Siemens 3RT20351NB30 Contactor S2 40A

Product Description

The SIEMENS 3RT20351NB30 is a Size S2 definite-purpose contactor rated at 40 amps, designed for switching and controlling three-phase motor loads and resistive circuits in industrial and commercial electrical systems. Built to IEC standards, this contactor provides reliable power switching in motor control centers, panel boards, and machine control cabinets. The S2 frame size indicates a mid-range physical footprint suited to applications where compact panel space is a priority without sacrificing current-handling capacity. Licensed electricians and industrial controls technicians are the primary installers of this device.

The 3RT20351NB30 is suited for three-phase motor control applications in commercial buildings, light industrial facilities, and process equipment. Typical installations include motor starters, reversing contactor assemblies, and multi-contactor control panels where reliable load switching at 40 amps is required. The S2 frame size fits standard DIN rail and direct mounting arrangements common in IEC-style control panel builds.

Key Features

• 40-amp continuous current rating for motor and resistive load switching
• IEC Size S2 frame for compact panel integration
• Suitable for three-phase motor control center and machine control applications
• DIN rail and direct panel mount compatible per S2 frame standard

Compatibility

Designed as an IEC-style S2 frame contactor for use in three-phase motor control and industrial switching applications where a 40-amp rated device is required.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NFPA 70 (NEC) and any applicable local codes. De-energize and lock out the panel or motor control center before installing or wiring the contactor. Verify coil voltage matches the control circuit supply before energizing. Do not exceed the published current rating for the application.