MM8 plastic shell circuit breaker-Mueller Electric (Group) Co., Ltd

The (double breakpoint) plastic shell circuit breaker product launched by our company is a new product for the development needs of low-voltage distribution Internet of Things. This series of products has a number of independent innovation technologies of our company, with the following main features:

Comprehensive protection: fully selective three-stage current protection, four-stage current protection, reliable breakdown of fault current;

High reliability: Modular design: Each pole contact does not interfere with each other, and the trip unit is modular and perfectly interchangeable.

Excellent current limiting characteristics: limit short-circuit current to a great extent, thereby reducing the damage to the system by short-circuit current. When large short-circuit current is disconnected, the repulsive contacts operate before the tripping device and quickly cut off.

Model meaning

Codename	project	Codename	project
①	Company code: Shanghai Muller	⑤	Rated current: 100, 160, 250, 400, 630
②	Product code: Plastic housing circuit breaker	⑥	Dividing ability: M, H, R
③	Design code: 8	⑦	Number of poles: 3P, 4P
④	None: electromagnetic type, i: electronic type

Main technical parameters

Specifications and models	MM8□-100			MM8□-160			MM8□-250			MM8□-400			MM8□-630
Rated current In(A)	40～100A			63～160A			100～250A			160～400A			250～630A
Pole number	3/4
Rated insulation voltage Ui(V)	1140
Rated impact withstand voltage Uimp(kV)	8			8			8			12			12
Rated operating voltage Ue(V)	AC400
Rated operating frequency (Hz)	50
Arc distance (mm)	0
Short circuit breaking capability level	M-type	Type H	Type R	M-type	Type H	Type R	M-type	Type H	Type R	M-type	Type H	Type R	M-type	Type H	Type R
Rated limit short circuit breaking capability Icu(kA)	35	50	70	35	50	70	35	50	70	50	75	100	50	75	100
Rated short circuit breaking capability Ics(kA)	35	50	70	35	50	70	35	50	70	50	75	100	50	75	100
Use Category	Class B
Rated short-term withstand current Icw(kA)	10kA/1s			10kA/1s			10kA/1s			15kA/1s			15kA/1s
Mechanical life (times)	30000			30000			30000			20000			20000
Electrical life (times)	15000			15000			15000			10000			10000

Appearance and installation dimensions

model	External dimensions
MM8□	A1	A2	B1	B2	C1	F1	F2	F3
100/160/250	161	178.5	52.5	140	126	35	17.5	70
400/630	225	237	70	185	168	45	22.5	90