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Magnetic Motor Starters for DOL Three-Phase Motor Control

KRIPAL pre-wired DOL magnetic motor starters integrate a contactor, thermal overload relay, and ON/OFF push buttons into a single, ready-to-install unit designed for the direct control and protection of three-phase motors ranging from 9A to 85A. These starters offer reliable defense against overload and phase loss, with options for both plastic and steel enclosures featuring General (W1) or Special (Q) protection ratings to suit various environmental requirements. Ideal for pump, fan, and compressor applications, the factory-wired assembly simplifies installation and ensures high performance through features like ambient temperature compensation.

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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, thermal overload relay, and manual ON/OFF push buttons into one unified, pre-wired 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, with rated currents ranging from 9A to 85A. The UKQ series provides a precise match for diverse industrial load requirements through a wide variety of model specifications, including the MB (Steel case with button) and B (Plastic case) variants.

Environmental Protection and Enclosure Types

Available in both plastic and steel cases, categorized into General Protection (W1) and Special Protection (Q) types. This structural variety allows for consistent, reliable performance by effectively resisting external elements 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 provides phase-loss sensitivity and ambient temperature compensation to proactively prevent motor burnout and extend equipment lifespan.

Rugged Enclosure Architecture

The series offers specialized metal case variants (Steel case) engineered specifically to withstand physical impact and harsh operational demands in heavy industrial sectors, while also providing plastic case options for standard applications.

4 Systematic Steps to Specify Your Magnetic Starter

  1. Determine Motor FLA: Verify the motor nameplate’s Full Load Amperage (FLA). Match your motor requirements to our available model ranges, such as the 9A–22A (UKQ-9MB to UKQ-22MB), 32A–40A (UKQ-32MB to UKQ-40MB), or 50A–85A (UKQ-50B to UKQ-85B).
  2. Define the Operational Duty: Ensure the unit is intended for Direct-On-Line (DOL) starting sequences for three-phase squirrel-cage induction motors. These starters are suitable for AC motors operating at 50Hz or 60Hz with rated voltages up to 550V.
  3. Specify the Enclosure and Protection Type: Select the appropriate enclosure based on your environment: choose plastic cases for standard applications, or iron (steel) cases for more robust requirements. Additionally, specify the protection type required: General Protection (W1) or Special Protection (Q).
  4. Calibrate Thermal Protection: Post-installation, ensure the thermal overload relay is correctly set to match the motor’s rated FLA. This calibration provides essential protection against overload, phase loss, and no-voltage conditions, ensuring reliable operation and equipment longevity.

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, offering localized push-button control and integrated overload protection to simplify field wiring and accelerate commissioning.

Municipal Water and Wastewater Pump Control

Available with robust enclosure options, UKQ starters protect pump motors in water treatment plants and sewage lift stations. The integrated thermal overload relay provides essential protection against motor burnout caused by overloads, phase loss, and no-voltage conditions.

Ventilation and Dust Collection Fan Decks

UKQ starters drive ventilation fans, dust collection blowers, and cooling tower motors in manufacturing facilities. The factory pre-wired configuration streamlines installation by eliminating complex secondary wiring, significantly reducing labor hours per unit.

Workshop Air Compressor and Conveyor Bays

UKQ starters are ideal for workshop air compressor motors and material handling conveyor drives. The intuitive ON/OFF push-button interface allows operators to control the motor and easily monitor status without accessing internal components.

Equip Your Panels with Pre-Wired Motor Starters

  • Complete Starter Kits: Order UKQ magnetic starters as ready-to-install, pre-wired assemblies—including the contactor, overload relay, and protective enclosure—under a single part number to eliminate assembly errors.
  • Motor Sizing Support: Submit your motor nameplate data, and our technical team will specify the correct starter with an overload setting range precisely matched to your full-load amperage (FLA) requirements.
  • Project Volume Discounts: Benefit from factory-direct pricing for high-volume orders, with delivery schedules aligned to your specific project timelines.
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, integrating the contactor, thermal overload relay, and push buttons into a unified enclosure that is functionally verified before shipment. Installers only need to connect incoming power and motor leads, as all inter-component wiring is pre-proven.

100% Functional Test Before Shipment

Every UKQ starter undergoes a rigorous powered functional test: contactor pull-in voltage is verified, overload trip calibration is checked against the specified range, and push-button start/stop sequencing is confirmed.

Enclosure and Cable Entry Options

Units are available in either plastic or steel enclosures, with General (W1) or Special (Q) protection ratings. Enclosures can be provided with pre-configured cable entries to minimize on-site drilling and gland fitting, saving valuable installation time.

Component Traceability Within the Assembly

Each sub-component within the UKQ starter (contactor, overload relay, and push button) is linked to the assembly’s production lot code. This ensures that KRIPAL can trace potential field issues to specific component batches rather than the entire unit.

Project-Wide Standardization

For large-scale water and wastewater projects, KRIPAL manufactures orders as single production batches, guaranteeing identical component revisions and overload setting ranges across all units in the deployment.

Spare Parts Kits Per Project

KRIPAL provides recommended spare contactor coils, overload relay elements, and push-button contacts with each project shipment, ensuring your maintenance team is equipped from day one.

Distributor Stock: Ready-to-Ship Starters

KRIPAL maintains warehouse stock of pre-built UKQ starters in popular current ratings to support immediate replacement needs when motor control failures occur.

Private Label Enclosure Branding

Custom branding options are available, including company logos on nameplates, schematics in door pockets, and branded documentation to ensure the unit aligns with your brand identity.

Direct Pump Application Engineering

Designers and panel builders can consult directly with KRIPAL engineers for expert guidance on starter selection based on motor data, overload protection classes for specific pump types (submersible vs. dry-pit), and enclosure protection ratings for diverse environments.

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Frequently Asked Questions

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A magnetic motor starter is a DOL (Direct-On-Line) assembly that combines a contactor and a thermal overload relay to control and protect three-phase motors. KRIPAL UKQ series starters integrate these components into a single, factory-pre-wired enclosure, available in both plastic and steel cases with General (W1) or Special (Q) protection ratings.
A contactor functions solely to switch the motor circuit, whereas a magnetic starter adds essential overload protection and typically includes a protective enclosure. The KRIPAL UKQ series provides a complete, factory-built assembly, eliminating the need to source and wire individual components.
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, especially if you require:1.Active Motor Protection: Safeguarding against overload, phase loss, and no-voltage conditions. 2.Operational Safety: Controlling high-voltage equipment using integrated push-button control. 3.Installation Efficiency: Utilizing a pre-wired, all-in-one assembly to reduce wiring labor and save installation space.
Use a magnetic starter for remote or automatic motor control through contactor-based switching. Use a manual motor starter when you specifically require local, mechanical operator control.
The UKQ series provides a "factory-built, field-ready" solution. Unlike loose components, the UKQ integrates the contactor, thermal overload relay, and push-button controls into a single, pre-tested, and protected assembly, which drastically reduces setup time and field wiring errors.
Yes. KRIPAL is a professional manufacturer and exporter, supplying UKQ DOL magnetic starters factory-direct to global markets.

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