Siemens 3RT20272BB40 Contactor S0 32A

Product Description

The SIEMENS 3RT20272BB40 is a Size S0 IEC-style contactor rated for 32 amps, designed for switching three-phase motors and resistive loads in industrial and commercial control panels. It belongs to the SIRIUS 3RT2 contactor series and provides reliable load-switching performance in motor starters, reversing starters, and direct-on-line applications. The S0 frame size fits standard DIN rail and panel mounting configurations. Weighing 1.415 pounds with a compact footprint, it is well-suited for control enclosures where space and weight are important considerations. Electricians and controls technicians install this contactor as part of motor control centers, machinery panels, and HVAC equipment control circuits.

The 3RT20272BB40 is applied in three-phase motor control applications across commercial HVAC systems, industrial machinery, pump panels, and conveyor controls. The S0 frame is a common IEC standard size used in motor starter assemblies rated up to 32A. The part is typically paired with an appropriate overload relay to form a complete motor starter. This contactor is suitable for both new panel builds and direct replacement of worn or failed S0 frame contactors in existing installations.

Key Features

• 32-amp continuous current rating for three-phase motor and resistive load switching
• IEC Size S0 frame for compatibility with standard motor starter and DIN rail assemblies
• Compact dimensions of 4.272 inches x 2.126 inches x 4.547 inches for space-conscious panel layouts
• Lightweight construction at 1.415 pounds suits high-density control enclosures
• SIRIUS 3RT2 series design for consistent performance in demanding switching cycles

Compatibility

Designed as an IEC Size S0 contactor for three-phase motor control applications. Consult the SIEMENS SIRIUS 3RT2 series documentation to confirm coil voltage and auxiliary contact configuration compatibility with the target control circuit before installation.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC Article 430 for motor branch circuit and control wiring requirements. De-energize and lock out the panel per NFPA 70E lockout/tagout procedures before removing or installing the contactor. Verify coil control voltage matches the available control circuit voltage before energizing. Secure all line, load, and control wiring terminations to the manufacturer-specified torque ranges listed in the product datasheet.

Technical Specifications

• Current Rating: 32 amps
• Frame Size: S0
• Length: 4.272 inches
• Width: 2.126 inches
• Height: 4.547 inches
• Weight: 1.415 pounds
• UPC: 66264391617
• Pack Quantity: 1

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RT20272BB40