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3RT1024-1AG20
Siemens 3RT1024-1AG20 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
The Siemens 3RT1024-1AG20 is a SIRIUS size S0 power contactor designed for reliable switching of three-phase loads in industrial control panels and motor control applications. It features three normally-open main contacts (3NO) with a 40 A rating in AC-1 duty and is suited to controlling motors up to 5.5 kW at 400 V in AC-3 duty, with an operating power rating of 23 kW at 400 V in AC-1. The unit is fitted with a 110 V AC, 50/60 Hz coil and uses screw-type terminals for both the main circuit and the control connections, supporting straightforward panel wiring. With an IP20 front protection rating and compact 45 mm width, it is well suited to space-efficient assemblies and mounting on 35 mm DIN rail or by screw fixing, with side-by-side mounting supported. Designed for consistent performance across typical industrial environments, it operates from -25 °C to +60 °C and offers long mechanical endurance for frequent switching duties.
| Specification | Description |
|---|---|
| Manufacturer | Siemens |
| Manufacturer Part Number | 3RT1024-1AG20 |
| Alternative Part Number Format | 3RT10241AG20 |
| Product Range | SIRIUS |
| Product Type | Power contactor |
| Part Description | Compact Siemens SIRIUS 3‑pole power contactor in size S0 with screw terminals, designed for switching three-phase loads and motors using a 110 V AC control coil (50/60 Hz). |
| Contactor Size | S0 |
| Main Poles | 3 |
| Main Contact Configuration | 3 NO (3 normally open), 0 NC |
| Rated Operational Current (AC-1) | 40 A at 400 V (40 °C ambient) |
| Rated Operational Current (AC-3) | 12 A at 400 V |
| Rated Operational Current (AC-4) | 12.5 A at 400 V |
| Rated Power (AC-3) | 5.5 kW at 400 V |
| Rated Power (AC-3) | 7.5 kW at 500 V |
| Rated Power (690 V) | 7.5 kW (rated value) |
| Operating Power (AC-1) | 23 kW at 400 V |
| Control Supply Voltage | 110 V AC |
| Control Frequency | 50/60 Hz |
| Coil Operating Range (50 Hz) | 0.8 … 1.1 × rated control voltage |
| Coil Operating Range (60 Hz) | 0.85 … 1.1 × rated control voltage |
| Apparent Pick-up Power | 64 VA |
| Apparent Holding Power | 8.4 VA |
| Built-in Auxiliary Contacts | None (0 NO, 0 NC) |
| Front Protection Rating | IP20 |
| Terminal Protection Rating | IP20 |
| Pollution Degree | 3 |
| Ambient Temperature (Operation) | -25 … +60 °C |
| Maximum Installation Altitude | 2,000 m above sea level |
| Mechanical Service Life | Typical 10,000,000 switching cycles |
| Mounting Method | Screw mounting and snap-on mounting on 35 mm DIN rail (DIN EN 50022) |
| Side-by-side Mounting | Yes |
| Dimensions (H × W × D) | 85 mm × 45 mm × 91 mm |
| Minimum Side Clearance to Earthed Parts | 6 mm |
| Main Circuit Connection Type | Screw-type terminals |
| Control Circuit Connection Type | Screw-type terminals |
| Main Terminal Conductor Size (Solid) | 2× (1…2.5 mm²), 2× (2.5…6 mm²), max. 2× 10 mm² |
| Main Terminal Conductor Size (Stranded) | 2× (1…2.5 mm²), 2× (2.5…6 mm²), max. 2× 10 mm² |
| Main Terminal Conductor Size (Fine-stranded with ferrule) | 2× (1…2.5 mm²), 2× (2.5…6 mm²) |
| Main Terminal Conductor Size (AWG) | 2× (16…12), 2× (14…10), 1× 8 |
| Auxiliary/Control Terminal Conductor Size (Solid) | 2× (0.5…1.5 mm²), 2× (0.75…2.5 mm²), max. 2× (0.75…4 mm²) |
| Auxiliary/Control Terminal Conductor Size (Fine-stranded with ferrule) | 2× (0.5…1.5 mm²), 2× (0.75…2.5 mm²) |
| Auxiliary/Control Terminal Conductor Size (AWG) | 2× (20…16), 2× (18…14), 1× 12 |
| Recommended Short-circuit Protection (Main, Coordination Type 1) | gL/gG fuse 63 A |
| Recommended Short-circuit Protection (Main, Coordination Type 2) | gL/gG fuse 25 A |
| Recommended Short-circuit Protection (Auxiliary) | gL/gG fuse 10 A |
What is this device used for?
