What are the key advantages of KRIPAL AC Contactors?

KRIPAL AC Contactors are engineered for superior performance and longevity: High Electrical Durability: Withstands frequent switching operations Robust Construction: Ensures reliable performance in demanding environments Low Power Consumption: Energy-efficient coil design reduces operating costs Compact Size: Saves valuable space in control panels Excellent Contact Material: Provides stable conductivity and arc resistance

How do I choose the right AC Contactor for my application?

Selecting the proper contactor involves considering several factors: Rated Current: Match to your load's full-load current with appropriate safety margin Coil Voltage: Ensure compatibility with your control circuit voltage Number of Poles: Choose 3-pole for three-phase motors, 4-pole for specific applications Utilization Category: Select based on load type (e.g., AC-3 for squirrel cage motors, AC-1 for resistive loads) Environmental Conditions: Consider temperature, humidity, and installation location

What is the difference between an AC Contactor and a Relay?

While both are electromagnetically operated switches, they differ in capacity and application: AC Contactors: Designed for higher current loads (typically >15A), featuring arc suppression and robust construction for power circuit control. Relays: Generally used for lower current control circuits, signal transmission, and auxiliary functions.

What maintenance do AC Contactors require?

KRIPAL contactors require minimal maintenance, but we recommend: Regular Inspection: Check for contact erosion, mechanical wear, and dust accumulation Periodic Testing: Verify proper operation and contact resistance Cleaning: Keep the unit free from dust and contaminants Coil Check: Ensure coil voltage remains within specified limits

What safety features are incorporated in KRIPAL AC Contactors?

Our contactors include multiple safety enhancements: Arc Suppression Chambers: Effectively extinguish electrical arcs Insulation Barriers: Prevent accidental contact with live parts Mechanical Interlocks: Available for applications requiring safety interlocks Overload Compatibility: Designed to work seamlessly with thermal overload relays

Can AC Contactors be used for motor starting applications?

Yes, KRIPAL AC Contactors are specifically designed for motor control: Motor Starting: Provide reliable main circuit control for three-phase motors Frequent Operation: Support high electrical and mechanical durability for regular cycling Overload Protection: Compatible with overload relays for complete motor protection Reversing Applications: Available in reversing contactor configurations

How do I troubleshoot common contactor problems?

Common issues and solutions include: Contactor Doesn't Engage: Check control voltage, coil continuity, and mechanical obstructions Excessive Noise: Verify coil voltage, check for loose parts, and inspect magnetic surfaces Overheating: Ensure proper current rating, check connections, and verify ambient temperature Contact Welding: Investigate for short circuits, excessive inrush current, or incorrect utilization category

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Home > Contactors and Relays > AC Contactor

High-Performance AC Contactors for Motor Control, HVAC & Industrial Switching

Name: AC Contactor
Brand: KRIPAL
SKU: AC-Contactor-Series
Availability: InStock

KRIPAL manufactures AC magnetic contactors from 9A to 800A for motor control, HVAC, lighting and general power switching. Our UKC1 (UL Listed), UKC2 and UKC5 series ship factory direct to distributors, panel builders and OEM customers worldwide.

Available in 3 pole and 4 pole with coil voltages of 24V, 110V, 220V and 380V AC. Products comply with IEC 60947-4-1 and hold CE, CB, CCC, UL and RoHS certifications under ISO 9001 production.

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High-Performance AC Contactors for Motor Control, HVAC & Industrial Switching

UKC1 Contactor 4-Pole 24V 110V 220V 380V AC Coil 220A CE Certified

The KRIPAL UKC1 AC contactor is EMC tested and UL listed, ensuring reliability and compliance for your electrical systems.

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UKC1 Contactor 3-Pole 24V 110V 220V 380V AC Coil 32A 40A UL listed

The KRIPAL UKC1 AC contactor is EMC tested and UL listed, ensuring reliability and compliance for your electrical systems.

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UKC1 Contactor 4-Pole 24V 110V 220V 380V AC Coil 32A 40A UL listed

The KRIPAL UKC1 AC contactor is EMC tested and UL listed, ensuring reliability and compliance for your electrical systems.

