MCCB for line protection with communication and auxiliary switching
Its interrupting capacity reaches 187 kA at 240 V and 121 kA at 415 V and 440 V, which means it can safely clear high-fault currents on the secondary side of a large transformer or at a main service entrance without upstream coordination failure.
Interrupting ratings and selectivity planning
This MCCB carries a 160 A frame with a 1 600 A maximum trip setting range, giving the site electrical engineer room to dial in the long-time pickup between 240 A and 1 600 A for selective coordination with downstream breakers. The interrupting ratings step down with voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. At typical 400 V industrial feeds, the 121 kA SCCR covers most utility transformer secondary faults without requiring a current-limiting fuse upstream.
Panel integration and auxiliary wiring
The auxiliary switches share the same mechanism as the main contacts; verify the free-wheel diode polarity on the UVR coil before energizing to avoid damaging the release.
Thermal performance across ambient range
Maximum power loss is 28 W at rated current.