DC MCCB 400 Frame, 315A-400A - 3 Pole & 4 Pole | Onesto KCMD

The Onesto KCMD 400 Frame DC MCCB is a moulded case circuit breaker designed specifically for DC circuit protection and isolation, not standard AC mixed load use. It is suitable for electricians, solar installers and technicians working on large-scale solar PV installations, commercial battery energy storage systems and industrial DC distribution boards. Available in current ratings from 315A to 400A, in 3 Pole (750VDC) or 4 Pole (1000VDC) configurations.

• Application: Suitable for large solar PV, commercial battery storage and industrial DC distribution circuits
• Key specification: DC-rated, 750VDC (3 Pole) or 1000VDC (4 Pole)
• Current range: 315A, 350A or 400A
• Pole configuration: Available in 3 Pole (750VDC) or 4 Pole (1000VDC)
• Build quality: SABS approved to IEC 60947-2 / SANS 556-1, 400 frame

Key Features

• Purpose-built for DC circuits — not a like-for-like substitute for an AC MCCB
• Higher pole count increases the rated DC voltage withstand, allowing 4 Pole units to be used on higher-voltage DC strings
• Moulded case construction for durability in panel and enclosure installations
• Rated for continuous operation at 40°C ambient

Typical Applications

• Large-scale solar PV array and combiner protection
• Commercial battery energy storage system (BESS) DC protection
• Industrial DC distribution boards
• DC microgrid and power system protection

Technical Specifications

What's Included

• 1 x Onesto KCMD 400 Frame DC MCCB (as per selected current rating and pole configuration)

Please note: Enclosures, mounting accessories and connection cabling are not included and are available separately.

Installation & Compatibility Notes

• Confirm the required current rating and pole configuration before ordering — the rated DC voltage changes with pole count (750VDC for 3 Pole, 1000VDC for 4 Pole).
• Confirm this breaker's voltage rating matches or exceeds your system's maximum DC voltage before installation.
• DC circuit breakers must be connected with correct polarity according to the manufacturer's wiring diagram.
• Breaking capacity is not specified in supplier documentation — contact Zisabo to confirm suitability for your fault-current levels before ordering.
• Installation must be carried out by a suitably qualified electrician or solar installer in accordance with local electrical regulations.

Warranty & Support

This product is supplied with the applicable manufacturer or supplier warranty, subject to correct installation, correct application, and warranty terms.

Zisabo supplies quality plumbing, pump, filtration and electrical products with practical support to help customers choose the correct item for their application. If you are unsure whether this product is suitable, contact us before ordering and our team will assist where possible.

Need help choosing? If you are unsure which current rating or pole configuration is correct for your DC system, contact Zisabo with your application details, system voltage and fault-current requirements, and we will assist where possible.