Chassis for MasterPacT MTZ2 – what it carries
The LV848399 is the drawout chassis for a MasterPacT MTZ2 08-16 air circuit breaker, rated 1600 A at 40 °C in a 3-pole configuration. It is the frame that accepts the breaker cradle — you mount the breaker into this chassis, not the other way around. The drawout mechanism lets you rack the breaker between connected, test, and disconnected positions without unbolting power cables, which matters for routine maintenance and isolation on a 1600 A bus. Physical footprint: 441 mm wide, 439 mm high, 403 mm deep. Plan your enclosure cutout and cable-entry clearance around those numbers — the depth in particular needs room behind the chassis for the drawout travel and the rear power connections.
What the L1 performance level tells you
The designation on this chassis refers to the mechanical performance level for the drawout mechanism, not a breaker trip curve. It defines the number of racking operations the chassis is designed to withstand under load — is the standard duty level for MasterPacT MTZ2, suitable for normal switching and maintenance cycles in distribution and motor control centers. If your application requires frequent racking under high fault currents, check whether the next level (L2) is specified on your breaker order.
Drawout mounting means the chassis bolts into the enclosure frame, and the breaker slides in on telescopic rails. The chassis carries the primary disconnect contacts, the control wiring plug, and the racking mechanism. Verify the enclosure depth — 403 mm is the chassis-only dimension; add clearance for the breaker body when racked out and for the rear bus connections. The 3-pole configuration matches the standard three-phase distribution bus.