Skip to content CM9N series MCCBs are developed to meet international market demands. With a rated insulation voltage up to 1000V, they are suitable for AC 50/60Hz distribution networks with rated operating voltage up to 690V and current from 10A to 630A.
They provide reliable protection against overload, short circuit, and undervoltage, while also serving power distribution purposes. CM9N breakers feature high breaking capacity, short arcing, and support both vertical and horizontal installation.
Standard: IEC60947-2.
| Type | Operating and Installation Conditions |
| Altitude | ≤2000 m |
| Ambient Temperature | –5°C to +40°C ( +45°C for marine prod ucts) |
| Ambient Conditions | Resistant to damp air, mold, and radiation |
| Mounting Inclination | ≤22.5° |
| Mechanical Vibration | Operates reliably under normal ship vibration |
| Seismic Tolerance | Operates reliably under earthquake (4g) |
| Weather Protection | No direct exposure to rain or snow |
| Atmosphere Requirements | No explosive atmosphere or corrosive/conductive substances present in the ambient air. |
| CM9N | – | 125 | S | P | 3P |
| Model | Frame size | Breaking capacity Icu/lcs(kA) | Operation way | Poles | |
| MCCB | 125 250 400 630 | 125: 15/10 250: 25/18 400: 35/25 630: 35/25 | Default—handle direct operation; P—electric operation Z—rotating handle operation | 3P |
| 300 | 1 | 125A |
| Tripping mode and inner accessory | Application | Rated current(A) |
| The first number indicate release mode 2: only with the instantaneous release device 3: complex release Note: the last two numbers are attachment code (see attachment table) | 1: for distribution 2: for protecting the motor | Frame125: 10,16,20,32,40,50,63,80,100,125 Frame250: 100,125,140,160,180,200,225,250 Frame400: 250,300,315,350,400 Frame630: 400,500,630 |
| Type | Overall size(mm) | |||||||||||
| W | L | H | A | B | W1 | L1 | L2 | H1 | H2 | D | D1 | |
| CM9N-125 | 75 | 130 | 84 | 112 | 25 | 26 | 117 | 75 | 56 | 66 | Φ4 | M6 |
| CM9N-250 | 106 | 165 | 101 | 126 | 35 | 35 | 147 | 97 | 69 | 78 | Φ5 | M8 |
| CM9N-400/630 | 150 | 257 | 150 | 194 | 44 | 48 | 224 | 156 | 102 | 112 | Φ14 | M10 |
