• TECO RHU-10/4K1 Thermal Overload Relay, 2.9-4A Amp Range, High-Performance Overload Protection for Industrial and Residential Use - TECO
  • TECO RHU-10/4K1 Thermal Overload Relay, 2.9-4A Amp Range, High-Performance Overload Protection for Industrial and Residential Use - TECO
  • TECO RHU-10/4K1 Thermal Overload Relay, 2.9-4A Amp Range, High-Performance Overload Protection for Industrial and Residential Use - TECO
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TECO

TECO RHU-10/4K1 Thermal Overload Relay, 2.9-4A Amp Range, High-Performance Overload Protection for Industrial and Residential Use

TECO RHU-10/4K1 Thermal Overload Relay, 2.9-4A Amp Range, High-Performance Overload Protection for Industrial and Residential Use

$61.89 USD
$61.89 USD $61.89 USD
İndirim Tükendi
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Condition new
MPN RHU-10/4K1 2.9 ~ 4A
Model RHU-10/4K1
Voltage 4kV
Capacity 2.9 ~ 4A
Function Thermal Overload Protection
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Description


TECO RHU-10/4K1 Thermal Overload Relay, 2.9-4A Amp Range, High-Performance Overload Protection for Industrial and Residential Use

The TECO RHU-10/4K1 Thermal Overload Relay offers reliable protection with its 2.9-4A amp range and thermal overload protection for industrial and residential use.

The TECO RHU-10/4K1 Thermal Overload Relay is designed for reliable protection against overcurrent in both industrial and residential applications. With an amp range of 2.9 to 4A, this relay provides robust overload protection against thermal overloads, ensuring safe operation under varying load conditions. Its high-performance design ensures quick response and accurate operation, making it an ideal choice for protecting electrical systems from damage caused by overcurrent. Perfect for use in motor control centers, industrial machinery, and home electronics, the TECO RHU-10/4K1 Thermal Overload Relay is a trusted solution for maintaining system reliability.

Engineer's Quick Brief

  • Precision Motor Protection: Specially engineered for 3-phase AC motors with full-load currents matching the adjustable 2.9A to 4.0A bi-metallic thermal strip range.
  • Phase-Failure Sensitivity: Features a differential mechanism providing advanced protection against single-phasing and phase unbalance, preventing localized winding burnout.
  • Flexible Reset Modes: Equipped with a manual/automatic reset selector and isolated 1NO + 1NC auxiliary contacts for seamless integration into control circuits and fault signaling loops.

TECO RHU-10/4K1 Thermal Overload Relay

The TECO RHU-10/4K1 is an industrial-grade, bi-metallic thermal overload relay designed to provide reliable, inverse-time delay protection for low-voltage AC motors. Operating within an adjustable current setting range of 2.9A to 4.0A, this high-performance protection device mounts directly to compatible TECO mini contactors or installs independently via standalone brackets. Featuring built-in ambient temperature compensation and phase-loss protection mechanisms, the RHU-10/4K1 acts as a critical line of defense in automated pump controls, HVAC air handlers, conveyor drives, and residential machinery lines by interrupting the contactor control coil circuit before damaging overcurrent conditions destroy stator insulation.

Technical Specifications

Engineering Parameter Specification Value
Brand / Manufacturer TECO Electric & Machinery Co., Ltd.
Model Series RHU-10 / 4K1
Relay Type Bi-metallic Thermal Overload Relay
Current Adjustment Range 2.9 A to 4.0 A
Rated Insulation Voltage (Ui) 690 V AC
Rated Impulse Withstand Voltage (Uimp) 6 kV
Overload Trip Class Class 10A (Trips within 2-10s at 7.2 times setting current)
Auxiliary Contact Configuration 1 NO (Normally Open) + 1 NC (Normally Closed)
Ambient Temperature Compensation -10°C to +40°C (No Derating)
Reset and Test Functions Manual/Auto Reset Selector, Test Button, Trip Indicator Bar

Application Matrix & Industrial Use Cases

Deployment Target Engineering Integration Function System Level Benefit
Small Industrial Pumps & Fans Monitors running currents of 1.1kW to 1.5kW 3-phase motors against impeller blockages. Prevents winding degradation caused by continuous running stall conditions.
Packaging Conveyor Lines Interrupts the main contactor coil when mechanical jamming causes an unexpected amperage spike. Protects transmission gears and motor assemblies from mechanical overload distortion.
Residential HVAC Air Handlers Acts as thermal memory protective hardware inside regional sub-panels under erratic power grid drops. Mitigates phase unbalance threats common in remote or residential branch lines.

