MCCB 3P 40A 50A Molded Case Circuit Breaker

In the power distribution network of industrial production lines, commercial centers, or buildings, there are a large number of three-phase loads with rated currents in the range of 40-50 amperes. These loads typically serve as critical nodes in the system, placing higher demands on the reliability, selectivity, and flexibility of protection. The high quality MCCB 3P 40A 50A Molded Case Circuit Breaker manufacutured by SPX is a professional grade product designed for such core circuits. It goes beyond the basic protection breaking function and introduces adjustable protection settings and higher breaking capacity, like a discerning "power dispatcher". It can not only eliminate faults, but also achieve selective cooperation with upper and lower level protection equipment by adjusting protection thresholds and delays, maximizing power supply continuity.

Advantage

The adjustable feature enables it to protect stable three-phase heating equipment and adapt to three-phase motor loads with certain starting shocks, making it more widely applicable.
It usually has a high breaking capacity of 25kA to 50kA, which can effectively cut off and withstand the expected short-circuit current that occurs in the distribution box, ensuring that the fault does not spread to the higher-level power grid.
The operating mechanism is sturdy and provides clear indication of the "on", "off", and "off" positions. When the CE-certified MCCB 3P 40A 50A Molded Case Circuit Breaker is disconnected, a visible three-phase safety isolation breakpoint is formed, fully meeting the electrical safety specifications for equipment maintenance.
The three pole integrated structure saves a lot of space compared to separate installation.

Application

As an incoming power protection and isolation switch for CNC machine tools, medium-sized pump units, air handling units, and packaging machinery.
In the power distribution cabinet of the workshop or building, high quality MCCB 3P 40A 50A Molded Case Circuit Breaker provides branch protection for an area or a group of equipment.
Protect the driving power supply for small and medium-sized central air conditioning units, mall elevators, and kitchen three-phase power equipment.
MCCB 3P 40A 50A Molded Case Circuit Breaker Used for the protection of the three AC combiner box or inverter output terminal in small and medium-sized photovoltaic power plants.

The SPX SM30-63 series of Thermal Magnetic Circuit Breakers Parameter

Frame(A)		SM30-63(NF-CW)						Operating characteristics
Rated current in(A)		3、6、10、16、20、25、32、40、50、63
Rated voltage(V)		AC 400V
Rated insulation voltage(V)		AC 500V
Number of poles		2			3
Limited breaking capacity		C	S	H	C	S	H
Short circuit interruptingcapacity(kA) AC400V		5	5	10	5	5	10
Operate short circuit(kA) AC400V		2	2	5	2	2	5
Profile picture
	a	130			130
	b	50			74
	c	88			88
Mounting picture
	d	110			110
	e	/			25
	f	5			5
Machine life		7000
Electrical life		4000
Electrical-operation device(MD)
Extemal rotary handle
Automatic tripping device		Hydraulic-magnetic

Front view

Thermal Magnetic Circuit Breakers Side view