M1 series moulded case circuit breaker is one of products developed and manufactured by adopting international advanced technology. It is supplied with rated insulating voltage 500 and 800V and used for the circuit of AC 50/60Hz, rated operating voltage AC 400V (or below), rated operating current up to 1 600A for infrequently changing over and starting of the motors. The products conforms to IEC60947-2 standard.






2. Main Technical Specification
Type | Rated Rated | Rated | Rated insul- ating volt- age(V) | Rated operat- ing volt-age(V) | Arcing-ove distance(mm) | Ultimate short circuit breaking capacity (kA) | Service short circuit breaking capacity(kA) | Operation perform-ance | Utiliza-tion cat-egory | |
Load | Unload | |||||||||
M1-63L | (6),10,16, 20,25,32,40,50,63 | 3,4 | 500V | 400V | 0 | 25 | 18 | 1500 | 8500 | A |
M1-63M | 800V | 0 | 50 | 35 | ||||||
M1-125L | (10),16,20,25,32,40,50,63,80,100,125 | 0(≤50) | 35 | 22 | ||||||
M1-125M | 0(≤50) | 50 | 35 | |||||||
M1-250L | 100,125,160, 180,200,225 | ≤50 | 35 | 22 | 1000 | 7000 | ||||
M1-250M | ≤50 | 50 | 35 | |||||||
M1-400L | 225,250,315, 350,400 | ≤50 | 50 | 35 | 1000 | 4000 | ||||
M1-400M | ≤100 | 65 | 42 | |||||||
M1-630L | 400 500 600 | ≤100 | 50 | 35 | ||||||
M1-630M | ≤100 | 65 | 42 | |||||||
M1-800M | 630,700,800 | ≤100 | 75 | 50 | ||||||
M1-1250M | 1000,1250 | ≤100 | 100 150 | 6 80 | ||||||
M1-1600M | 1600 | ≤100 |
3. Protection Characteristic
The thermodynamic release of a circuit breaker provides the feature of inverse time-delay,while the magnetic release is the instantaneous operation as shown on table 2(distribution cir-cuit breaker) and table 3 (motor protection circuit breaker).
Rated current of release (A) | Thermodynamic release( ambient temperature land +40°C marine +45°C ) | Operating current of magnetic release (A) | |
1.05In(cold state) Inoperative time(h) | 1.30In(heat state) Operative time(h) | ||
10≤In≤63 | ≥1 | <1 | 10|n+20% |
63< In≤100 | ≥2 | <2 | |
100< In≤800 | ≥2 | <2 | 5ln+20% 10ln+20% |