Quick Insights: Thermal Overload Setting & Trip Calculator

For control panel builders and site maintenance electricians: Input your motor's nameplate data to verify the recommended dial calibration setting and estimate the cold-start trip time curve for the TECO RHU-10/4K1.

Commissioning & Electrical Troubleshooting FAQ

Q1: What is the mechanical difference between selecting Manual (H) vs Automatic (A) reset mode?

A1: In Manual Reset mode (factory default, blue pin depressed), once a trip occurs, an technician must physically inspect the hardware and press the reset plunger after the bimetal strips have cooled. In Automatic Reset mode (pin turned counter-clockwise), the internal mechanical latch resets autonomously as the strip returns to its flat state. Warning: Do not use Automatic mode in automated restarting architectures if a sudden restart poses mechanical hazards to staff.

Q2: The relay trips during high inertia start cycles even though the running current is below 4A. How do I solve this?

A2: TECO RHU-10/4K1 conforms to Class 10A tripping specifications. If the machinery exhibits a long acceleration curve (e.g., heavy fan blades or high-viscosity mixers) exceeding 10 seconds under locked-rotor current levels, the bi-metal strip accumulates critical thermal deflection before dropping to steady-state operational speed. Consider utilizing a bypass starting circuit or moving to a Class 20/30 heavy-duty overload protection layout.

Q3: How do I test the internal auxiliary contact integrity without generating an actual thermal overload fault?

A3: Pull or slide the integrated test indicator pin sharply outward using an isolated alignment tool. This mechanical displacement mimics a thermal trip condition, causing the NC contacts (95-96) to split open and the NO contacts (97-98) to snap closed. The orange flag indicator should display in the visual status window. Pressing the blue reset button restores the original circuit paths.

Cross-Reference Guide

The TECO RHU-10/4K1 aligns with precision modular motor branch architectures. When adjusting sourcing logistics or performing emergency field replacements, consider the following industry standard cross-reference matches matching the 2.9A - 4.0A threshold criteria:

Equivalent Configurations Interchange Compatibility Status Critical Mechanical & Wiring Verifications
Schneider Electric LRD08 (2.5A - 4.0A) Functional and Range Equivalence Requires independent din-rail mounting base adapter if used away from native contactor configurations.
Fuji Electric TR-0N/3 (2.8A - 4.2A) Functional Alternative Target Confirm auxiliary contact terminal location layout adjustments before reconnecting control loom wiring.

About Koeed Automation

Expert Supply Solutions for Global Industrial Electronics

At Koeed.com, we are professional architects of the industrial electronics supply chain. We specialize in providing high-performance PLCs, HMIs, Servo Motors, Drives, and Converters to ensure that modern manufacturing operations remain efficient, reliable, and future-proof in 2026’s competitive landscape.

🛡️ Certified Quality

We source only 100% authentic industrial hardware from global category leaders. Every component undergoes a rigorous verification process to meet Industry 4.0 reliability standards.

⚙️ Engineering Domain

Our experts provide more than just parts; we offer technical insight. We assist in complex product selection and compatibility audits for both legacy system upgrades and new installations.

🌐 Rapid Global Logistics

Time is money in industrial automation. Our optimized supply network ensures that critical components reach your facility quickly, significantly reducing unplanned downtime and operational loss.

Strategic Global Portfolio: Siemens, Omron, FANUC, Schneider Electric, Mitsubishi, Yaskawa, Allen-Bradley, and other elite industrial brands.

Supporting your vision for a smarter, more efficient industrial future.

