Siemens 3RT1033-1AK60 Contactor
The Siemens 3RT1033-1AK60 is a SIRIUS size S2 power contactor rated for heavy-duty motor switching at 11kW, 400V. Built for AC-4 duty with a 110V/50Hz, 120V/60Hz AC control coil, it handles jogging, plugging, and reversing applications where standard contactors fall short.
Description
- AC-4 Heavy Duty: Handles jogging, plugging, and reversing motor applications.
- Heavy-Duty S2 Frame: Built for higher load capacity than S0 contactors.
- Wide Conductor Range: Accepts stranded conductors up to 25mm² (AWG 2).
- High Shock Resistance: Withstands 15g sine pulse at 5ms duration.
- Fast Switching Response: Provides 11–30ms closing and 7–20ms opening.
Documentation
Technical Specifications
| Manufacturer | Siemens |
|---|---|
| Part Number | 3RT1033-1AK60 |
| Type | Contactor |
| Series | 3RT10, SIRIUS |
| Contactor Size | S2 |
| Operating Power | 11kW at 400V AC-3 7kW at 400V AC-4 |
| Supply Voltage | 110V AC at 50Hz 120V AC at 60Hz |
| Enclosure Rating | IP20 (front), IP00 (terminal) |
| Connection Type | Screw Terminals |
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Description
The Siemens 3RT1033-1AK60 is a size S2 SIRIUS power contactor built for switching three-phase motor loads up to 11kW at 400V. Unlike standard AC-3 contactors, it is rated for AC-4 duty — making it the right choice for motor circuits that involve frequent jogging, plugging, or reversing where the contactor must break full motor current mid-rotation. Common in cranes, hoists, machine tools, and conveyor systems.
Sized at S2 with a 110V/50Hz, 120V/60Hz AC control coil, the 3RT1033-1AK60 mounts on 35mm DIN rail or via screws and supports side-by-side installation. Its screw terminals accept conductors up to 25mm², accommodating the heavier wiring typical of high-cycle motor circuits. Front-mounted auxiliary switch blocks can be added for control feedback. Note: this is a phased-out product. Siemens recommends the SIRIUS 3RT2026-1AK60 as the direct successor.
Frequently Asked Questions
What makes the 3RT1033-1AK60 different from smaller S0 contactors?
The S2 frame is rated for AC-4 heavy-duty switching (jogging, plugging, reversing) and accepts larger conductors up to 25mm², where S0 contactors are limited to 10mm².
What kind of motor applications is this contactor designed for?
It is suited for AC-4 duty — cranes, hoists, machine tools, and conveyors where motors are frequently jogged, plug-stopped, or reversed under load.
Can auxiliary contacts be added to this contactor?
Yes. Front-mounted auxiliary switch blocks can be added for control feedback and interlocking, with contact reliability rated at 1 faulty switching per 100 million.
