Suntree 1000V 250A DC MCCB circuit breaker

Suntree 1000V 250A DC MCCB circuit breaker

Suntree 1000V 250A DC MCCB Circuit Breaker (SM8-250HPV) is a photovoltaic-grade moulded case circuit breaker purpose-built for high-current commercial and industrial solar PV systems. Rated at 1000VDC and 250A with a 20kA breaking capacity, it delivers heavy-duty overload and short-circuit protection for solar strings, inverters, battery banks, and DC distribution systems. CE and ISO9001 certified, compact in design, and equipped with a quick-close mechanism — it is the trusted high-current DC protection solution for solar installations across Kenya.

What Is the Suntree 1000V 250A DC MCCB?

The SM8-250HPV is a photovoltaic-specialist DC moulded case circuit breaker developed specifically for the demanding protection requirements of solar power systems. Unlike standard MCBs rated for low-current applications, this MCCB is engineered to handle the high fault currents and sustained DC voltages found in commercial solar string arrays, large battery banks, and industrial DC power distribution systems.

The SM8-250HPV series is suitable for DC grid circuits with a rated voltage of up to 1000VDC and a rated current of 250A. It provides both overload long delay protection and instantaneous short-circuit protection — distributing electrical energy safely while shielding your system and components from the dangers of overload, short circuit, and other electrical faults.

Key Features of the Suntree 1000V 250A DC MCCB

Overload Long Delay Protection

The SM8-250HPV features overload long delay protection that monitors sustained overcurrent conditions and trips the breaker after a defined delay — protecting wiring, inverters, and solar panels from damage caused by prolonged overloads without nuisance tripping during normal operation.

Instantaneous Short Circuit Protection

For sudden, high-magnitude fault currents, the breaker trips instantaneously — disconnecting the faulty circuit within milliseconds to prevent catastrophic damage to solar inverters, battery banks, and connected DC equipment.

High 20kA Breaking Capacity

With a breaking capacity of 20kA, the Suntree 250A MCCB safely interrupts even the most severe fault currents found in large commercial solar installations — providing a higher level of protection than standard DC MCBs rated at 6kA.

Labyrinth Arc Extinguishing Chamber

The built-in labyrinth arc extinguishing system prevents the spread of arcs during current surges, while built-in double-row moving contacts increase the arc voltage — ensuring fast, clean circuit interruption that protects both the breaker and connected equipment.

Quick-Close and Fast-Reset Mechanism

The operating mechanism features quick-closing and fast-reset segmentation functions — allowing rapid re-energisation after a trip has been cleared, minimising system downtime on high-traffic commercial solar sites.

Compact and Installer-Friendly Design

Despite its high current rating, the SM8-250HPV is designed with a compact, small footprint and convenient use in mind — fitting neatly into solar combiner boxes, DC distribution boards, and electrical enclosures without requiring excessive panel space.

No Polarity Restriction

The breaker can be reversed during installation without any risk — simplifying on-site wiring for solar installers and electricians and reducing the chance of costly installation errors.

IEC60947-1 and IEC60947-2 Certified

The SM8-250HPV fully complies with IEC 60947-1 (General Rules for Low Voltage Switchgear and Controlgear) and IEC 60947-2 (Circuit Breakers) — meeting the highest international safety and performance standards for commercial solar DC protection.

Technical Specifications

Where to Use the Suntree 1000V 250A DC MCCB

Commercial Rooftop Solar PV Systems

The 250A current rating and 1000VDC voltage rating make this MCCB the ideal main DC disconnect and protection device for medium to large commercial rooftop solar installations in Kenya — safeguarding the critical connection between solar string arrays and the grid-tie or hybrid inverter.

Solar String and Combiner Box Protection

The SM8-250HPV protects the cables located between photovoltaic module strings and the solar inverter against overloads and short circuits — the most critical protection point in any commercial solar installation.

Battery to Inverter Protection and Shutoff

This MCCB is widely used as a high-current DC disconnect between large battery banks and solar inverters — providing safe isolation during maintenance, emergencies, and system shutdowns while protecting both the battery and inverter from fault currents.

Large Off-Grid Solar Systems

For large off-grid solar power systems serving farms, schools, commercial buildings, and rural electrification projects across Kenya, the 250A rating provides the heavy-duty DC circuit protection needed for reliable, uninterrupted operation.

Industrial DC Power Distribution

Ideal for industrial DC distribution boards and combiner boxes where high-current DC circuits need reliable overload and short-circuit protection — including manufacturing plants, telecommunications facilities, and data centres with DC backup power systems.

Solar Hybrid and On-Grid Power Stations

The SM8-250HPV is a trusted protection component in both hybrid solar systems and on-grid solar power stations — providing the main DC circuit protection between high-voltage solar arrays and multi-kilowatt inverter banks.

Suntree 1000V 250A MCCB vs Standard DC MCB — Key Differences