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Reversing Contactors for Forward & Reverse Motor Control

KRIPAL manufactures professional reversing contactors with factory pre-wired mechanical and electrical interlocks for reliable bidirectional three-phase motor control, ranging from 9A to 800A. Each unit combines two standard UKC contactors with a precision mechanical interlock module that physically prevents simultaneous energization, effectively eliminating the risk of phase-to-phase short circuits in hoist, crane, conveyor, and gate drive applications. These contactors are engineered to meet both AC-3 and AC-4 duty ratings for demanding, frequent reversing cycles. Designed for complete motor starter assemblies, they are fully compatible with our thermal overload relays and modular auxiliary contact blocks, providing a robust and integrated solution for industrial electrical systems.

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Reversing Contactors for Forward & Reverse Motor Control
UKC1-100R 3-Pole Reversing Contactor 100A ac Coil 24V 110V 220V 380V
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UKC1-100R 3-Pole Reversing Contactor 100A ac Coil 24V 110V 220V 380V

Its interlocked contact design prevents simultaneous closure, ensuring reliable and safe forward/reverse operation for industrial applications.

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UKC1-85R 3-Pole Reversing Contactor 50/65/75/85A ac Coil 24V 110V 220V 380V
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UKC1-85R 3-Pole Reversing Contactor 50/65/75/85A ac Coil 24V 110V 220V 380V

Its interlocked contact design prevents simultaneous closure, ensuring reliable and safe forward/reverse operation for industrial applications.

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UKC1-22R 3-Pole Reversing Contactor 9/12/18/22A ac Coil 24V 110V 220V 380V
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UKC1-22R 3-Pole Reversing Contactor 9/12/18/22A ac Coil 24V 110V 220V 380V

Its interlocked contact design prevents simultaneous closure, ensuring reliable and safe forward/reverse operation for industrial applications.

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Reversing Contactor Selection Guide for Bidirectional Motor Control

A reversing contactor is a specialized electromechanical assembly engineered to control three-phase motor rotation by systematically swapping two supply phases. The KRIPAL UKC1-R series integrates dedicated forward and reverse contactors with factory-certified mechanical interlocks into a single, compact footprint—delivering reliable, safe bidirectional drive control for demanding industrial machinery.

Technical Specifications of the UKC1-R Series

Dual Interlock Architecture

Integrates a physical mechanical lever combined with an electrical auxiliary interlock, strictly preventing simultaneous closure and catastrophic phase-to-phase short circuits.

Phase Reversal Logic

Executes precise switching of two out of three supply phases, enabling seamless and safe bidirectional motor rotation for industrial applications.

Silver Alloy Contacts

Features robust contact materials providing superior arc extinction capabilities, specifically engineered to withstand the severe electrical stress of frequent rotational direction changes.

Broad Operational Range

Accommodates a wide spectrum of motor loads, scaling from the compact 22R chassis (9A to 22A) up to the heavy-duty 85R (32A to 85A) and 800R (100A to 800A) platforms.

Optimized Panel Footprint and UKH Compatibility

This consolidated unit replaces two separate contactors and external interlock hardware, significantly reducing enclosure volume. The architecture pairs directly with KRIPAL UKH thermal overload relays to establish a complete, fully protected motor reversing sequence.

4 Systematic Steps to Specify Your Reversing Contactor

  1. Select Motor FLA Capacity: Select Motor FLA Capacity: Evaluate continuous load requirements to determine the precise frame size: the 22R (9–22A), 85R (32–85A), or 100R–800R module.
  2. Define Utilization Category: Select AC-3 for standard motor switching; specify AC-4 for high-stress applications involving frequent plugging (rapid reversal) or inching.
  3. Confirm Control Circuit Voltage: Ensure the integrated dual-coil voltage parameters align strictly with your control power supply (e.g., 24V, 110V, 220V, or 380V AC).
  4. Integrate Overload Protection: Couple the assembly with a dedicated KRIPAL UKH thermal overload relay, calibrating the trip dial precisely to the motor’s nameplate FLA.

Cranes, Hoists, and Conveyors: Reversing Contactor Duty Cycles

KRIPAL UKR reversing contactors are engineered for bidirectional motor control in applications where direction changes occur every cycle—from overhead crane travel drives and construction hoists to reversing conveyor belts in high-throughput sorting and packaging lines.

Overhead Crane Bridge and Trolley Drives

UKR reversing assemblies provide precision control for bridge traverse and cross trolley motors in steel mills, shipyards, and large-scale warehouse overhead cranes. The factory-wired mechanical interlock prevents simultaneous forward and reverse coil energization, ensuring safety under aggressive plugging duty.

