DC Circuit Breaker

The JB series DC miniature circuit breaker is designed for multi-string photovoltaic systems and other DC distribution circuits. It provides reliable circuit isolation and overload or short-circuit protection on the DC side of an installation.

Typical Applications

• Solar PV combiner boxes and inverter input protection
• DC distribution panels and battery systems
• Auxiliary DC control and protection circuits

Key Features

• Non-polarity-sensitive design: positive and negative conductors can be reversed without risk.
• Clear contact position indication for safe isolation work.
• Fast closing mechanism, independent of toggle actuation speed, for longer service life.
• Pre-wired input and output arrangement on the same side for easier installation.

Selection Guide

Use the order-code chart below to select pole count, rated current, curve type and other options.

Main Characteristics

Trip Curves

C curve and K curve diagrams help match the breaker response to the expected load profile.

Wiring and Installation

The diagrams below show wiring, installation position and connection details for practical panel assembly.

Dimensions

Notes

• Fast fault clearing on site is required to maintain installation safety.
• Confirm current rating, pole configuration and trip curve against the application before ordering.