SIEMENS 3RU5 Thermal Overload Relay, 3RU5156-3LB2 135-160A
LEHIY item code: LH-3071
-Automatic Reset min Depends on Tripping Current Magnitude and Characteristics -Manual Reset min Depends on Tripping Current Magnitude and Characteristics Characteristics Status Display √ Test Function √ Temperature Compensation ℃ 70 80 Permissible Rated Current -Control Cabinet Internal Temperature 60℃ % 94 100 -Control Cabinet Internal Temperature 70℃ % 82.
87 Adapter Terminals Coil Adapter Terminal Not Required Auxiliary Contact Adapter Terminal Not Required Protection Rating: Complies with IEC 60529 standard IP00 (open), IP20 (with terminal cover) Finger Touch Protection: Complies with IEC 61140 standard Finger Touch Safety (with terminal cover) Shock Resistance: Complies with IEC 60068-2-27 Standard.
g/ms 8/10 Air Humidity ％ 90 100 Altitude m Up to 2000m.
For altitudes above 2000m, please contact Siemens technical support hotline.: -Automatic Reset.
Category: Thermal Overload Relay
Rated Operating Voltage U e: V
Quick buying check
This page helps you check SIEMENS 3RU5 Thermal Overload Relay, 3RU5156-3LB2 135-160A before you ask for a quote.
Confirm the brand, model number, part number, and quantity. Share a clear nameplate photo when the old item has close variants.
LEHIY can check stock, lead time, packing, shipping documents, and safe replacement options for maintenance orders.
Technical Specifications
| 3RU5-Overload Relay | ||||
| Type | 3RU51 56 | 3RU51 66 | 3RU51 76 | |
| Specifications | S6 | S10 | S12 | |
| Width | 106(1))</sup>mm | 145mm | 145mm | |
| General Technical Data | ||||
| Trip Type | Overload and Phase Loss | |||
| Trip Class | CLASS | 10 | ||
| Reset and Recovery | ||||
| Trip Reset Type | Manual and Automatic Reset | |||
| -Automatic Reset | min | Depends on Tripping Current Magnitude and Characteristics | ||
| -Manual Reset | min | Depends on Tripping Current Magnitude and Characteristics | ||
| Characteristics | ||||
| Status Display | √ | |||
| Test Function | √ | |||
| Temperature Compensation | ℃ | 70 | 80 | |
| Permissible Rated Current | ||||
| -Control Cabinet Internal Temperature 60℃ | % | 94 | 100 | |
| -Control Cabinet Internal Temperature 70℃ | % | 82 | 87 | |
| Adapter Terminals | ||||
| Coil Adapter Terminal | Not Required | |||
| Auxiliary Contact Adapter Terminal | Not Required | |||
| Protection Rating: Complies with IEC 60529 standard | IP00 (open), IP20 (with terminal cover) | |||
| Finger Touch Protection: Complies with IEC 61140 standard | Finger Touch Safety (with terminal cover) | |||
| Shock Resistance: Complies with IEC 60068-2-27 Standard | g/ms | 8/10 | ||
| Air Humidity | ％ | 90 | 100 | |
| Altitude | m | Up to 2000m. For altitudes above 2000m, please contact Siemens technical support hotline. | ||
| Installation Method | Independent Installation | |||
| Main Circuit | ||||
| Rated Insulation Voltage U<sub>i</sub> (Pollution Degree 3) | V | 1000 | ||
| Rated Impulse Withstand Voltage U<sub>imp</sub> | kV | 8 | ||
| Rated Operating Voltage U<sub>e</sub> | V | 1000 | ||
| Current Type | ||||
| DC | Available (2)</sup> | Unavailable | ||
| AC | Available, frequency up to 400Hz | |||
| Current Range | A | 55…80 to 170…205 | 140…200 to 220…320 | 280…400 to 350…500 Ω|
| Maximum power consumption per thermal overload relay | W | 24 | 21 | 36 |
| Insulation between main and auxiliary circuits conforms to IEC60947-1 standard | V | 1000 | ||
| 1) Except for 3RU5156-3NB1 2) Requires three-pole series connection | ||||
