DC Circuit Breaker

Two-Pole DC Circuit Breaker
Four-Pole DC Circuit Breaker
JB DC Circuit Breaker

Series Part Number

Part Number: JB 16 2 C X
Explanation:

Series

JB - DC circuit breaker

Rated Current

1 - 1A
2 - 2A
3 - 3A
4 - 4A
6 - 6A
10 - 10A
16 - 16A
20 - 20A
25 - 25A
32 - 32A
40 - 40A
50 - 50A
63 - 63A

Number of Poles

1 - 1 pole
2 - 2 poles
3 - 3 poles
4 - 4 poles

Curve

K - K curve
C - C curve
D - D curve

Connection

X - X connection option
NONE - Standard connection option

Description

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.

DC circuit breaker order code
JB ordering code for current rating, pole count, trip curve and connection options.

Main Characteristics

Product type DC miniature circuit breaker
Recommended use Photovoltaic generation, DC distribution and isolation protection
Protection Overload and short-circuit protection
Installation DIN rail mounting
Isolation Suitable for isolation according to IEC/EN 60947-2 requirements

Trip Curves

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

DC circuit breaker C curve
C-curve time-current characteristic for the DC circuit breaker.
DC circuit breaker K curve
K-curve time-current characteristic for the DC circuit breaker.

Wiring and Installation

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

DC circuit breaker wiring diagrams
Wiring diagrams for 1P to 4P breakers, including standard and X connections.
DC circuit breaker installation
DIN rail installation and removal sequence.
DC circuit breaker connection
Terminal tightening, conductor and accessory connection details.

Dimensions

DC circuit breaker dimensions
DC circuit breaker outline and mounting dimensions for the pole configurations shown.

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.

Documents