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Siemens 3RT5944-5AG21 — Contactors

Siemens 3RT5944-5AG21 SIRIUS Magnet Coil, 110 V AC

MPN3RT5944-5AG21

Siemens SIRIUS magnet coil, 3RT5944-5AG21, 110 V AC at 50/60 Hz, screw connection, for contactors.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT5944-5AG21 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz110 V
3RT5944-5AG21 — Other specifications
ParameterValue
At 60 Hz rated value110 V

Product details

SIRIUS magnet coil, 110 V AC — what it fits

It uses a screw connection and is designed for the SIRIUS contactor range. The operating voltage tolerance spans 0.8 to 1.1 times the rated value at 50 Hz, meaning the coil reliably picks up and holds between about 88 V and 121 V — a standard margin for AC control circuits in industrial panels.

Integration note — screw terminal wiring

The screw connection on this coil accepts solid or stranded conductors typical for control wiring. It mounts on the contactor's coil terminals — no DIN-rail space consumed beyond the contactor itself. Verify the free-wheel diode polarity on the contactor's surge suppressor if one is fitted; the coil's AC rating means the suppression circuit must handle the inductive kickback at line voltage.

Frequently asked questions

Where can I buy 3RT5944-5AG21 and get a price?

This coil is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at that time.

What is the rated voltage of 3RT5944-5AG21?

The coil is rated 110 V AC at both 50 Hz and 60 Hz, with an operating voltage tolerance of 0.8 to 1.1 times the rated value at 50 Hz.

Will 3RT5944-5AG21 drop into a panel specified around 3RT1016-2GG22?

The 3RT5944-5AG21 is a magnet coil, not a contactor — it replaces the coil on a SIRIUS contactor, not the entire device. The 3RT1016-2GG22 is a power contactor with a different coil voltage (110 V AC) and screw terminals. If the existing panel uses a SIRIUS contactor that accepts this coil voltage and screw connection, the coil may be a direct replacement, but verify the contactor frame size and coil mounting before ordering.

MPN
3RT5944-5AG21