| Cross-sectional area of main circuit conductor | ||||
| Screw Terminal Block | ||||
| Terminal Screw | M8 (Hexagonal Outer Head)<sup>2)</sup> | M10 (Hexagonal Outer Head) | M10 (Hexagonal Outer Head) | |
| Tightening Torque | Nm | 10…14 | 14…24 | 14…24 |
| Conductor Cross-sectional Area (Maximum...Minimum) | ||||
| 1 or 2 wires | ||||
| Fine multi-strand wire with prefabricated terminals | mm<sup>2</sup> | 2x（16…95） | 2x（35…150） Max.1x240 | 2x（95…150） Max.1x240 |
| AWG wire, solid or multi-strand wire | AWG | 1/0…250kcmil | 2/0…500kcmil | 2/0…500kcmil |
| Ribbon Cable/Busbar | mm | 2x20x3 | 2x25x6 | 2x25x6 |
| Auxiliary Circuit | ||||
| Number of Normally Open Contacts | 1 | |||
| Number of Normally Closed Contacts | 1 | |||
| i</sub> (pollution degree 3) V 690 Rated impulse withstand voltage U<sub>imp</sub> kV 8 9 Breakthrough capacity of auxiliary contacts | Auxiliary contact assignment | |||
| Breakthrough capacity of auxiliary contacts | ||||
| 24V | A | 4 | ||
| 120V | A | 4 | ||
| 125V | A | 4 | ||
| 230V | A | |||
| 400V | A | 2 | ||
| 600V | A | 0.75 | ||
| 690V | A | 0.75 | ||
| NO Normally open contact, AC-14/AC-15, rated operating current Ie under rated operating voltage U<sub>e</sub> | ||||
| 24V | A | 3 | ||
| 120V | A | 3 | ||
| 125V | A | 3 | ||
| 230V | A | 2 | ||
| 400V | A | |||
| 600V | A | 0.75 | ||
| 690V | A | 0.75 | ||
| NC normally closed contact and NO normally open contact, DC-13, rated operating current Ie under rated operating voltage U<sub>e</sub> | ||||
| 24V | A | 1 | ||
| A | 6 | |||
| Contact Reliability | Suitable for solid-state circuits, minimum current handling 5mA (17V) | |||
| Safety isolation between main and auxiliary circuits, compliant with IEC60947-1 standard | V | ≥400 | ||
| Auxiliary circuit conductor cross-sectional area | ||||
| Screw terminal block | ||||
| Terminal screw | M3, No. 2 crosshead screwdriver | |||
| Tightening torque | Nm | 0.8…1.2 | ||
| Conductor cross-sectional area | ||||
| 1 or 2 wires | ||||
| Solid wire | mm<sup>2</sup> | 2x（0.5…1.5）1), 2x（0.75…2.5）1） | ||
| mm<sup>2</sup> | 2x(0.5…1.5)1), 2x(0.75…2.5)1) | |||
| AWG wire, solid or multi-strand wire | AWG | 2x(20…16)1), 2x(18…14)1) | ||
| 1) If two wires with different cross-sectional areas need to be connected to one terminal block, ensure that the cross-sectional areas of both wires are within the required range. | ||||
| 2) For the 3RU5156-3NB1 product, M8 and M10 wiring screws are required |
| 3RU5-Overload Relay | |||
| Type | 3RU51 36 | 3RU51 46 | |
| Specifications | S2 | S3 | |
| Width | 55mm | 70mm | |
| General Technical Data | |||
| Trip Type | Overload and Phase Loss | ||
| Trip Class: Compliant with IEC 60947-4-1 Standard | CLASS | 10 | |
| Reset and Recovery | |||
| Trip Reset Type | Manual and Automatic Reset | ||
| Reset Time | |||
| Reset Time | |||
| -Automatic Reset | min | Depends on Tripping Current Magnitude and Characteristics | |
| -Manual Reset | min | Depends on Tripping Current Magnitude and Characteristics | |
| Characteristics | |||
| Status Display | √ | ||
| Test Function | √ | ||
| IP20 | IP20 (1) | ||
| Finger Touch Protection: Complies with IEC 61140 standard | Finger Touch Safety | ||
| Shock Resistance: Complies with IEC 60068-2-27 standard | g/ms | 8/10 | |
| Air Humidity | % | 100 | |
| Altitude | m | Up to 2000. For altitudes above 2000 m, please contact Siemens technical support. | |
| Installation Method | Plug-in with contactor or use with independent mounting bracket for independent installation. | 3) </sup>||
