Siemens SIRIUS 3RT2 Contactor 38A, 18.5kW, 24V DC, 2NO+2NC, S0 Original Brand New

Overview: Siemens SIRIUS 3RT2028-1BB44-3MA0 Power Contactor

The Siemens 3RT2028-1BB44-3MA0 is a high-performance 3-pole power contactor from the SIRIUS 3RT2 family, engineered for switching motors and general resistive loads up to $18.5\text{ kW}$ at $400\text{ V}$ (AC-3e/AC-3 rated current $38\text{ A}$).

This robust industrial contactor features a reliable $24\text{ V DC}$ control coil, ensuring consistent operation in demanding applications. Its compact Size S0 footprint allows for efficient use of panel space. The unit is equipped with integrated, captive auxiliary contacts ($2\text{ NO}+2\text{ NC}$) and utilizes secure screw terminals for main and auxiliary circuits. Designed with a captive auxiliary switch for specific safety applications (e.g., SUVA), it is a dedicated component without a retrofittable surge suppressor.

Benefit

• Reliable Performance: Part of the globally trusted Siemens SIRIUS family, ensuring long mechanical and electrical service life.
• Space-Saving: Compact Size S0 footprint allows for higher density installations in control cabinets.
• Integrated Design: Captive $2\text{ NO}+2\text{ NC}$ auxiliary contacts simplify wiring and reduce installation time by eliminating the need for separate contact blocks.
• Secure Wiring: Robust screw terminals offer easy installation and secure, maintenance-free connections.
• Active Product: Currently an active Siemens product, guaranteeing long-term availability and support.

Typical Application

Ideal for use in low-voltage switchgear and control systems for:

• Switching three-phase motors (AC-3/AC-3e)
• Controlling resistive loads
• Integration into starter combinations (DOL, Reversing)
• General industrial machine control

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