Best Moulded Case Circuit Breakers for DC Solar Systems
Moulded Case Circuit Breakers (MCCBs) are essential for protecting DC power systems used in solar installations, wind power setups, and off-grid batteries. This guide highlights five reliable MCCBs designed for DC environments, focusing on protection against overloads, short circuits, and voltage spikes. Each product section covers core features, typical applications, and construction which supports safe, durable operation in demanding conditions.
Summary of selected products:
| Brand | Model | Voltage Rating | Current Rating | Poles |
|---|---|---|---|---|
| Hilitand | Moulded Case Circuit Breaker 200A MCCB Solar Battery Switch 2P DC1000V | DC1000V | 200A | 2P |
| Jectse | DC 500V 160A 20kA 2P MCCB | 500V DC | 160A | 2P |
| Liccx | SGM1-250Z/2300 DC Circuit Breaker, 500V 160A 2P | 500V DC | 160A | 2P |
| Baomain | 125A DC Circuit Breaker 2 Pole 550V | 550V DC | 125A | 2P |
| Baomain | 100A DC Circuit Breaker 2 Pole 550V | 550V DC | 100A | 2P |
Hilitand 200A MCCB Solar Battery Switch
The Hilitand MCCB is designed for distributing electrical energy while defending circuits and equipment from faults such as overloads, short circuits, and undervoltage. It operates by disconnecting the circuit during overcurrent, helping to protect solar and DC systems. Features include a compact footprint, flame-retardant shell, high breaking capacity, and short flashover performance, suitable for demanding DC environments.
Jectse DC 160A 2P MCCB For DC Power Lines
Jectse’s DC MCCB is tailored for DC power lines, including photovoltaic solar, wind, and hydropower applications. It provides shutoff for short circuits, overloads, and emergency manual power-off. This 2P device is widely used in low-voltage DC systems, rooftop solar deployments, and automotive DC power distribution, balancing protection with straightforward operation.
Liccx SGM1-250Z/2300 DC Circuit Breaker
The Liccx MCCB supports DC power lines in solar, wind, and automotive contexts. It includes short circuit and overload protection with emergency manual power-off functionality. It’s well-suited for PV arrays and other low-voltage DC distribution networks, offering dependable performance across typical DC operating ranges.
Baomain 125A 550V DC MCCB
This 125A DC MCCB provides robust 20kA ICU breaking capacity with 8kV impulse withstand, ideal for demanding DC circuits in PV systems, UPS backups, and battery banks. It conforms to IEC60947-2, includes IP20 protection, and operates reliably in a wide temperature range, offering versatility for both off-grid and grid-connected DC storage networks.
Baomain 100A 550V DC MCCB
Baomain’s 100A DC MCCB offers ample protection for smaller DC distribution networks. With 20kA ICU breaking capacity and 8kV surge withstand, it remains suitable for PV configurations, battery installations, and similar DC power systems. It’s designed for reliability in varied environments, including off-grid solar setups.
Heschen HSM1PV-250 DC MCCB 2P
Heschen’s HSM1PV-250 is a 2P DC photovoltaic circuit breaker rated at 550V DC and 250A. It features a 10kA breaking capacity with 8kV impulse withstand, making it a robust choice for solar PV systems, grid-tied PV installations, and other DC distribution networks requiring reliable overcurrent protection and swift disconnection in fault conditions.
Heschen HSM1PV-125 DC MCCB
Heschen’s HSM1PV-125 provides 2P DC protection at 550V and 125A. With a 10kA breaking capacity and 8kV impulse withstand, it supports solar installations and DC distribution networks requiring dependable interrupting performance and compact form, suitable for tight spaces in PV system enclosures.
Buying Guide: Key Considerations For Choosing DC MCCBs
When selecting a moulded case circuit breaker for DC applications, consider these aspects to ensure proper protection and reliability:
- Voltage and current ratings: Match the DC system’s maximum voltage and continuous current to prevent nuisance tripping or under-rated protection.
- Breaking capacity and surge withstand: Ensure ICU/Breaking Capacity and Uimp specifications exceed the expected fault levels and transient spikes in your installation.
- Number of poles and wiring compatibility: Most DC systems use 2-pole configurations; verify compatible wiring gauges (AWG/mm²) for safe connections.
- Environmental range and enclosure: Check operating temperature, humidity, dust exposure, and IP rating to fit your installation environment.
- DC-specific features: Look for manual shutoff, quick disconnection, and suitability for PV, battery banks, or wind/hydropower DC networks.
- Standards and certification: IEC60947-2 and related standards indicate reliability and safety for DC MCCBs in household, commercial, or industrial settings.
- Physical size and mounting: Evaluate space constraints in electrical panels or enclosures and ensure compatible mounting methods.
- Availability and warranty: Consider supplier support, replacement parts, and warranty terms to maintain long-term operation.
Industrial and residential DC projects require careful selection to balance protection, cost, and ease of maintenance. By reviewing the features and ratings of the MCCBs listed above, system designers can align protection schemes with solar, battery, and DC distribution requirements while staying compliant with relevant standards.