M9F11216

What type of device is this?

This is a miniature circuit breaker designed for distribution applications. It is a 2-pole thermal-magnetic unit from the Multi9 C60N range, intended to provide overcurrent protection on AC and DC circuits.

What are the main electrical ratings?

The device is rated at 16 A at 50 °C and uses a C trip curve. It is suitable for 50/60 Hz AC networks and also for DC applications. Rated operational voltages include 240 V AC, 415 V AC, 440 V AC and up to 125 V DC.

What breaking capacity does this breaker offer?

Its rated breaking capacity varies by voltage: 10 kA at 415 V AC, 20 kA at 240 V AC, 6 kA at 440 V AC and 20 kA at up to 125 V DC, in accordance with EN/IEC 60947-2.

Is this a single-pole or multi-pole breaker?

It is a 2-pole breaker with 2 protected poles. That makes it suitable for applications where both poles need protection and switching.

What does the C curve mean in practical use?

A C curve breaker is commonly chosen for circuits with moderate inrush current, such as general distribution and many loads that briefly draw a higher current when energised. On this model, the magnetic tripping limit is 8.5 x In +/- 20 % on AC and 12 x In +/- 20 % on DC.

How is it mounted?

The breaker is designed for clip-on mounting on a DIN rail. It occupies 4 x 9 mm pitches, with overall dimensions of 81 mm high, 36 mm wide and 72 mm deep.

What cable sizes can be connected?

It uses tunnel-type terminals at the top or bottom and accepts 1 to 25 mm² conductors. This applies to rigid conductors, flexible conductors and flexible conductors with ferrules.

What installation details should be checked before fitting?

Important connection details include a wire stripping length of 14 mm and a tightening torque of 2 N·m for the top or bottom terminals. Checking these values helps achieve a correct and consistent installation.

Can it be locked in position?

Yes. The breaker is padlockable, which can be useful where the switching position needs to be secured during isolation procedures.

Does it provide isolation as well as protection?

Yes, it is suitable for isolation in accordance with EN/IEC 60947-2. It also includes a contact position indicator and local ON/OFF indication for clear status visibility.

What ingress protection does the unit have?

The device is rated IP20 on its own and IP40 when installed inside a modular enclosure, in line with IEC 60529.

What environmental conditions is it designed for?

It is designed for operation from -30 °C to 70 °C and storage from -40 °C to 80 °C. The unit is rated for 95 % relative humidity at 55 °C, pollution degree 3 and overvoltage category IV.

Is this breaker intended for earth-leakage protection on its own?

No. The datasheet states earth-leakage protection is provided by a separate block, so this breaker itself is primarily for overcurrent protection rather than residual current protection.

What are the durability figures for the mechanism?

This model is rated for 20,000 mechanical operations and 10,000 electrical operations, making it suitable for repeated switching within its intended application range.

What standards does it comply with?

This breaker is specified to EN/IEC 60947-2. If you are listing the exact catalogue reference in your records, the associated model is M9F11216.