity will reduce the effectiveness of magnetic blow out arc, posing a safety hazard.

2. The 1P DC MCB only disconnects a single DC wire, and it is necessary to evaluate whether 2-pole full isolation is required according to local electrical regulations.

3. It is prohibited to use AC miniature circuit breakers in DC circuits.

4. Select the matching trip curve, rated current, and breaking capacity based on the actual short-circuit current of the photovoltaic/battery system.

5. For long-term use of outdoor photovoltaic cabinets, it is recommended to conduct regular visual inspections.

FAQ

Q: What is the difference between 1P DC MCB and 1P AC MCB?

A: The DC MCB is equipped with a magnetic extinguishing arc chamber to extinguish continuous DC arcs and is sensitive to polarity; MCB communication relies on AC power for natural zero crossing arc extinguishing, with no polarity requirements, and the two cannot be used interchangeably.

Q: How to choose B/C/D curves in DC scenarios?

A: B curve: 3-5 times rated current trip, suitable for precision electronic DC loads; C-curve: 5-10 times rated current trip, most commonly used for photovoltaic strings and energy storage batteries; D curve: 10-20 times rated current trip, used for high impact inductive loads such as DC motors.

Q: Should we choose 1P or 2P DC MCB for the photovoltaic system?

A: The advantage of 1P DC Miniature Circuit Breaker is that it saves space and is used for single wire branch protection; 2P DC MCB simultaneously cuts off the positive and negative poles to achieve complete electrical isolation, commonly used for main busbars or large photovoltaic projects.

Product interpretation: Mora PLS-60H-DC 1P DC miniature circuit breaker (DC MCB, without leakage)

Basic Parameters

Brand: Mora

Model: PLS-60H-DC

Specification: 1P C63

C63: C-type trip, rated current 63A

Rated DC voltage: 1000V DC

Rated short-circuit breaking ICU: 10kA

Execution standard: IEC 60898-1

Installation: 35mm standard DIN rail buckle installation

Label Cu Only: Only copper wires are allowed to be connected

Product Description

DC dedicated circuit breaker, not suitable for AC circuits, mostly used for photovoltaic solar combiner boxes and energy storage DC branch protection

1P unipolar design, DC circuit on-off control

C-trip curve, capable of withstanding photovoltaic start-up surge current and reducing the probability of false tripping

Protection function: overload protection+short circuit protection, no leakage protection

The shell is marked with polarity arrows, and the DC wiring must strictly follow the polarity direction, and the positive and negative poles must not be reversed

⚠️ Important reminder: The arc extinguishing structure of a DC circuit breaker is different from that of an AC MCB. It is strictly prohibited to use it as an AC circuit breaker. Connecting to AC may result in arc extinguishing failure and pose a risk of fire.