Siemens Industrial Controls 3RT2026-1BB40 Contactor R-448A or remote alarms—simultaneously with the

or remote alarms—simultaneously with the main motor or compressor

Its robust internal construction is specifically optimized for the thermodynamic properties of HCFC-22

or after a major compressor burnout to ensure no acidic oil or debris from the previous failure remains in the suction line

one circuit handles the heavy-duty motor load (Line-M2) for the compressor

A compromised diaphragm leads to air leaks

Siemens Industrial Controls 3RT2026-1BB40 Contactor R-448A or remote alarms—simultaneously with theThe Siemens Sirius 3RT2026 1BB40 Contactor is a heavy duty S0 size power contactor engineered for demanding motor control and industrial HVACR automation. Operating on a 24VDC control coil, this 3 pole device maintains a 25A AC 3 rating at 400V, providing a power delivery capacity of up to 11kW. Built for high cycle reliability in panel mount or 35mm DIN rail configurations, the 3RT2026 1BB40 features two integrated auxiliary contacts (1 NO + 1 NC)