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3RF2170-1AA45
Siemens 3RF2170-1AA45 available at EU Automation. Get in touch today for a quick price.
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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.
Siemens 3RF2170-1AA45 is a SIRIUS 3RF21 solid-state relay designed for single-phase industrial switching applications. With a compact 22.5 mm width, screw-type terminals and zero-point switching function, it is suited to controlling AC loads where fast, contactless operation and reduced mechanical wear are required.
This semiconductor relay is rated for 48 to 600 V AC at 50/60 Hz, with a maximum operational current of 70 A and a 4 to 30 V DC control input. It features a 1200 V thyristor blocking voltage, 600 V rated insulation voltage and IP20 front protection. The unit is intended for screw fixing onto suitable cooling surfaces and supports side-by-side mounting in control panels.
Typical applications include switching resistive and heating loads, industrial process equipment, machinery control panels and automation systems requiring reliable solid-state load control. The 3RF2170-1AA45 offers low input control current, rapid switching response and compatibility with Siemens accessories such as terminal covers, load monitoring modules, converters and power regulators.
This semiconductor relay is rated for 48 to 600 V AC at 50/60 Hz, with a maximum operational current of 70 A and a 4 to 30 V DC control input. It features a 1200 V thyristor blocking voltage, 600 V rated insulation voltage and IP20 front protection. The unit is intended for screw fixing onto suitable cooling surfaces and supports side-by-side mounting in control panels.
Typical applications include switching resistive and heating loads, industrial process equipment, machinery control panels and automation systems requiring reliable solid-state load control. The 3RF2170-1AA45 offers low input control current, rapid switching response and compatibility with Siemens accessories such as terminal covers, load monitoring modules, converters and power regulators.
| Specification | Description |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RF2170-1AA45 |
| Alternative Part Number | 3RF21701AA45 |
| Product Range | SIRIUS 3RF2 |
| Product Type | Solid-state relay |
| Relay Design | Single-phase, 1-pole semiconductor relay |
| Switching Function | Zero-point switching |
| Main Circuit Poles | 1 pole |
| Main Contact Configuration | 1 normally open main contact |
| Rated Operational Voltage | 48 to 600 V AC at 50/60 Hz |
| Operational Voltage Range | 40 to 660 V AC at 50/60 Hz |
| Rated Operational Current | 70 A maximum |
| AC-1 Current Rating | 70 A at 400 V |
| AC-51 Current Rating | 50 A |
| UL 508 Current Rating | 50 A |
| Minimum Operational Current | 500 mA |
| Control Supply Voltage | 4 to 30 V DC |
| Maximum Control Supply Voltage | 30 V DC |
| Control Signal On Threshold | 4 V DC |
| Control Signal Off Threshold | 1 V DC |
| Rated Control Current | 15 mA DC |
| Control Current at Minimum Supply Voltage | 13 mA DC |
| Switching Delay | 1 ms plus up to one half-wave |
| Off Delay | 1 ms plus up to one half-wave |
| Blocking Voltage | 1,200 V |
| Surge Current Withstand | 1,200 A |
| Maximum I²t Value | 7,200 A²s |
| Maximum Voltage Rise Rate | 1,000 V/µs |
| Reverse Current | 10 mA |
| Rated Insulation Voltage | 600 V |
| Surge Voltage Resistance | 6 kV for the main circuit |
| Power Loss | 94 W at rated current in hot operating state |
| Typical No-load Power Loss | 0.5 W |
| Protection Rating | IP20 front protection |
| Touch Protection | Finger-safe from the front for vertical contact |
| Mounting Method | Screw fixing |
| Side-by-side Mounting | Suitable for side-by-side installation |
| Fixing Screw Thread | M4 |
| Maximum Fixing Torque | 1.5 N·m |
| Main Circuit Terminals | Screw-type terminals |
| Control Circuit Terminals | Screw-type terminals with removable terminal component |
| Main Contact Conductor Size | Solid or stranded: 1.5 to 6 mm²; finely stranded with ferrule: 1 to 10 mm² |
| Main Contact AWG Size | AWG 14 to 10 |
| Control Contact Conductor Size | 0.5 to 2.5 mm² for single conductors; 0.5 to 1.0 mm² for two conductors |
| Control Contact AWG Size | AWG 20 to 12 |
| Main Contact Tightening Torque | 2 to 2.5 N·m |
| Control Contact Tightening Torque | 0.5 to 0.6 N·m |
| Main Connection Screw Thread | M4 |
| Control Connection Screw Thread | M3 |
| Stripping Length for Main Contacts | 10 mm |
| Stripping Length for Control Contacts | 7 mm |
| Dimensions | 85 mm high x 22.5 mm wide x 48 mm deep |
| Net Weight | 0.071 kg |
| Operating Temperature | -25 to +60 °C |
| Storage Temperature | -55 to +80 °C |
| Maximum Installation Altitude | 1,000 m above sea level |
| Shock Resistance | 15 g / 11 ms according to IEC 60068-2-27 |
| Vibration Resistance | 2 g according to IEC 60068-2-6 |
| EMC Burst Immunity | 2 kV / 5 kHz according to IEC 61000-4-4 |
| EMC Surge Immunity | 2 kV conductor-to-earth and 1 kV conductor-to-conductor according to IEC 61000-4-5 |
| Electrostatic Discharge Immunity | 4 kV contact discharge and 8 kV air discharge according to IEC 61000-4-2 |
| Conducted HF Emissions | Class A for industrial environments according to CISPR 11 |
| Field-bound HF Emissions | Class B for domestic, business and commercial environments according to CISPR 11 |
| Compatible Accessories | Terminal cover 3RF2900-3PA88, power regulator 3RF2990-0HA16, converter 3RF2900-0EA18, load monitoring 3RF2990-0GA16, basic load monitoring 3RF2920-0FA08 |
| Fuse References | Semiconductor fuse options include 3NE1020-2, 3NE8020-1 and 3NC2280; gG fuse options include 3NA6812 and 3NW6212-1; NEOZED fuse option 5SE2335 |
What type of component is this?
