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Siemens 3RT1 Series
4130 variants · Siemens
Siemens 3RT1 Power Contactors — Switching Solutions for Motor and Load Control
The Siemens 3RT1 series is a core product line of power contactors within the SIRIUS switching device family, designed for switching motors and other electrical loads up to 250kW in industrial control panels. With over 4,100 variants across different coil voltages, auxiliary contact configurations, and current ratings, the 3RT1 series forms the backbone of motor control in factory automation, process industries, and building services.
Applications and Use Cases
3RT1 contactors are electromagnetic switching devices that remotely control the power supply to motors, heaters, lighting, and other electrical equipment:
- Motor Starting and Control: Direct-on-line (DOL) starting of three-phase induction motors up to 250kW at 400V AC. Combined with overload relays (3RU, 3RB series), they form a complete motor starter.
- Heating and Lighting Control: Switching resistive loads such as industrial heaters, electric furnaces, and large lighting installations.
- Capacitor Switching: Special variants with pre-charge resistors for switching power factor correction capacitor banks.
- Redundancy and Bypass: In VFD installations, contactors provide bypass switching for maintenance and emergency operation.
Technical Specifications at a Glance
| Parameter | Range |
|---|---|
| Rated operational current (AC-3, 400V) | 7A to 500A |
| Motor power rating (AC-3, 400V) | 3kW to 250kW |
| Coil voltage options | 24V DC, 110V AC, 230V AC, 400V AC, and others |
| Auxiliary contacts | 1NO+1NC up to 4NO+4NC |
| Mechanical life | 10 million operations (typical) |
| Electrical life (AC-3) | 1.2 million operations (typical) |
SIRIUS 3RT1 vs 3RT2 — How to Choose
The 3RT1 covers the lower-to-mid range (7A to 38A for base devices, extending to 500A with larger frame sizes), while the 3RT2 is the compact series optimized for 7A to 38A with a narrower footprint.
Sourcing and Technical Selection Guide
The complete order code encodes the key parameters: 3RT1 + current rating + coil voltage + auxiliary contact configuration. For example, 3RT1036-1BB40 = 50A AC-3 rating with 24V DC coil. Standard configurations in distributor stock; custom coil voltages or special auxiliary contact arrangements: 2-6 week lead times.
About the Siemens 3RT1 Series
The Siemens 3RT1 Series series groups 4130 related part numbers, each listed with full specifications, a datasheet where available, and an RFQ option. The listed variants share a common mounting of screw fixing. Variants differ by depth, height and width, so you can match the exact depth your application requires using the selection guide below.
Select a variant by
- Depth
- 153 mm · 170 mm
- Height
- 172 mm · 196 mm
- Width
- 120 mm · 140 mm
Shared specifications
- Mounting
- screw fixing
Variant comparison
| Parameter | 3RT1056-6AF36 | 3RT1056-6AP36 | 3RT1054-6AB36 | 3RT1055-6AF36-3PA0 | 3RT1364-6AR36 | 3RT1054-6AP36 |
|---|---|---|---|---|---|---|
| Depth | 170 mm | 170 mm | 170 mm | 170 mm | 153 mm | 170 mm |
| Height | 172 mm | 172 mm | 172 mm | 172 mm | 196 mm | 172 mm |
| Width | 120 mm | 120 mm | 120 mm | 120 mm | 140 mm | 120 mm |
Request a quote on any Siemens 3RT1 Series part number and we confirm price, availability and lead time per line — including end-of-life and allocation-constrained variants.