| 1) Terminal grid protection rating IP00 | |||
| 2) Auxiliary contacts 95/96 and 97/98 shock resistance: 8g/11ms | |||
| 3) Can be used for screw fixing or 35 mm standard DIN rail mounting. | |||
| Main Circuit | |||
| Rated Insulation Voltage U<sub>i</sub> (Pollution Degree 3) | V | 690 | 1000 |
| Rated Impulse Withstand Voltage U<sub>imp</sub> | kV | 6 | 8 |
| Rated Operating Voltage U<sub>e</sub> | V | 690 | 1000 |
| Current Type | |||
| DC | Available | ||
| AC | Available, frequency up to 400 Hz | ||
| Current Range | A | 5.5...8 to 40...50 | 18...25 to 80...100 |
| Maximum Power Consumption per Thermal Overload Relay | W | 6...9 | 10...16.5 |
| Safety insulation between main circuit and auxiliary circuit (compliant with IEC 60947-1 standard) | V | ≥ 440 | |
| Auxiliary circuit | |||
| Number of normally open contacts | 1 | ||
| Number of normally closed contacts | 1 | ||
| Auxiliary contact allocation | 1 NO Provides "trip" signal | ||
| 1 NC for disconnecting the contactor | |||
| Break-off capacity of auxiliary contacts | |||
| ·NC normally closed contact, AC-14/AC-15, rated current Ie under rated operating voltage U<sub>e</sub>: | |||
| -24V | A | 4 | |
| -120V | A | 4 | |
| -125V | A | 4 | |
| -230V | A | 3 | |
| -400V | A | 2 | |
| -600V | A | 0.75 | |
| -690V | A | ||
| ·NO normally open contact, AC-14/AC-15, rated current Ie under rated operating voltage U<sub>e</sub>: | |||
| -24V | A | 3 | |
| -120V | A | 3 | |
| -125V | A | 3 | |
| -230V | A | 2 | |
| -400V | A | 1 | |
| -600V | A | 0.75 | |
| -690V | A | 0.75 | |
| -24V | A | 1 | |
| -60V | A | For details, please consult Siemens technical support hotline | |
| -110V | A | 0.22 | |
| -125V | A | 0.22 | |
| -220V | A | 0.11 | |
| ·Conventional Heating Current Ith | A | 6 | |
| ·Contact Reliability | Suitable for solid-state circuits, minimum on-state current 5 mA (at 17 V). | ||
| Safety isolation between main circuit and auxiliary circuit (compliant with IEC 60947-1 standard) | A | ≥ 440 | |
| Cross-sectional area of auxiliary circuit conductor | |||
| Screw terminal block | |||
| Terminal screw | M3, No. 2 cross-section screwdriver | ||
| Tightening torque | Nm | 0.8 ... 1.2 | |
| Conductor cross-sectional area (maximum...minimum) | |||
| Can connect 1 or 2 wires | |||
| ·Solid wire | mm<sup>2</sup> | 2×(0.5 ... 1.5) <sup>1)</sup> ，2×(0.75 ... 2.5) <sup>1)</sup> | |
| ·Fine multi-strand wire with prefabricated terminal blocks (DIN 46228 T<sup> 1)</sup> | mm<sup>2</sup> | 2×(0.5 ... 1.5) <sup>1)</sup> ，2×(0.75 ... 2.5) <sup>1)</sup> | |
| ·AWG conductor, solid or multi-strand conductor | 2×(20 ... 16) <sup>1)</sup> ，2×(18 ... 14) <sup>1)</sup> | ||
| 1) If two conductors with different cross-sectional areas need to be connected to one terminal block, ensure that the cross-sectional areas of both conductors are within the required range. |
Product Applications
|
Technical Specifications
| Specification | Value |
|---|---|
| Brand | SIEMENS |
| Category | Thermal Overload Relay |
| Series | 3RU |
| Setting Current Range (A) | 135-160 |
| Installation Method | Independent Installation |
| Applicable Contactors | S6 |
Plain language sourcing guide for SIEMENS 3RU5 Thermal Overload Relay, 3RU5156-3LB2 135-160A
Start with the full model name. Check the brand name. Check the part number. Check the code on the old unit. These small checks help you avoid a wrong order.
Take one clear photo of the front label. Take one photo of the side label. If the part has a cable, plug, port, seal, coil, or screen, take a photo of that area too.
