| Brand | MV Switchgear Accessories |
| Model NO. | GYM7DC High Voltage Molded Case Circuit Breaker for PV |
| Rated normal current | 320A |
| Rated lightning impulse voltage | 12kV |
| Series | GYM7DC |
GYM7DC series DC molded case circuit breakers are suitable for circuits with rated operating voltage up to DC1500V, rated insulation voltage up to 1500V, rated impulse withstand voltage up to 12kV, and rated current of 10A~630A. They can be installed vertically or horizontally and can withstand environments such as humid air, salt spray, oil mist, mold, etc
GYM7DC series DC molded case circuit breaker product features:
1. The GYM7DC series DC plastic shell circuit breaker (hereinafter referred to as the circuit breaker) has a rated working voltage of up to DC1500V, a rated insulation voltage of 1500V, a rated impulse withstand voltage of up to 12kV, and a rated current of 10A~630A.
2. This circuit breaker can be installed vertically or horizontally.
3. This circuit breaker product complies with the following standards:
4. IEC 60947-1 and GB/T 14048.1 General Provisions
5. IEC 60947-2 and GB/T 14048.2 Low voltage circuit breakers.
Model |
GYM7DC-320 |
GYM7DC-400/630 |
GYM7DC-1600 |
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Rated Current |
63、80、100、125、140、160、180、200、225、250、315、320 |
225、250、320、350、400、500、630 |
800A、1000A、1250A、1500A、1600A |
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Number of poles |
2P |
2P |
3P |
4P |
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Rated Working Voltage Ue DC |
1500 |
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Rated Insulation Voltage Ui（V） |
1800 |
1800 |
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Rated Impulse withstand Voltage UImp |
12 |
12 |
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Power Frequency withstand Voltage（1min）（kV) |
3500 |
3500 |
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Rated Ultimates Short-Circuit Breaking Capacity Icu(V) |
DC 1200V |
DC 1500V |
DC 750V |
DC 1000V |
DC 750V |
DC 1000V |
DC 1200V |
DC 1500V |
Rated Service Short-Circuit Breaking Capacity Ics (kA) |
35kA |
20kA |
85kA |
50kA |
50kA |
30kA |
15kA |
10kA |
Mechanical Life（kA） |
4000 |
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Electrical Life（times） |
10000 |
500 |
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Arc Distance（times） |
50、0（with arc extinguishing chamber) |
100 |
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Basic Dimension W*L*H(mm) |
90*215*136 |
110*275*152 |
3P:210*340*244 4P:280*340*244 |
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Instantaneous release(mm) |
5In or 10In |
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Reference Ambient Temperature |
50℃ |
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The core differences are reflected in four aspects: voltage adaptability, arc extinguishing capacity, protection logic and scenario application:
① Voltage adaptability difference: The GYM7DC is specially designed for DC systems, with a rated voltage of up to 1500VDC, no zero-crossing arc extinguishing advantage, and relies on a strong arc extinguishing structure; traditional AC circuit breakers have a rated voltage of mostly 400VAC/690VAC, use the zero-crossing characteristic of AC to extinguish arcs, and cannot adapt to the PV DC high-voltage scenario.
② Arc extinguishing capacity difference: The GYM7DC adopts a multi-grid arc extinguishing chamber + magnetic blow arc extinguishing structure, which can quickly cut off DC arcs with a maximum breaking capacity of 100kA; traditional AC circuit breakers have a simple arc extinguishing chamber structure and insufficient DC breaking capacity, and forced use may lead to continuous arc combustion and equipment explosion.
③ Protection logic difference: Targeting the characteristics of PV systems, the GYM7DC integrates functions such as reverse connection protection and undervoltage tripping, and the overload protection curve can adapt to the power fluctuation of PV modules; traditional AC circuit breakers only have overload and short-circuit protection, without PV-specific protection functions.
④ Scenario application difference: The GYM7DC is suitable for scenarios such as the DC side of PV power stations, the input end of inverters and DC distribution of energy storage systems; traditional AC circuit breakers are suitable for industrial and civil AC distribution systems, and cannot meet the protection needs of PV DC high voltage.
The GYM7DC High Voltage Molded Case Circuit Breaker for PV is an electrical switchgear specially designed for high-voltage distribution protection of PV DC systems, with a rated working voltage of up to 1500VDC, a rated current range of 100A~1250A, and a maximum high breaking capacity of 100kA. Integrating core functions including overload protection, short-circuit protection, reverse connection protection and intelligent tripping, this equipment adopts a modular design and corrosion-resistant shell material, suitable for DC-side distribution protection of solar power plants, distributed PV systems and PV energy storage systems. It can be directly matched with PV inverters and combiner boxes to ensure the stable operation of PV systems under complex working conditions.
