Circuit breaker noark 3P C 20A 6kA AC Ex9BN (MPN: NO034)

The noark Ex9BN three-pole circuit breaker C 20A 6kA AC is designed for overcurrent protection in low-voltage AC distribution installations. This compact device offers thermal-magnetic trip characteristics with a C-type instantaneous setting, suitable for general-purpose branch circuit protection. The breaker is intended for DIN-rail mounting in residential, commercial and light industrial panels to protect conductors and connected equipment from overloads and short circuits.

Advantages

The breaker combines a modest footprint with a defined C characteristic that balances inrush tolerance and rapid short-circuit response. Its rated breaking capacity of 6 kA provides reliable interruption performance for common low-voltage systems. The three-pole configuration allows simultaneous isolation of all phases, simplifying installation and enhancing safety. The device's DIN-rail compatibility supports standard electrical distribution panel arrangements.

Suitable for

• Protection of three-phase branch circuits in residential distribution boards
• Overcurrent protection for small commercial installations and light industrial equipment
• Protecting motors and loads with moderate inrush currents where C-type tripping is appropriate
• Retrofits and upgrades in panels using standard DIN-rail components

Key specifications

• Poles: three-pole configuration for three-phase circuits
• Tripping characteristic: C-type thermal-magnetic behaviour
• Rated current: 20 A continuous
• Breaking capacity: 6 kA (AC)
• Mounting: standard DIN-rail compatible
• Application voltage range: suitable for low-voltage AC distribution systems

How to use

Install the circuit breaker on a standard DIN-rail inside an appropriate electrical enclosure following local electrical codes. Connect the three phase conductors and neutral/ground per the system wiring scheme and ensure torque values on terminals meet manufacturer or regulatory recommendations. Verify correct sizing against the circuit's expected load and prospective fault current. After installation, perform insulation and functionality checks, and ensure the breaker trips at estimated overload or short-circuit conditions during commissioning.

Usage recommendations

Use the breaker where a C-type thermal-magnetic characteristic matches the connected equipment's starting currents; verify coordination with upstream and downstream protective devices and confirm the system's prospective short-circuit current does not exceed the breaker's rated capacity.