Construction and Material Hoists

Reversing contactors drive up/down hoist motors on construction sites where safety-critical interlocking prevents simultaneous direction commands. The integrated, pre-wired mechanical and electrical interlock assembly significantly reduces field wiring complexity and installation time.

Bidirectional Conveyor and Sorting Systems

UKR contactors manage conveyor direction reversals in parcel sorting hubs, airport baggage handling systems, and recycling material routing lines. These units are designed to withstand hundreds of direction changes per shift, ensuring reliability even under heavy-load starting conditions.

Reverse with Confidence: Factory-Wired, Mechanically Interlocked Assemblies

  • Ready-to-Install Assemblies: Our UKR reversing contactors arrive fully factory-wired and interlocked. This streamlined approach eliminates onsite configuration, drastically reduces field-wiring labor hours, and eliminates the risk of human error in interlock installation.
  • Application-Engineered Performance: Our engineering team analyzes your specific motor data and reversal frequency to ensure the chosen contactor size meets the rigorous electrical and mechanical endurance demands of your application.
  • Project-Scale Sourcing & Support: Partner with our dedicated export team for factory-direct pricing on large-scale hoist and crane projects, supported by coordinated batch-delivery scheduling tailored to your production milestones.
Cranes, Hoists, and Conveyors: Reversing Contactor Duty Cycles

Reversing Contactor Partnership: Engineering-Backed Supply

KRIPAL reversing contactors are shipped as factory-wired, mechanically and electrically interlocked assemblies, rigorously tested prior to crating. Panel builders and crane OEMs receive a ready-to-mount reversing solution that effectively eliminates the leading cause of field failure: incorrect interlock wiring.

Factory-Wired and Interlock-Tested

Every UKR assembly undergoes comprehensive functional testing to verify mechanical engagement and electrical contact sequencing before leaving our facility. Your panel team simply mounts and connects the three-phase power, with the interlock logic pre-proven.

Mechanical Interlock Precision

The interlock toggle, which physically prevents simultaneous contactor closure, is machined to a 0.1mm tolerance within KRIPAL’s internal tool room. This superior fit precision surpasses standard off-the-shelf, third-party interlock components.

Plugging Duty Endurance Testing

Reversing contactors operate under the harshest switching condition—plugging, where the motor is reversed against rotation. KRIPAL batch-tests sample assemblies under these extreme duty cycles and archives the data, ensuring the contactor can withstand your application’s worst-case electrical stress.

Crane and Hoist Project Logistics

For overhead crane modernization and new-build hoist projects, KRIPAL coordinates the delivery of reversing contactors alongside UKH thermal overload relays and pendant control stations as a consolidated, turnkey crane control package.

Spare Component Availability

We maintain dedicated stock for replacement mechanical interlock assemblies and coil kits. This supports your maintenance teams with immediate access to critical spare parts, bypassing the need for made-to-order production lead times.

CE and IEC Technical Support

Our technical documentation is meticulously prepared for Machinery Directive conformity assessment, providing verified component compliance data to support your hoist or crane CE marking process.

Private Labeling Capabilities

We offer comprehensive private labeling services, including printing your wiring schematics on enclosure labels, laser-marking your proprietary part numbers, and utilizing branded packaging, ensuring KRIPAL remains a seamless, “invisible” supply chain partner.

Dedicated Application Engineering

Crane and hoist OEM engineers have direct access to KRIPAL application specialists who possess deep expertise in plugging duty, reversal frequency limits, and interlock sequencing requirements, ensuring you receive expert technical guidance rather than generic support.

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Frequently Asked Questions

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A reversing contactor is a specialized assembly comprising two interlocked contactors that systematically swap two motor supply phases to change rotational direction. To ensure safety, a dual-interlock system guarantees that only one contactor is energized at any given time. The KRIPAL UKC1-R series arrives factory-assembled, providing a reliable, ready-to-use solution for bidirectional motor control.
Simultaneous closure of both contactors would result in a catastrophic phase-to-phase short circuit. KRIPAL UKC1-R contactors incorporate both mechanical and electrical interlocks as standard, providing redundant protection to ensure safe operation in demanding industrial environments.
A standard contactor is designed for unidirectional motor operation. In contrast, a reversing contactor consists of two factory-interlocked contactors housed in a single assembly, enabling both forward and reverse rotation—making it essential for hoists, cranes, and conveyors.
Selection should be based on your motor's Full Load Amperage (FLA), the required utilization category (AC-3 for standard switching or AC-4 for high-frequency reversing), coil voltage specifications, and dimensional constraints. KRIPAL offers a comprehensive range, including the 22R, 85R, and 100R–800R models to suit diverse industrial loads.
Yes. As a dedicated manufacturer and professional exporter, KRIPAL supplies the UKC1-R series factory-direct to global B2B customers, offering customized labeling, technical support, and project-scale logistics for OEMs and panel builders.

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