Switch Disconnector for Isolation and Disconnect Duty
It is built for isolation and disconnect applications where overload and short-circuit protection are handled upstream or by separate devices — per the product description, it carries no overload or short-circuit protection elements. The rated insulation voltage Ui is 800 V, with a maximum operational voltage of 690 V AC 50/60 Hz and 600 V DC. The front face is IP40 rated, suitable for installation in a panel with a sealed enclosure.
The 250 A rated continuous current (Iu) means this disconnector is sized for a 250 A feeder or load circuit — typical for a large motor control centre, a distribution sub-feed, or a main disconnect on a machine. The busbar connection on the front terminals is designed for direct bolting to busbar systems, common in switchgear and panelboard installations.
The disconnector occupies a 140 mm width, 158 mm height, and 70 mm depth footprint — these dimensions are for the MCCB-style housing, which mounts via the front panel cut-out or a dedicated mounting plate (not DIN rail). The busbar connection on the front terminals requires busbar drilling and bolt torque per Siemens installation instructions. The maximum power loss of 57 W at rated current should be factored into the panel thermal budget.