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Siemens 3RT1944-5AH02 — Contactors

Siemens 3RT1944-5AH02 SIRIUS Magnet Coil, 48 V AC 50 Hz

MPN3RT1944-5AH02

Siemens SIRIUS, Magnet coil for contactors Size S3, spring-loaded connection technology, 48 V AC 50 Hz, 0.8... 1.1 operating range.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT1944-5AH02 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz48 V

Product details

The Siemens 3RT1944-5AH02 is a SIRIUS magnet coil designed for Size S3 contactors, using spring-loaded connection technology. It's the replacement coil for a contactor that's lost its pull-in — common failure point on a line that's been cycling hard. Coil voltage is 48 V AC at 50 Hz, with an operating range of 0.8... 1.1 times rated voltage — meaning it pulls in reliably down to about 38.4 V and holds in up to 52.8 V, which gives you a decent margin on a sagging control transformer.

Integration note — Size S3 contactor family

This coil mates with the SIRIUS Size S3 contactor frame. Make sure your control supply is 50 Hz; this coil is not rated for 60 Hz operation.

Frequently asked questions

Where can I buy 3RT1944-5AH02 and get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ to get a firm price and lead time for your quantity.

What is the closest functional second-source for 3RT1944-5AH02?

The closest functional second-source is the SIRIUS 3RT2 series, which is the official successor. For a drop-in replacement on an existing Size S3 contactor, the 3RT1944-5AH02 is the correct service part. The 3RT1017-1AD02 is a different size (S00) and will not fit the S3 frame without mechanical modification.

What is 3RT1944-5AH02's operating range at 50 Hz?

The operating range at 50 Hz is 0.8... 1.1 times the rated voltage. For the 48 V AC coil, that means it pulls in reliably down to approximately 38.4 V and holds in up to approximately 52.8 V.

Will 3RT1944-5AH02 drop into a panel specified around 3RT1017-1AD02?

No. The 3RT1944-5AH02 is a magnet coil for Size S3 contactors, while the 3RT1017-1AD02 is a complete power contactor in Size S00. The coil will not physically fit the S00 frame, and the S00 contactor uses a different coil part number. You would need the correct coil for the S00 contactor, not this S3 coil.

MPN
3RT1944-5AH02