3P 5A 10A 20A Molded Case Circuit Breaker

In industrial control, laboratory equipment, or precision instruments, there are a large number of three-phase loads with rated power below several kilowatts. These devices are extremely sensitive to overcurrent anomalies, and general medium to high current circuit breakers cannot provide precise protection. The SPX advanced 3P 5A 10A 20A Molded Case Circuit Breaker series is designed specifically for such intricate scenes. It is like a dedicated 'three-phase balance monitor', which independently monitors and protects the current of three phase lines. Whether it is a small overload or a sudden short circuit, it can be quickly identified and cut off, providing meticulous safety protection for delicate three-phase equipment.

Features:

Customized 3P 5A 10A 20A Molded Case Circuit Breaker provides three closely connected current levels of 5A, 10A, and 20A, allowing engineers to select based on the precise rated current of the load, achieving the best match between protection characteristics and load characteristics, and avoiding protection blind spots or excessive sensitivity caused by "big horses pulling small cars".
If any phase experiences overload or short circuit, the circuit breaker will synchronously cut off all three poles, fundamentally eliminating the risk of phase loss operation, which is crucial for protecting three-phase motors and symmetrical loads.
Compared to using three single pole circuit breakers, it saves installation space and wiring complexity.
The high quality 3P 5A 10A 20A Molded Case Circuit Breaker is suitable for systems with AC 50/60Hz and rated voltage up to 400V or 690V, meeting various low-voltage three-phase distribution environments.

Selection

1. Refer to the rated current on the equipment nameplate and select a circuit breaker rated current slightly greater than (usually 1.1-1.25 times) this value. For motor loads, it is necessary to confirm that their starting current is within the instantaneous tripping range of the circuit breaker (such as D-type characteristics) to avoid false tripping.
2. As the end protection, 3P 5A 10A 20A Molded Case Circuit Breaker needs to make sure selective protection with the previous level distribution circuit breaker (such as 32A, 63A). Its smaller rated current and fast operating characteristics can usually achieve this goal well.
3. Environmental factors: If installed in a confined space or high temperature environment, consideration should be given to the use of current derating.

The SPX SM30-30 series of moulded case circuit breaker MCCB Parameter

Frame(A)		SM30-30(NF-CW)				Operating characteristics
Rated current in(A)		(2)、3、(3.2)、5、10、15、20、30
Rated voltage(V)		AC 400V
Rated insulation voltage(V)		AC 500V
Number of poles		2		3
Limited breaking capacity		C	S	C	S
Short circuit interruptingcapacity(kA) AC400V		1.5	1.5	1.5	1.5
Operate short circuit(kA) AC400V		1	1	1	1
Profile picture
	a	96		96
	b	45		67
	c	64		64
Mounting picture
	d	84.5		84.5
	e	/		24
	f	5		5
Machine life		7000
Electrical life		4000
Electrical-operation device(MD)
Extemal rotary handle
Automatic tripping device		Thermal-magnetic

Front view