Residual current circuit breaker Noark Ex9L-N 2P 40A 30mA

Noark Ex9L-N residual current circuit breaker 2P 40A 30mA is a compact protection device that detects earth leakage and disconnects power to reduce the risk of electric shock and fire. Intended for use in residential and light commercial electrical installations, this two-pole RCCB offers basic residual-current protection with rated current of 40 A and a residual operating sensitivity of 30 mA. The device is compatible with standard DIN-rail distribution boards and intended for integration into circuits where human protection and fire prevention are required.

Advantages

The Noark Ex9L-N provides reliable residual-current detection in a compact two-pole format, combining consistent disconnection performance with straightforward installation on a DIN rail. Its 30 mA sensitivity balances protection for people against unwanted tripping, while the 40 A rated current supports a range of branch circuits commonly found in homes and small commercial premises. The device design prioritizes clear functionality and compatibility with conventional circuit protection schemes.

Suitable for

• Residential main and sub-distribution boards
• Light commercial and office electrical circuits
• Protection of socket and lighting circuits against earth leakage
• Retrofit and new installations requiring residual-current protection

Key specifications

• Poles: 2-pole residual current protection
• Rated current: 40 A
• Residual operating current: 30 mA
• Function: AC-type residual current detection for alternating leakage currents
• Mounting: DIN-rail compatible housing for distribution boards
• Typical applications: human protection and fire-risk reduction in branch circuits

How to use

Install the Noark Ex9L-N on the DIN rail inside the distribution board according to local electrical codes. Connect the incoming supply conductors to the line terminals and the outgoing load conductors to the load terminals, ensuring secure torque on terminal screws and correct polarity. After wiring, test the device by pressing the built-in test button to confirm the breaker trips and then reset it. Commission the protected circuit only after verifying correct operation and ensuring downstream protective devices and loads are compatible with the 40 A rating and 30 mA sensitivity.

Usage recommendations

Use this residual current circuit breaker where 30 mA sensitivity is required for personal protection and where a 40 A rated device matches the circuit load. Periodically test the trip function using the test button at least every three months and follow regional installation standards. Do not use this device as overcurrent protection; combine it with appropriate circuit breakers or fuses sized to protect conductors against overload and short circuit.