Tell us the quantity you need. Tell us your country. Tell us the date when the plant needs the part. We can then check stock, lead time, safe packing, and the best shipping plan.
If the exact model is no longer made, do not guess. Send the old model and the use case. LEHIY can compare close options and explain which choice is safer for repair work.
Use simple order notes. Write the model in one line. Write the quantity in one line. Write the delivery country in one line. This helps our team reply faster.
Check the old part before removal. Look at the label. Look at the connector. Look at the mounting size. Look at the voltage or pressure rating if it is shown.
Do not rely on a short nickname for a part. Many industrial items have close versions. A small suffix can change the plug, output, range, or software setting.
Ask for a stock check if the plant is stopped. Ask for a lead time if the order is planned. Ask for packing photos if the part is fragile or heavy.
For a replacement order, tell us what failed. Tell us where the part is used. Tell us if an equal model is acceptable. This makes the first answer more useful.
For repeat orders, send the last invoice, old label, or old packing photo. The same reference can help us match the correct product again.
For urgent service, keep the message simple. One model, one quantity, one photo, and one delivery target are enough for a fast first check.
Share Article
| Brand Name: | Siemens | Certification: | ISO9001, CE |
|---|---|---|---|
| Place of Origin: | China | Condition: | New |
| Warranty: | 1 year | Customized sourcing: | available |
What are your strengths?
Ans. LEHIY specializes in industrial automation and control components, offering fast sourcing, stable quality, and competitive prices for global customers.
What is your estimated delivery time?
Ans. Most items ship within 3-7 days. Customized or rare models may take 10-30 working days.
What are your primary product offerings?
Ans. Our main products include PLCs, sensors, valves, solenoid valves, actuators, power modules, transmitters, and complete industrial automation solutions.
How can I get in touch with you?
Ans. You can reach us anytime via Email, WhatsApp, LinkedIn, or our contact page. Our sales engineers respond quickly and provide technical support when needed.
What are your payment terms?
Ans. Standard terms are 50% TT in advance and 50% balance before delivery. We also support Alibaba Trade Assurance and L/C for qualified orders.
Feel free to Ask questions
Replacement support
SIEMENS 3RU5 Thermal Overload Relay, 3RU5156-3LB2 135-160A
Send the brand, model, part number, quantity, nameplate photos, and application requirements. LEHIY will check availability, suitable alternatives, packing details, and delivery options before quoting.
For discontinued, temporarily unavailable, or configuration-sensitive items, our team can compare the requested model with close variants or compatible replacements for maintenance and spare parts planning.
Use this page as a practical sourcing note for engineers, buyers, and maintenance teams comparing automation components. Check the model name, brand, LEHIY code, application, and replacement requirements before sending an inquiry.
Short, clear information helps our team confirm availability faster and reduce back-and-forth communication during urgent maintenance projects.
- Confirm the complete model number and any suffix printed on the nameplate.
- Share quantity, destination country, preferred shipping method, and target delivery date.
- Include photos, drawings, old purchase records, or datasheets when compatible alternatives are acceptable.
- Ask for stock checking, replacement comparison, packing details, and export documentation before ordering.
Useful details for a faster quote
- Complete model and part number
- Required quantity and target delivery date
- Nameplate photos, drawings, or old purchase records
- Voltage, signal range, dimensions, or accessory needs
Model matching
We review brand, model, part number, nameplate photos, installation environment, and replacement requirements.
Quality and delivery
Each order can be checked for authenticity, condition, packing, warranty, shipping method, and delivery schedule.
Stock alternatives
For urgent maintenance projects, we can help check stock, compatible alternatives, and fast international shipment.
SIEMENS 3RU5 Thermal Overload Relay, 3RU5156-3LB2 135-160A verification notes
Please send the full model number, quantity, target delivery date, and nameplate photos. These details help us check the requested product or a close replacement.
LEHIY reviews product name, part number, series, label information, and application requirements before shipment.
If the original model is discontinued or supplied with different accessories, we can explain practical differences before quoting.
For repeat purchasing, we can help organize related models, replacement parts, shipment schedules, and clear communication for your team.
Related Products
Helpful links
Explore More
Product family
More In This Category
Trusted partners
We have collaborated with many well-known enterprises, contributing to their success and establishing a strong reputation as a trusted partner in the industry.
