Siemens 3RT29445AT61 Magnet Coil for 3RT2 Contactors

System Integration Context

The 3RT29445AT61 magnet coil attaches directly to SIRIUS 3RT2 contactor bodies, energizing the electromagnet that closes the contactor's main poles. In a motor control cabinet, this coil is the sole electrical interface between the control circuit (typically 120V class) and the power switching element — the coil receives the command signal and mechanically drives the contactor armature.

This particular coil carries a 600 VAC 60 Hz rating, placing it in the upper portion of the standard IEC/UL coil voltage range for North American control applications.

Technical Specifications

The 600 VAC 60 Hz rating is encoded in the "AT61" portion of the MPN string — "T" designates the 600V class for 60Hz systems, a common selection for North American 480V and 600V motor branch applications where the control transformer secondary matches the coil voltage.

Coil Voltage Selection Logic

The SIRIUS 3RT2 coil family spans multiple voltage options within the same mechanical package:

All share the same 3RT2944 base, box encapsulation, and contactor compatibility — only the voltage class differs.

Mechanical and Environmental Notes

All coils in this series use box-style encapsulation, which provides environmental protection for the windings. The package type and encapsulation method are consistent across voltage variants, simplifying stock planning for panel builders who support multiple control voltage systems.

The 3RT2944 base product number ties this coil to size-4 contactors, which in the SIRIUS portfolio typically correspond to motor load ratings from approximately 9 A to 12 A (AC-3 duty at 400V), though the coil itself does not carry a current rating — that spec lives with the contactor body.

In-Catalog Comparison: 3RT29445AT61 vs. Related Voltage Variants

All listed alternates share the identical base product number, series, accessory type, encapsulation, and package type. The sole differentiating attribute is coil voltage.

The 480V variant (3RT29445AV61) shares the same 60Hz designation and sits closest in the voltage hierarchy to the 600V primary. The 220V/230V variants (3RT29445AP61, 3RT29445AP01, 3RT29445AL21) serve 50Hz markets or dual-frequency applications. The 110V and 24V options serve lower-voltage control transformer secondaries common in European or small-panel installations.

No in-catalog alternates carry different base product numbers — the voltage selection is the only axis of variation across this family.

FAQ

Does the 3RT29445AT61 coil work with all SIRIUS contactor sizes? The base product number 3RT2944 associates this coil with size-4 contactors in the SIRIUS 3RT2 family. Compatibility with other frame sizes requires the corresponding coil variant for that base number.

Can this 600V coil be used on a 480V system? The coil voltage rating must match the control circuit voltage. Applying a 600V-class coil on a 480V control circuit may result in insufficient magnetic pull — verification against the specific control transformer secondary voltage is required before selection.

Are the 480V and 600V variants drop-in replacements for each other? They share the same mechanical interface and base product number, but coil voltage is application-specific. Selection must match the installed control circuit voltage.