Scope of Application
The QKM7 series Molded Case Circuit Breakers (here in after referred to as the circuit breakers) have a rated insulation voltage of 1000V and are suitable for circuits with AC 50Hz/60Hz, rated operational voltages of 400V/690V, and rated operational currents from 25A to 800A. They are intended for infrequent switching and infrequent starting of motors. The circuit breakers provide overload, short-circuit, and undervoltage protection, safeguarding lines and power supply equipment from damage.
The circuit breakers feature a compact size, high breaking capacity, short arcing distance, and vibration resistance. They can be installed vertically (upright mounting) or horizontally (side mounting) and provide isolation functionality. Accessories are modularized and can be installed independently on-site. The circuit breakers comply with the standard: GB/T 14048.2 “Low-voltage switchgear and controlgear – Part 2: Circuit-breakers”.
Overall Dimensions & Mounting Dimensions
| Product Model | L | W (SP) | W1 (4P) | H | L1 | L2 | W2 | H1 | H2 | H3 | H4 | H5 | a | a1 | b | φd |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 125L | 130 | 75 | 100 | 81.5 | 115 | 83 | 25 | 56 | 66 | 69 | 23.5 | 23.5 | 25 | 50 | 111 | 4.5 |
| 125M/H | 150 | 92 | 122 | 111.5 | 132 | 88 | 30 | 81 | 91 | 97 | 28 | 28 | 30 | 60 | 129 | 4.5 |
| 250L | 165 | 107 | 142 | 94.5 | 144 | 102 | 35 | 62 | 74 | 78 | 21 | 21 | 35 | 70 | 126 | 4.5 |
| 250M/H | 165 | 107 | 142 | 112 | 144 | 102 | 35 | 80 | 92 | 97 | 21 | 21 | 35 | 70 | 126 | 4.5 |
| 400L/M/H | 257 | 150 | 198 | 146 | 224 | 150 | 48 | 96 | 107 | 113 | 35 | 35 | 44 | 94 | 215 | 6 |
| 630L/M/H | 257 | 150 | 198 | 146 | 224 | 150 | 48 | 96 | 107 | 113 | 37 | 37 | 44 | 94 | 215 | 6 |
| 800L/M/H | 280 | 210 | 280 | 155 | 243 | 204.5 | 70 | 102 | 39 | 121 | 39 | 40 | 70 | 140 | 243 | 7 |
Note: Dimensions are in millimeters (mm).
SP: Single-Pole
4P: Four-Pole