3RT1945-5AC21

The Siemens 3RT1945-5AC21 is a dedicated operating coil for large S3-size contactors, rated at 24V AC, 50/60Hz. It is also compatible with 3RT1045 and 3RT1046 models. It can be replaced without disassembling the entire contactor. Kenxin Motor provides original factory genuine product verification.

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Siemens 3RT1945-5AC21 coil, 24V AC, for use with 3RT1045/3RT1046 S3 contactors.

Product Positioning

The 3RT1945-5AC21 is the operating coil for Siemens SIRIUS large 3RT10 series contactors. It has a rated voltage of AC 24V and a frequency of 50/60Hz, and is suitable for the operating mechanisms of 3RT1045 and 3RT1046 contactors (both S3 size). This coil can be directly replaced without removing the contactor from the control panel, providing a low-cost solution for maintaining older machines. Kenxin Motors is an authorized Siemens distributor, providing genuine Siemens products and alternative recommendations.

Core Product Advantages and Features

24V low voltage AC specification

Rated voltage 24V, frequency 50/60Hz, suitable for safe low-voltage control circuits.

Cross-model compatibility

Both 3RT1045 and 3RT1046 S3 size contactors are compatible.

Replacement without disassembly

The coil can be replaced directly without removing the contactor from the distribution panel.

Reduce maintenance costs

Replacing the coil is more economical than replacing the entire contactor.

Kenxin Motors guarantees genuine products

Authorized Siemens distributor, providing genuine products and inventory tracking.

project	Specification
model	3RT1945-5AC21
Product Type	Contactor operating coil
Rated voltage	AC 24V
Rated frequency	50/60 Hz
Applicable product series	SIRIUS 3RT10 Large Contactor
Applicable models	3RT1045 and 3RT1046 (both S3 size)
Original brand	Siemens
Product Status	The original manufacturer has listed it as obsolete; we recommend inquiring about alternative solutions.

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