Products Unlimited contactors and control transformers

Products Unlimited components: 3100 series definite purpose contactors, 4000 series control transformers, and electromagnetic switching relays.

Definite purpose contactors Products Unlimited 3100 series

Products Unlimited 3100 series definite purpose contactors provide dependable circuit switching across refrigeration units, industrial chillers, and heavy motor drives. Frame configurations span one to four poles with continuous current ratings from 20 to 120 FLA.

Single-pole, two-pole, three-pole, and four-pole mechanical contact frameworks
Silver cadmium oxide contact tips engineered for repeated inductive switching
Universal footprint mounting brackets enabling direct equipment retrofitting
Dual quick-connect terminations combined with heavy-duty box terminal lugs

Step-down control transformers Products Unlimited 4000 series

Products Unlimited 4000 series Class II energy-limited control transformers convert primary plant voltages down to 24 VAC levels for solid-state logic boards and environmental thermostats. Output capacities span 5 to 150 VA across footprint configurations.

Step-down conversion handling primary line voltages up to 480 VAC at 50/60 Hz
Inherently energy-limited electrical design eliminating external secondary fusing
UL Class B insulation system rated for continuous operation at 130 degrees
Chassis foot-mounting brackets and direct panel flange mounting assemblies

Industrial electromagnetic relays Products Unlimited 9100 and 9400

Products Unlimited 9100 and 9400 series power switching relays provide dependable electrical isolation and circuit routing for commercial fans, heaters, and auxiliary motors. Enclosed and open designs operate continuously across fluctuating industrial environments.

Versatile contact forms including SPST-NO, SPDT, and heavy DPDT arrangements
Robust electromechanical mechanism providing extended switching durability
Wide selection of AC and DC drive coils spanning ratings from 12V to 277V
Multi-position mechanical mounting without affecting contact break gaps

Replacement electromagnetic contactor coils Products Unlimited

Products Unlimited magnetic actuator coils deliver positive contact engagement across fluctuating control circuit lines. Encapsulated winding profiles and protective outer dust covers prevent moisture penetration and particulate contamination inside motor control panels.

Standard alternating current voltages matching 24V, 120V, 240V, and 480V networks
Double-E laminated magnetic core structure lowering inrush volt-ampere demand
Protective dust covers safeguarding internal coil windings from particulate
Dual quick-connect spade terminals facilitating rapid wiring during retrofit

Replacement contact assemblies and refurbishment kits Products Unlimited

Products Unlimited contact replacement kits restore full electrical conductivity across heavy-duty definite purpose contactors. Complete assemblies include stationary and movable contact points, calibrated return springs, and high-dielectric carrier moldings.

Silver-alloy contact pads delivering prolonged resistance against arc erosion
Precision return springs ensuring simultaneous pole separation upon release
Thermoset plastic carrier moldings providing robust dielectric insulation
Field replacement workflow completed without unbolting plant busbar conduits

Mounting hardware, terminal blocks, and retrofit brackets Products Unlimited

Products Unlimited mechanical mounting plates, terminal lugs, and adapter assemblies simplify the installation of contactors and transformers into pre-existing switchgear enclosures. Components provide vibration resistance and mechanical rigidity.

Zinc-plated structural steel brackets protecting against atmospheric oxidation
Heavy-duty box lugs accommodating incoming wiring sizes from 14 to 4/0 AWG
Snap-on auxiliary switch modules for remote feedback and status monitoring
Adapter plates matching multiple historical mounting hole configurations

Design principles and performance parameters of Products Unlimited 3100 contactors

Products Unlimited 3100 series definite purpose contactors are engineered for reliable electrical switching across industrial HVAC chillers, air compressors, and heavy refrigeration circuits.

Heavy-duty molded housings fabricated from thermoset dielectric polymers deliver robust thermal resistance and absorb mechanical vibration generated by plant machinery.

Stationary and moving contact tips utilize silver cadmium oxide alloy compositions, providing high resistance to arc erosion during inductive current interruption cycles.

Contactor frames accommodate plant power conductor terminations through heavy-duty box terminal lugs and double quick-connect male spade terminals for rapid field wiring.

Step-down control transformers Products Unlimited 4000 series functionality

Products Unlimited 4000 series Class II energy-limited power transformers step down incoming plant distribution lines to standardized 24 VAC levels for thermostats, logic controls, and solid-state modules.

The engineered core impedance provides intrinsic overcurrent protection without necessitating external secondary fuse protection blocks.

Transformer coil windings incorporate UL Class B insulation systems rated for continuous duty up to one hundred thirty degrees Celsius, preventing dielectric breakdown under prolonged operational heat.

Standard mechanical enclosures feature sturdy chassis foot-mounting brackets and direct panel flange mounting configurations for electrical enclosures.

Industrial electromagnetic switching relays Products Unlimited 9100 and 9400 series

Heavy-duty switching relays within the Products Unlimited 9100 and 9400 lines handle intermediate power routing across ventilation fans, industrial heaters, and fluid pump assemblies.

Compact physical dimensions permit high-density arrangement across modular subpanels inside standardized industrial automation cabinets.

The precision electromechanical mechanism incorporates calibrated return springs, facilitating positive armature travel and synchronized contact break gaps when the electromagnetic coil de-energizes.

Heavy silver-alloy contact arrangements deliver hundreds of thousands of dependable operations under full rated inductive operating loads.

Contactor actuator coils and protective enclosure assemblies

Products Unlimited magnetic actuator coils generate positive pull-in force to complete mechanical contact closure even during line voltage dips caused by plant motor startup sequences.

The optimized double-E laminated magnetic core structure limits inrush volt-ampere demand and maintains moderate operating temperatures during continuous duty.

Durable polymeric dust covers shield the moving core assembly and magnet wire windings, preventing airborne metallic debris, dust, and particulate contamination from degrading contactor performance.

Control circuit terminations feature standard binding head screws and dual quick-connect tabs designed for rapid retrofit installation.

Refurbishment procedures, contact replacement kits, and equipment lifespan

Maintaining long-term operational dependability across heavy-duty compressor contactors involves structured visual inspections and timely renewal of worn switching surfaces.

Utilizing manufacturer-engineered contact renewal kits restores initial electrical conductivity and prevents costly premature replacement of complete contactor assemblies.

Refurbishment packages comprise stationary contact assemblies, movable contact bridges, calibrated pressure springs, and precision guide moldings.

Every replacement component conforms to strict geometric dimensional tolerances, guaranteeing uniform contact pressure and simultaneous multi-pole contact touch across all phases.

Mounting adapter brackets, wiring interfaces, and equivalent component matching

Installation of Products Unlimited contactors and control transformers into electrical control cabinets utilizes standardized universal adapter plates and mounting feet.

Corrosion-resistant zinc plating applied over structural steel hardware protects mounting interfaces against oxidation in humid industrial environments.

When upgrading existing automation lines, technical component selection is performed using factory equipment nameplate data, serial numbers, and electrical rating tables.

Comprehensive load analysis ensures correct contactor sizing, thermal compatibility, and streamlined field power distribution integration.

Products Unlimited and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Products Unlimited and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.