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Magnetic Motor Starters for DOL Three-Phase Motor Control

KRIPAL manufactures magnetic motor starters as factory pre-wired DOL (Direct-On-Line) assemblies combining a UKC contactor, UKH thermal overload relay, push buttons and IP44/IP65 rated metal enclosure in one ready-to-install unit. Available from 9A to 85A for 230V and 400V three-phase motors, with adjustable overload setting ranges covering standard motor full-load currents. The integrated thermal overload relay provides phase-loss sensitivity and ambient temperature compensation for reliable motor protection in pump, fan and compressor applications.

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Magnetic Motor Starters for DOL Three-Phase Motor Control
UKQ-22MB Magnetic Starter 9/12/18/22A DOL Starter 3 Phase IP44
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UKQ-22MB Magnetic Starter 9/12/18/22A DOL Starter 3 Phase IP44

Magnetic starter UKQ‑22MB for 3‑phase motors with 9‑22 A range, direct‑on‑line (DOL) start and IP44 protection.

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UKQ-40MB Magnetic Starter 32/40A DOL Starter 3 Phase IP44
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UKQ-40MB Magnetic Starter 32/40A DOL Starter 3 Phase IP44

Magnetic Starter Switch UKQ‑40MB (32‑40 A) for 3‑phase motors with IP44 protection.

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UKQ-85B Magnetic Starter 50/65/75/85A DOL Starter 3 Phase IP44 with Metal Case
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UKQ-85B Magnetic Starter 50/65/75/85A DOL Starter 3 Phase IP44 with Metal Case

DOL starter UKQ‑85B for 3‑phase motors (50‑85 A) in a rugged metal case.

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Magnetic Starter Selection Guide for Motor Control

A magnetic starter functions as an integrated motor control device, providing direct switching capabilities alongside comprehensive overload protection within a single assembly. The KRIPAL UKQ series reduces panel wiring time and optimizes spatial efficiency for Original Equipment Manufacturer (OEM) machinery and field-level industrial installations.

Technical Specifications of the UKQ Magnetic Starter Series

Pre-Wired DOL Assembly(Ready-to-Install)

Integrates a high-performance AC contactor and thermal overload relay into one unified unit. This design eliminates complex secondary wiring, enabling rapid Direct-On-Line (DOL) motor starting and significantly reducing installation time.

Current Range: 9A to 85A

Covers a versatile spectrum of small-to-medium asynchronous motors. The UKQ series features three primary frame sizes—UKQ-22MB, UKQ-40MB, and UKQ-85B—providing a precise match for diverse industrial load requirements.

IP44 Environmental Protection

Equipped with a ruggedized, sealed enclosure designed to effectively resist solid objects and water ingress. This structural integrity ensures consistent, reliable performance in demanding workshop environments and standalone equipment setups.

Integrated Thermal Overload Protection

Built-in protection mechanisms react precisely to overcurrent conditions. By monitoring current flow directly within the core assembly, the system proactively prevents motor burnout and extends equipment lifespan.

Rugged Metal Enclosure Architecture

The UKQ-85B magnetic starter offers a specialized metal case variant, engineered specifically to withstand physical impact and harsh operational demands in heavy industrial sectors.

4 Systematic Steps to Specify Your Magnetic Starter

  1. Determine Motor FLA: Verify the motor nameplate’s Full Load Amperage (FLA). Match your motor to our specific modules: 22MB (9–22A), 40MB (32–40A), or 85B (50–85A).
  2. Define the Operational Duty: Ensure the unit is deployed for standard Direct-On-Line (DOL) starting sequences tailored for three-phase squirrel cage induction motors.
  3. Specify the Enclosure Material: Select our IP44-rated plastic casing for standard indoor environments, or opt for the metal-clad 85B model where superior mechanical impact resistance is required.
  4. Calibrate Thermal Protection: Post-installation, adjust the integrated thermal dial to match the motor’s rated FLA. This precise calibration is critical for ensuring reliable trip response during overcurrent events and protecting your asset.

Pump Houses, Fan Decks, and Compressor Bays: Starters at Work

KRIPAL UKQ magnetic starters provide factory pre-wired DOL motor starting for three-phase induction motors in environments where push-button local control and integrated overload protection simplify field wiring and reduce commissioning time.

Municipal Water and Wastewater Pump Control

IP44 enclosed UKQ starters protect submersible and dry-pit pump motors in water treatment plants, sewage lift stations, and storm water pump houses. The integrated thermal overload relay prevents motor burnout during dry-run and locked rotor conditions common in pumping applications.

