Description

The Siemens Sentron 3VM series MCCB is a heavy-duty industrial circuit breaker designed for robust power distribution. When designing technical graphics or detailed visualizations for this component, the nomenclature dictates several critical specifications that are typically printed prominently on the unit’s front fascia:

Key Specifications & Features:

MCCB 4P (Molded Case Circuit Breaker, 4-Pole): A four-pole configuration, meaning the physical model includes four distinct connection terminals on the top and bottom to manage and protect three power phases plus the neutral line.

630A Frame: This indicates the overall physical frame size and the maximum continuous current rating of the device.

TM220 ATFM (Adjustable Thermal, Fixed Magnetic): This dictates the specific trip unit model. Visually, an ATFM breaker features a small rotary dial on the front face, allowing the user to physically adjust the thermal overload protection threshold.

Ir = 440-630A: This represents the precise range for that thermal adjustment dial, allowing the operating trip threshold to be set anywhere from 440 amps up to the maximum 630 amps.

55kA @ 415V: The short-circuit breaking capacity. It denotes that the device can safely interrupt a massive 55,000-amp fault current when operating within a standard 415V AC electrical system.