Siemens 3RT29445AT61 Magnet Coil
Product overview
The 3RT29445AT61 is a Siemens SIRIUS magnet coil configured for 600 V AC, 60 Hz operation, intended as a replacement or spare coil for the 3RT2.4 contactor family. It ships as a box-encapsulated unit bearing ROHS3 compliance and an Active product status.
SIRIUS 3RT2 coil specifications
Electrical and physical attributes
| Parameter | Value |
|---|---|
| Accessory Type | Magnet Coil |
| Base Product Number | 3RT2944 |
| Series | SIRIUS |
| For Use With / Related Products | Contactors (3RT2.4 family) |
| Encapsulation | Box |
| Package | Box |
| Voltage Rating | 600 VAC |
| Frequency | 60 Hz |
| ROHS | ROHS3 Compliant |
| Product Status | Active |
Role in a contactor assembly
The magnet coil is the electromagnetic energizing element that drives the contactor's movable contacts. When the coil is energized at its rated voltage and frequency, it magnetizes the core and closes the main and auxiliary contacts; de-energization allows spring return. This makes the coil a device-level replacement part rather than a field-installable option in most panel configurations.
In-catalog comparison (3RT2944 base family)
| MPN | Voltage | Frequency | Similarity |
|---|---|---|---|
| 3RT29445AT61 | 600 VAC | 60 Hz | — |
| 3RT29445AV61 | 480 VAC | 60 Hz | 0.91 |
| 3RT29445AK61 | 110 VAC | 50 Hz / 12 | 0.91 |
| 3RT29445AP61 | 220 VAC | 50 Hz / 240 | 0.91 |
Why they are similar. All four share the same base product number (3RT2944), same accessory type, SIRIUS series, box encapsulation, and ROHS3 designation. The sole differentiating field is voltage/frequency rating, which defines which supply system the coil is matched to. The three alternates are catalog rows in the same coil family — the reader must confirm that the chosen voltage matches the target contactor's control-circuit supply.
Application considerations
- Confirm the contactor's control-circuit voltage before selecting a replacement coil. The 3RT29445AT61 is rated for 600 V AC 60 Hz; mismatched voltage will prevent pull-in or cause coil failure.
- Box encapsulation provides environmental protection for the coil windings; however, the records do not specify an IP rating or temperature class, so installation environment should be evaluated against the contactor's overall rating.
- Replacement coils for SIRIUS 3RT2 contactors are ordered by voltage code; the suffix letter encodes the rating (e.g., T = 600 V AC 60 Hz, V = 480 V AC 60 Hz, K = 110 V AC 50 Hz).
- All cataloged variants carry Active status and ROHS3 compliance.
FAQ
What contactors use the 3RT29445AT61? The coil is cataloged for use with Siemens SIRIUS 3RT2.4 contactors. Verify that the contactor's coil compartment accepts the 3RT2944 base number.
Can the 3RT29445AT61 replace a 3RT29445AV61 coil? Both are in the same family and share all non-voltage parameters, but they are rated for different supply voltages (600 VAC vs. 480 VAC). Cross-voltage substitution is not confirmed by the catalog record.
What is the difference between the T and P voltage variants? The T-suffix (3RT29445AT61) specifies 600 V AC 60 Hz; the P-suffix variants (e.g., 3RT29445AP61) specify 220 V AC 50 Hz or dual-frequency configurations. Select the variant matching the control-circuit supply.