The Siemens SIRIUS 3RT1935-5AH01 is a 48 V AC magnet coil for Size S2 contactors, terminated with screw terminals. It's the drop-in replacement coil for any SIRIUS S2 frame — if the contactor body is good but the coil is open or shorted, this is the part that goes back in without modifying the panel wiring. Rated coil voltage is 48 V AC at 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage — so it picks up reliably down to about 38.4 V and holds in up to 52.8 V. That's a standard ±20% tolerance band for industrial contactor coils; anything outside that and you're looking at a weak pull-in or a burned coil.
Siemens 3RT1935-5AH01 SIRIUS Magnet Coil, 48 V AC, 50 Hz
MPN3RT1935-5AH01
Siemens SIRIUS, magnet coil, 3RT1935-5AH01, 48 V AC at 50 Hz, screw terminal, for Size S2 contactors.
$13.82Ref. price · indicative, final on quote
Source DocumentedChannel stated on listing & quote
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Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Control supply voltage type | AC |
| Rated value @ 50 Hz | 0.8 ... 1.1 |
| Rated value @ 50 Hz | 48 V |
Product details
Frequently asked questions
What is the coil voltage for 3RT1935-5AH01?
48 V AC at 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage. That means it picks up reliably between about 38.4 V and 52.8 V.
What does 3RT1935-5AH01 fit?
It's a magnet coil for Siemens SIRIUS Size S2 contactors. If you have a SIRIUS S2 contactor with a failed coil, this is the direct replacement — same screw terminal pattern, same mounting.
How do I get pricing and availability for 3RT1935-5AH01?
Submit an RFQ. We source this phased-out coil to order through independent distribution; current price and stock are confirmed at quote time.
MPN
3RT1935-5AH01