Ventilation and Dust Collection Fan Decks

UKQ starters drive ventilation supply fans, dust collection blowers, and cooling tower fan motors in manufacturing plants. Factory pre-wired configuration eliminates on-site contactor-to-overload wiring and push-button integration, reducing electrician hours per installation.

Workshop Air Compressor and Conveyor Bays

UKQ starters handle air compressor motors in workshop pneumatic systems and conveyor belt drives in material handling lines. Push-button start/stop with illuminated overload trip indication provides operators with clear motor status at a glance without opening the enclosure door.

Equip Your Panels with Pre-Wired Motor Starters

  • Complete Starter Kits: Order UKQ magnetic starters as factory pre-wired assemblies with contactor, overload relay, and enclosure in one part number, eliminating component matching and field wiring errors.
  • Motor Sizing Support: Provide your motor nameplate data and our engineers specify the correct starter with overload setting range matched to your full-load amps.
  • Project Volume Discounts: Factory direct pricing for panel builder quantities with scheduled delivery aligned to your project timeline.
Pump Houses, Fan Decks, and Compressor Bays: Starters at Work

Pre-Wired Starter Assembly: Factory Built, Field Ready

KRIPAL magnetic starters ship as completely wired and tested assemblies | contactor, thermal overload relay, push buttons, and IP44 metal enclosure integrated and functionally verified before crating. The panel builder or installer connects incoming power and motor leads; the inter-component wiring is already proven.

100% Functional Test Before Shipment

Every UKQ starter undergoes a powered functional test: contactor pull-in voltage verified, overload trip calibration checked against the specified setting range, and push-button start/stop sequencing confirmed. Test reports accompany each export shipment.

IP44 Enclosure with Pre-Drilled Cable Glands

The powder-coated steel enclosure arrives with cable entry knockouts and glands pre-installed per your specification, eliminating the on-site drilling and gland fitting that consumes electrician time during field installation.

Component Traceability Within the Assembly

Each sub-component inside the UKQ starter (contactor, overload relay, push button) carries its own production lot code linked to the assembly serial number. If a field issue arises, KRIPAL traces the fault to the specific sub-component batch, not the entire assembly.

Project-Wide Standardization for Pump Station Builds

For water and wastewater projects deploying dozens of identical starters across a pump station, KRIPAL manufactures the full order as a single production batch, guaranteeing identical component revisions and overload setting ranges across every unit.

Spare Parts Kits Per Project

KRIPAL supplies recommended spare contactor coils, overload relay elements, and push-button contacts with each project shipment | calculated as a percentage of the installed base so your maintenance team has spares on the shelf from day one.

Distributor Stock: Ready-to-Ship Starters

KRIPAL warehouses pre-built UKQ starters in popular current ratings for distributors who need next-day shipment. No waiting for assembly when your customer’s pump motor has failed and needs a replacement starter immediately.

Private Label Enclosure Branding

Custom branding includes your logo on the nameplate, schematics in the door pocket, and branded warranty cards—ensuring the starter aligns perfectly with your company’s brand identity.

Direct Pump Application Engineering

Pump station designers and panel builders speak directly with KRIPAL engineers for starter selection based on pump motor data, overload class selection for submersible vs. dry-pit motors, and enclosure IP rating guidance for outdoor installations.

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Frequently Asked Questions

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A magnetic motor starter is a DOL assembly combining a contactor and thermal overload relay to start and protect a three-phase motor. KRIPAL UKQ starters include both in an IP44 enclosure.
A contactor only switches the motor circuit. A magnetic starter adds overload protection and often an enclosure. KRIPAL UKQ series provides a complete factory-built starter.
It acts as an automated, safe-control bridge. Pressing "Start" energizes an electromagnetic coil, closing the contactor to power the motor.Simultaneously, the integrated overload relay constantly monitors current to automatically cut power if an overcurrent is detected, preventing motor burnout.
You likely need one if your application involves three-phase induction motors. It is essential if you require: 1.Active Motor Protection: Safeguarding against overcurrent and phase imbalance. 2.Operational Safety: Controlling high-voltage equipment via low-voltage push buttons. 3.Installation Efficiency: Utilizing a pre-wired, all-in-one assembly to save on wiring labor and footprint.
Use a magnetic starter for remote or automatic motor control with contactor-based switching. Use a manual motor starter when local operator control is required.
The UKQ series provides a "factory-built, field-ready" solution. Unlike loose components, the UKQ integrates the contactor, overload relay, and push-button controls into a single, pre-tested, IP44-rated assembly, drastically reducing your setup time and field wiring errors.
Yes. KRIPAL is a professional magnetic starter manufacturer and exporter supplying UKQ DOL starters factory direct worldwide.

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