It is a three-pole power contactor designed to switch and control three-phase loads such as motors and resistive loads using an electrically operated coil.
What contact configuration does it have?
It has 3 normally open (3NO) main power contacts and no normally closed main contacts.
What control voltage does the coil require?
The coil is rated for 110 V AC at 50/60 Hz, with an operating range factor of 0.8 to 1.1 of the rated control supply (frequency-dependent tolerance).
What are the typical current ratings for AC applications?
Typical ratings include 40 A at AC-1 (400 V, 40 °C ambient) and 12 A at AC-3 (400 V) for motor switching duty.
What motor power can it switch?
For motor duty (AC-3), it is rated around 5.5 kW at 400 V. For resistive loads (AC-1), it is rated up to 23 kW at 400 V.
Can it be used on supply voltages up to 690 V?
Yes. The main circuit AC-1 rating is specified up to 690 V (current rating varies with ambient temperature).
Does it include built-in auxiliary contacts?
No. The base unit does not include instantaneous auxiliary contacts (0 NO / 0 NC). Auxiliary blocks can be added if additional signalling contacts are required.
What is the ingress protection rating?
The front is rated IP20. The terminal area is also specified as IP20 (and may be referenced as IP00 depending on installation conditions), so the device should be installed in an appropriate enclosure.
What are the mounting options?
It supports screw mounting and snap-on mounting onto a 35 mm standard DIN rail (DIN EN 50022). Side-by-side mounting is permitted.
What are the overall dimensions?
Approximate dimensions are 85 mm high, 45 mm wide, and 91 mm deep (size S0).
What conductor sizes can be connected to the main terminals?
The screw terminals accept a range of conductor cross-sections, including up to 2 x 10 mm² for the main contacts (depending on conductor type and installation practice).
What short-circuit protection is typically specified?
Typical gL/gG fuse guidance includes 63 A for type of coordination 1 and 25 A for type of coordination 2 on the main circuit, plus 10 A for the auxiliary switch circuit when fitted.
What are the ambient operating conditions?
It is specified for operation from -25 °C to +60 °C, with a maximum installation altitude of 2,000 m above sea level.
What is the typical mechanical service life?
The typical mechanical service life is around 10,000,000 switching cycles for the contactor (values can vary if additional auxiliary modules are fitted).
Can it be used for DC switching as well as AC?
DC utilisation categories are specified for certain configurations. For example, at DC-1 with one current path the rated current at 110 V DC is 4.5 A; higher DC ratings may be possible when using multiple current paths in series, depending on the duty category and wiring arrangement.
How much power does the coil draw?
The coil has an apparent pick-up power of about 64 VA and an apparent holding power of about 8.4 VA for AC operation (110 V AC coil).
- Switching and controlling three-phase induction motors in industrial control panels where a 110 V AC control supply is used
- Serving as the main power switching element in motor starter assemblies for pumps, fans, and blowers up to typical AC-3 duty levels
- Controlling conveyor and materials-handling drives in manufacturing and warehouse automation systems
- Integrating into machine tool electrical cabinets for reliable start/stop control of spindle and auxiliary motors
- Acting as a contactor stage in HVAC and building services plant rooms for motor-driven equipment control
- Providing remote switching of three-phase loads in automation systems using PLC or relay-based control circuits
- Use in control circuits requiring compact S0 footprint with screw terminals for straightforward panel wiring
- Switching resistive and lightly inductive three-phase loads (AC-1 duty) such as heaters and general-purpose power circuits
- Enabling interlocked forward/reverse motor control configurations when used as part of paired contactor arrangements
- Use in modular panel builds where side-by-side mounting on a 35 mm DIN rail is preferred
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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