4P 200A Molded Case Circuit Breaker

In modern commercial buildings, data centers, and industrial environments that use a large number of single-phase nonlinear loads, traditional three pole circuit breakers are no longer able to meet all the requirements for safe isolation. The birth of the SPX high-quality 4P 200A Molded Case Circuit Breaker lies in achieving complete isolation and control of live conductors. It not only protects three-phase lines, but also uses its crucial fourth pole (N-pole) to disconnect and isolate neutral lines, fundamentally solving equipment damage, fire risks, and personnel electric shock hazards caused by neutral line electrification, potential drift, or fault currents. It is a strategic choice to address complex power supply quality and high safety standards requirements.

Advantage

In the disconnected state, it can simultaneously cut off all phase and neutral wires, providing the highest level of safety guarantee for backend equipment maintenance and line inspection, fully complying with the strict requirements for isolation integrity in grounding systems such as TN-S and TT.
In situations where three-phase loads are severely unbalanced or third harmonic currents are significant (such as large LED lighting, IT equipment clusters), the neutral line may carry abnormal currents. The 4P 200A Molded Case Circuit Breaker ensures that the neutral and phase lines are synchronously cut off in the event of overload or short circuit faults, preventing the N line from overheating and causing a fire.
If any pole fails (including the N pole), the circuit breaker will be interlocked with four poles to ensure that the faulty circuit is completely isolated.
The protection function of the N-pole can be configured according to standards and application requirements, commonly known as full protection type (with the same rated current and protection characteristics as the phase pole) or adjustable type, to adapt to different system grounding and protection coordination requirements.
When equipped with electronic release devices, precise short delay settings can be used to achieve complete selective coordination with lower level three or four pole protection equipment, ensuring power supply continuity.
The design and material selection of the high quality 4P 200A Molded Case Circuit Breaker take into account the possibility of high-order harmonic currents in the neutral line, ensuring long-term stability during operation.
The durable 4P 200A Molded Case Circuit Breaker uses contact materials, arc extinguishing systems, and insulation frames of the same grade as high-quality three pole MCCBs, ensuring mechanical and electrical durability under four pole synchronous operation.

Application

The 4P 200A Molded Case Circuit Breaker in stock serves as the main incoming circuit breaker for large shopping malls, office buildings, and hotels under the TN-S system, meeting the safety regulations that require the main switch to disconnect all live conductors.
Provide incoming line protection and synchronous protection of neutral lines for the column cabinets in computer rooms with a large number of single-phase servers that cause serious three-phase imbalance and harmonic distortion.
The main switch for power distribution in hospital operating rooms, laboratories, and large stage lighting and sound systems is designed to prevent overheating caused by the superposition of 3rd harmonic on the neutral line.
The 4P 200A Molded Case Circuit Breaker, as the upper level protection device of the dual power transfer switch (ATSE), can also isolate the neutral line absolutely when switching between two power sources, avoiding accidental parallel connection of neutral lines in different systems.

The SPX SM30-250 series of MCCB Thermal Magnetic Parameter

Frame(A)		SM30-250(NF-CW)						Operating characteristics
Rated current in(A)		100、125、140、150、160、175、200、225、250
Rated voltage(V)		AC 400V
Rated insulation voltage(V)		AC 690V
Number of poles		3			4
Limited breaking capacity		C	S	H	C	S	H
Short circuit interruptingcapacity(kA) AC400V		18	30	50	18	30	50
Operate short circuit(kA) AC400V		9	15	25	9	15	25
Profile picture
	a	165			165
	b	105			140
	c	90			90
Mounting picture
	d	126			126
	e	35			35
	f	5			5
Machine life		4000
Electrical life		2000
Electrical-operation device(MD)		●
Extemal rotary handle		●
Automatic tripping device		Thermal-magnetic

Front view