SM30-400 3p 4p molded case circuit breaker

3p 4p molded case circuit breakerv Both have overload and short-circuit protection functions, which can effectively prevent failures caused by circuit overload and protect equipment and personnel safety. These protection functions are key to ensuring the stable operation of the power system.

Made of plastic shell material, it has good insulation performance and corrosion resistance, suitable for use in various environments, ensuring long-term stable operation. The design of the plastic shell not only improves safety, but also reduces maintenance costs.

Suitable for different current levels and applications, able to meet a variety of industrial and commercial needs. Whether in high-current industrial applications or low-current commercial environments, 3P and 4P circuit breakers can provide reliable protection.

Product Details

Product Description

3P and 4P molded case circuit breakers refer to three-phase and four-phase molded case circuit breakers. Their main differences lie in the number of circuit phases and application scenarios.

3P molded case circuit breaker:

Suitable for three-phase circuits, usually used to protect three-phase loads such as motors, transformers and other industrial equipment. This circuit breaker can effectively monitor and control three-phase current to ensure the safe and stable operation of the equipment.

It has three main contacts, which can cut off the three-phase power supply at the same time, ensuring rapid power outage in the event of a fault, preventing equipment damage or fire and other safety hazards.

Commonly used in industrial equipment, power distribution cabinets, mechanical equipment and other occasions, widely used in manufacturing, construction and other industries that require a stable power supply. In addition, the design of 3P circuit breakers usually takes into account the needs of high loads and frequent operations to ensure its reliability in harsh environments.

4P molded case circuit breaker:

Suitable for three-phase four-wire circuits, usually used to protect three-phase loads and neutral lines. This type of circuit breaker plays a vital role in power systems, especially in situations where a neutral line is required, such as the access of single-phase loads.

It has four main contacts, which can cut off the three-phase power supply and the neutral line at the same time, ensuring that all related currents can be safely cut off when a circuit fails, further improving the safety and stability of the system.

Commonly used in situations where a neutral line is required, such as certain types of power distribution systems and equipment, especially in commercial buildings and large industrial facilities. The design of the 4P circuit breaker also takes into account the situation of current imbalance, which can effectively prevent equipment damage caused by neutral line faults.

When choosing a 3P or 4P circuit breaker, you need to decide based on the specific circuit requirements and load types. Considering the complexity and diversity of the power system, choosing the right circuit breaker can not only improve the safety of the system, but also improve the operating efficiency and reliability of the equipment. Make sure that the selected circuit breaker meets the relevant electrical standards and specifications to ensure the safety and stability of the system.

The SPX SM30-400 Series Of Moulded Case Circuit Breaker MCCB Parameter

Frame(A)		SM30-400(NF-CW)						Operating characteristics
Rated current in(A)		250、300、315、350、400
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 interrupting circuit(kA) AC400V		25	35	50	25	35	50
Operate short circuit(kA) AC400V		15	20	25	15	20	25
Profile picture
	a	258			258
	b	140			185
	c	153			153
Mounting picture
	d	195			195
	e	45			45
	f	8			8
Machine life		4000
Electrical life		1500
Electrical-operation device(MD)		●
Extemal rotary handle		●
Automatic tripping device		Thermal-magnetic