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UKC1 Contactor 3-Pole 24V 110V 220V 380V AC Coil 50/65/75/85A UL listed

The KRIPAL UKC1 AC contactor is EMC tested and UL listed, ensuring reliability and compliance for your electrical systems.

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UKC1 Contactor 4-Pole 24V 110V 220V 380V AC Coil 9/12/18/22A UL listed

The KRIPAL UKC1 AC contactor is EMC tested and UL listed, ensuring reliability and compliance for your electrical systems.

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UKC1 Contactor 4-Pole 24V 110V 220V 380V AC Coil 50/65/75/85A UL listed

The KRIPAL UKC1 AC contactor is EMC tested and UL listed, ensuring reliability and compliance for your electrical systems.

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UKC1 Contactor 3-Pole 24V 110V 220V 380V AC Coil 9/12/18/22A UL listed

The KRIPAL UKC1 AC contactor is EMC tested and UL listed, ensuring reliability and compliance for your electrical systems.

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AC Contactor Selection Guide for Industrial Power Circuits

An AC contactor is an electromechanical switching device used to switch power circuits in motor control, heating, and lighting applications. KRIPAL manufactures the full UKC series in-house, delivering reliable switching performance for industrial control panels and OEM machinery.

Technical Specifications of the UKC Series

Rated Current: 9A to 800A

UKC1, UKC2, and UKC5 series cover industrial switching applications from panel control to heavy-duty motor and power switching.

Utilization Categories: AC-1, AC-3, AC-4

Classified under IEC 60947-4-1, suitable for resistive loads (AC-1), squirrel-cage motor switching including starting and normal operation (AC-3), and high-frequency inching and plugging applications (AC-4).

Silver Alloy Contacts

Contacts are made of silver alloy materials. An integrated arc chute system extinguishes electrical arcs, extending service life under repeated switching operations.

Global Certifications

Certified to UL, CE, CB, CCC, and RoHS standards, ensuring compliance with international safety and environmental requirements.

Modular System Coordination

UKC system is compatible with UKH overload relays, AU auxiliary contacts, and UKC1-R reversing kits for motor control applications.

4 Systematic Steps to Size Your AC Contactor

Motor Full Load Current (FLA): Ensure the rated operational current (Ie) is equal to or higher than the motor nameplate FLA.
Utilization Category: Select AC-3 for squirrel-cage induction motors and AC-1 for resistive heating loads.
Control Voltage: Match the coil voltage with the control supply (24V, 110V, 220V, or 380V AC).
Pole Configuration: Use 3P for three-phase motors and 4P when neutral switching is required.

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Powering Motor Control Panels and Industrial Distribution

KRIPAL UKC AC contactors are used as the main switching devices in industrial control panels, covering motor and auxiliary loads from 9A machine tool circuits to 800A power distribution systems in manufacturing plants.

Motor Control Drawers in Automotive Assembly

UKC contactors are used in MCC buckets for automotive welding and powertrain lines. Paired with UKH overload relays, they ensure coordinated motor protection in continuous 24/7 operation.

Water Treatment and Irrigation Pump Stations

AC-3 utilization category contactors are used for switching induction motor-driven centrifugal pumps in water treatment, sewage lift stations, and irrigation systems, supporting high-frequency start-stop operation with soft-starter or VFD control.

Industrial Electric Heating and Drying Systems

AC-1 rated UKC contactors manage resistive heating elements in textile, plastic, and commercial bakery applications, providing stable operation where steady-state current handling is required.

HVAC and Refrigeration Compressor Control

Definite-purpose UKC contactors rated for AC-8a and AC-8b duty are specified for hermetic refrigeration compressor motor control in commercial HVAC, cold storage, and chiller applications where frequent cycling and locked-rotor withstand are required.

Material Handling and Conveyor Motor Starters

UKC contactors paired with UKH overload relays form motor starter combinations for conveyor belts, bucket elevators, and packaging lines in warehouses, distribution centers, and manufacturing plants where sequential motor starting and stopping is required.

Build Your Panel with Factory Direct Contactors

Complete Product Range from One Source: Supply contactors from 9A to 800A with matched overload relays, auxiliary blocks, and accessories as coordinated kits from a single manufacturer.
Vertical Integration Equals Supply Chain Control: In-house silver alloy contact production, coil winding, and final testing eliminate dependency on third-party component suppliers.
Global Compliance Ready: IEC/EN 60947 certified with CB scheme test reports, CE and UKCA marking, supporting panel builders serving markets in Europe, Middle East, Southeast Asia, and South America.