It is a Siemens SIRIUS solid-state relay designed for single-phase load switching. It uses semiconductor switching rather than mechanical contacts, making it suitable for frequent switching applications in industrial control panels.
What load voltage range is it designed for?
The main circuit is rated for AC loads from 48 V to 600 V at 50 or 60 Hz. Its operating range relative to the AC voltage is listed as 40 V to 660 V.
What control voltage does it use?
The control input is DC and accepts 4 V to 30 V DC. A signal level of 4 V DC is used for ON detection, while 1 V DC is used for OFF recognition.
What is the rated current capacity?
The device has a maximum operational current of 70 A, with a rated AC-1 current of 70 A at 400 V. For AC-51 applications and UL 508 rating, the value is 50 A.
Is this a zero-crossing relay?
Yes. This unit has a zero-point switching function, meaning it switches the load close to the AC voltage zero crossing. This can help reduce electrical disturbance when switching suitable resistive loads.
What are the physical dimensions?
The relay has a compact 22.5 mm width, with an 85 mm height and 48 mm depth. It is intended for screw fixing and can be mounted side by side.
What terminal type does it use?
The main circuit and the auxiliary/control circuit both use screw-type terminals. The main contacts use M4 connection screws, while the auxiliary and control contacts use M3 screws.
What conductor sizes can be connected?
For the main contacts, solid or stranded conductors from 1.5 mm² to 6 mm² can be used, or finely stranded conductors with end processing from 1 mm² to 10 mm². For auxiliary and control contacts, the listed range is 0.5 mm² to 2.5 mm² for a single conductor.
What operating temperature range is specified?
The specified ambient operating temperature range is -25 °C to +60 °C. The storage temperature range is -55 °C to +80 °C.
What level of ingress protection does the front provide?
The front of the unit is rated IP20 according to IEC 60529. It is also described as finger-safe for vertical contact from the front.
What accessories are associated with this relay?
Associated accessory types include a terminal cover, power regulator, converter, load monitoring module and basic load monitoring module. For 3RF2170-1AA45, referenced accessory article numbers include 3RF2900-3PA88, 3RF2990-0HA16, 3RF2900-0EA18, 3RF2990-0GA16 and 3RF2920-0FA08.
What fuse references are listed for short-circuit protection?
Listed fuse references include 3NE1020-2 for full-range R semiconductor protection in NH design, 3NE8020-1 for back-up R semiconductor protection in NH design, 3NC2280 for cylindrical 22 x 58 mm back-up protection, 3NA6812 for NH gG fuse use, 3NW6212-1 for cylindrical gG fuse use and 5SE2335 for NEOZED fuse use.
- Switching resistive heating loads in industrial ovens, furnaces and drying equipment
- Controlling electric heaters in plastics processing machinery, including extruders and injection moulding systems
- Solid-state switching for temperature control panels and process heating circuits
- Managing single-phase AC loads where silent, wear-free operation is preferred over electromechanical contactors
- Load switching in packaging machinery, food processing equipment and production lines
- Control of infrared heaters, cartridge heaters and heating elements in automated systems
- Integration into control cabinets requiring compact 22.5 mm DIN-style panel space
- Switching high-current AC loads from low-voltage DC control signals
- Use in systems requiring frequent switching cycles without mechanical contact wear
- Industrial automation applications requiring zero-point switching to reduce electrical interference
- Retrofitting or maintaining Siemens SIRIUS 3RF2 solid-state relay installations
- Use with suitable heat sinking for controlled switching of loads up to 70 A
- Panel builds for machinery requiring screw-terminal connections and compact component layout
- Process control applications where PLC or controller outputs need to operate higher-power AC loads
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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Customer reviews
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Daniel
Excellent customer service...
Alex Bailey is my main point of contact at EU Automation...he is extremely friendly, has exceptional customer service skills and always offers great pricing & lead times.
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