M9F43335

What type of circuit breaker is this?

The M9F43335 is a Multi9 C60BP miniature circuit breaker designed for AC distribution circuits. It has three protected poles, a 35 A rated current and a D-curve thermal-magnetic trip mechanism.

What protection does the thermal-magnetic trip mechanism provide?

The thermal element responds to sustained overloads, while the magnetic element responds to high short-circuit currents. This combines overload and short-circuit protection in one device.

What are the D-curve tripping characteristics?

The specified magnetic tripping limit is 12 times the rated current, with a tolerance of ±20% for AC operation. This characteristic allows brief starting-current peaks, although suitability must be assessed against the connected equipment and circuit requirements.

What AC voltage ratings are specified?

The rated operational voltages are 240 V, 415 V and 440 V AC at 50/60 Hz. A separate UL 489 interrupting rating is specified for 480Y/277 V AC systems. The applicable voltage, system configuration and approval requirements must be checked for each installation.

What is the short-circuit breaking capacity?

Under EN/IEC 60947-2, the ultimate short-circuit breaking capacity is 20 kA at 240 V AC, 10 kA at 415 V AC and 6 kA at 440 V AC. Under UL 489, the interrupting rating is 14 kA at 240 V AC and 10 kA at 480Y/277 V AC.

How is the circuit breaker mounted, and what are its dimensions?

It uses a clip-on DIN rail mounting arrangement. The body measures 103 mm high, 54 mm wide and 72 mm deep, occupying six 9 mm pitches.

Does this circuit breaker provide earth-leakage protection?

No. The M9F43335 does not include earth-leakage protection. Where residual-current protection is required, it must be provided separately using equipment suitable for the installation.

Which conductor sizes do the terminals accept?

The top and bottom tunnel terminals accept rigid conductors from 1 to 35 mm². Flexible conductors, with or without ferrules, are supported from 1 to 25 mm².

What operating temperature and altitude limits are specified?

The specified operating temperature range is −30 °C to +70 °C, with an operating altitude range of 0 to 2,000 m. The 35 A current rating is stated at a reference temperature of 25 °C; operating temperature limits should not be interpreted as confirmation of full-current performance throughout the range.

What ingress protection ratings apply?

The circuit breaker is rated IP20. An IP40 rating is specified when it is installed in an appropriate modular enclosure. The enclosure arrangement must therefore be considered when assessing protection for the installation environment.

Which standards are listed for this circuit breaker?

The listed standards are EN/IEC 60947-2, UL 489, CSA C22.2 No. 5 and GB 14048.2. Ratings differ by standard and operating voltage, so the relevant combination should be checked against the application requirements.

What switching endurance is specified?

The specified mechanical durability is 20,000 operating cycles, while electrical durability is 10,000 operating cycles. These are distinct endurance ratings rather than a prediction of operating life in a particular installation.