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Powering Motor Control Panels and Industrial Distribution

KRIPAL AC Contactor Production: From Foundry to Freight

KRIPAL manufactures AC contactors from 9A to 800A in a vertically integrated facility in Zhejiang, where silver alloy contact assembly, coil winding, and final electrical testing are conducted in-house, ensuring batch-to-batch consistency across the full product range for global panel builders and industrial distributors.

Silver Alloy Contact Production In-House

KRIPAL controls the contact material composition rather than purchasing commodity contacts. This allows fine-tuning of silver-cadmium-oxide and silver-tin-oxide ratios for different current ratings and switching duty categories.

Co-Located Contactor and Overload Manufacturing

UKC contactors and UKH overload relays are manufactured within the same facility, ensuring coordinated mechanical design and matched trip characteristics for integrated motor protection systems.

Full Electrical Endurance Testing Per Batch

Sample units from each production lot are tested for making and breaking capacity using in-house inductive and resistive load banks. All test records are fully traceable to individual production lot numbers.

Mixed-Pallet Export Consolidation

KRIPAL supports consolidated shipment of contactors, overload relays, circuit breakers, and disconnect switches within a single export order, improving logistics efficiency for OEM and panel builder procurement.

Distributor Stock Holding Programs

KRIPAL supports distributor inventory programs with agreed stock levels for standard contactor models. Shipments are planned based on demand data, with scheduled replenishment to maintain stable supply and consistent fill rates.

Private Label with Full Customization

Laser-marked part numbers aligned with your catalog, OEM-branded packaging, and customized multilingual instruction sheets are available. Unbranded supply is provided upon request for private label production.

Multi-Region Certification Package

CE, UKCA, and IEC 60947-4-1 compliance documentation is provided according to target export markets. Technical documentation files are maintained and updated in line with evolving regulatory requirements, supporting machinery directive conformity assessments.

Direct Access to Production Engineers

Your technical team communicates with the engineers who designed and tested your contactors, not a distributor’s sales engineer reading from a catalog. Application questions receive answers within 24 hours during China business hours.

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Frequently Asked Questions

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What does an AC contactor do?

An AC contactor is a switch that controls power to HVAC components like the compressor and fan motor. KRIPAL contactors ensure stable switching under HVAC load conditions.

How do I tell if my AC contactor is bad?

Common signs include buzzing noise, burnt smell, or HVAC system not starting. In most cases, contact wear or coil failure is the cause.

How do I reset an AC contactor?

AC contactors do not have a reset function. If faulty, the unit must be inspected and usually replaced after checking coil voltage and contact condition.

What happens if a contactor fails?

A failed contactor cuts power to HVAC components, causing system shutdown or unstable operation. It may also lead to overheating or contact damage.

What is an AC contactor and how does it work?

An AC contactor is an electrically controlled switch rated for power circuits above 15A. When the coil is energized, contacts close to allow current flow. KRIPAL UKC series contactors are built for motor, lighting and heating control in industrial panels.

How do I choose the right AC contactor for my motor?

Match rated current to motor full load amps, select AC-3 for squirrel cage motors, choose correct pole count and coil voltage. KRIPAL engineers can confirm sizing for your application.

Which KRIPAL AC contactor series has UL certification?

The UKC1 series carries UL Listing for North American motor control. UKC2 and UKC5 hold CE certification for European and international markets.

Can KRIPAL AC contactors work with thermal overload relays?

Yes. UKH thermal overload relays plug directly onto UKC1, UKC2 and UKC5 contactors to form a complete motor starter from one manufacturer.

Does KRIPAL export AC contactors worldwide?

Yes. KRIPAL is a professional AC contactor manufacturer and exporter supplying UKC1, UKC2 and UKC5 series globally with factory direct pricing and export documentation.

Recent Blog

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How to Replace an AC Contactor

KRIPAL offers reliable AC contactors for industrial and commercial use. Available in low voltage and waterproof types. Ideal for HVAC, motor starting, and power...

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