Alternative Names


  • TECO RHU-10/4K1
  • TECO RHU 10/4K1
  • TECO 10/4K1 Thermal Relay
  • TECO 4K1 Thermal Relay

Special Reminder

Important

If you have any questions about product information and prices, please feel free to contact us by email or WhatsApp. We will respond quickly.

  • Business Days Only (Monday through Saturday)
  • It takes up to 10 days from the time of ordering (excluding Saturdays and Sundays) to the time of delivery to your designated location. Worldwide delivery.
  • Within 3 days after placing the order, we will send you photos and videos of the product via email or WhatsApp for confirmation

International shipping - items may be subject to customs processing depending on the item's customs value.
Sellers declare the item's customs value and must comply with customs declaration laws.
As the buyer, you should be aware of possible:

  • Delays from customs inspection.
  • Import duties and taxes which buyers must pay.
  • Brokerage fees payable at the point of delivery.

Shipping Policy

Global Delivery

We ship to customers all over the world. Our primary logistics providers are DHL, UPS, TNT, FedEx, and EMS.

Processing Time

All orders are processed within 72 hours of purchase. Please note that this applies to business days only.

Shipping Rates & Delivery Estimates

Shipping charges for your order will be calculated and displayed at checkout. Delivery estimates are within 7-14 days. Please note that these shipping times are only estimates and unfortunately, cannot be guaranteed.

Shipment Confirmation & Order Tracking

You will receive a Shipment Confirmation email once your order has shipped containing your tracking number(s). The tracking number will be active within 24 hours.

Customs, Duties, and Taxes

Please note, international shipping services do vary from country to country. To find out the exact services that are available, please put in your full address at checkout. Shipping internationally does mean that you may be required to pay customs and import taxes. All international customers are responsible for the customs rates within their own country. For further information, we recommend contacting your local customs office.

Damages

We take every reasonable precaution to ensure that products are not damaged. If the item is damaged in transit, please immediately contact us. We are not liable for any products damaged or lost during shipping. If you received your order damaged, please contact the shipment carrier to file a claim. Please save all packaging materials and damaged goods before filing a claim.

Force Majeure

When encountering with force majeure, the processing of orders will be delayed. Nevertheless, it is ensured that your order will be processed in a fast manner when weather permits.

Address Verification

Please verify you have the correct shipping address on your order PRIOR to making payment as this is the address we will ship to.

Return Policy

For more information, visit our Return Policy page.

International shipping - items may be subject to customs processing depending on the item's customs value.

Sellers declare the item's customs value and must comply with customs declaration laws.
As the buyer, you should be aware of possible:
• Delays from customs inspection.
• Import duties and taxes which buyers must pay.
• Brokerage fees payable at the point of delivery.

Contact Us

If you have any questions about your order, please contact us at moritta@koeed.com.

Return Policy

Return and Refund Policy

We want you to be completely satisfied with your purchase on our store. If for any reason you are not entirely satisfied, we're here to help!

Returns

You have a generous 30 calendar days to return an item from the date you received it. To be eligible for a return, ensure the item is in its original, unworn, and unused condition with tags and packaging intact. Retain your receipt or proof of purchase for eligibility. Please note that certain items are non-returnable like perishables, custom products, personal care goods, hazardous materials, flammable liquids, and gases. Reach out for clarifications on specific items.

Return Process

Commence the return process by reaching out to us at moritta@koeed.com. Upon approval, we will furnish you with a return shipping label and detailed instructions for dispatching your package. Unnotified returns will not be accepted.

Damages and Issues

Kindly review your order upon delivery. Notify us promptly if it arrives defective, damaged, or incorrect. We will address the matter swiftly.

Exchanges

Facilitate a swift exchange by returning the original item once approved and making a new purchase.

EU 14-Day Cooling Off Period

EU-bound shipments allow a 14-day cancellation or return period without justification. Conditions mirror standard returns.

Refunds

Upon receiving and inspecting your return, we’ll inform you of the refund status. Approved refunds are automatically processed within 10 business days via the initial payment method. Allow time for financial institutions to finalize the refund. For delays exceeding 15 business days post-approval, contact us at moritta@koeed.com.

Shipping

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Contact Us

If you have any questions on how to return your item to us, feel free to contact us at moritta@koeed.com.

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