Chapter 8538 — Customs Tariff Headings

Automation Control Panel Rack

> A 19-inch standard rack chassis constructed from extruded aluminum, designed to house industrial automation panels of heading 85.37. It provides DIN rail mounting points and structural support but does not include any electrical devices, making it an unequipped base suitable for classification under tariff item 8538.10.00.

Electrical Distribution Console Frame

> An aluminum frame assembly intended for consoles that house boards of heading 85.37 for power distribution systems. It includes mounting rails and ventilation slots but no electrical components, qualifying as an unequipped base under tariff item 8538.10.00.

Elevator Control Desk Base

> An ergonomic operator desk base designed for elevator control consoles of heading 85.37. It includes cable ducts and mounting provisions but excludes buttons, displays, and relays, making it an unequipped base for tariff item 8538.10.00.

Fire Alarm Control Desk

> An operator desk base for fire alarm control panels of heading 85.37, made from flame-retardant materials. It excludes all detectors, annunciators, and modules, so it qualifies as an unequipped base under tariff item 8538.10.00.

Generator Control Panel Enclosure

> A weatherproof enclosure designed for standby generator control panels of heading 85.37, featuring sound attenuation. It does not include voltage regulators or transfer switches, making it an unequipped base under tariff item 8538.10.00.

HVAC Control Cabinet Frame

> A wall-mount frame for HVAC zone control panels of heading 85.37, with adjustable mounting brackets. It excludes sensors, relays, and wiring harnesses, qualifying as an unequipped base under tariff item 8538.10.00.

Industrial Control Panel Base

> A metal cabinet base specifically designed to support control boards and panels of heading 85.37, such as industrial PLC controllers. It provides structural support and wiring channels but lacks any electrical apparatus, making it an unequipped base under tariff item 8538.10.00.

Marine Electrical Console Base

> A corrosion-resistant base for shipboard electrical distribution consoles under heading 85.37, rated IP66. It excludes circuit breakers and instrumentation, qualifying as an unequipped base under tariff item 8538.10.00.

Motor Control Center Enclosure

> A modular enclosure system for motor control centers (MCCs) classified under heading 85.37, with bus bar supports but no starters or contactors. Constructed from steel and meeting UL standards, it qualifies as an unequipped base under tariff item 8538.10.00.

PLC Mounting Desk Base

> A steel desk-style base optimized for rack-mounting programmable logic controllers (PLCs) of heading 85.37. It includes cable management trays but no control devices or power supplies, making it an unequipped base under tariff item 8538.10.00.

Rail Signaling Console Base

> A heavy-duty base for railway signaling control consoles under heading 85.37, with vibration-resistant construction. It excludes all signaling relays and indicators, qualifying as an unequipped base under tariff item 8538.10.00.

SCADA System Rack Base

> A standard 19-inch rack base for SCADA control system panels under heading 85.37, with cooling airflow design. It excludes PLCs, HMIs, and power supplies, making it an unequipped base under tariff item 8538.10.00.

Solar Inverter Control Enclosure

> A NEMA-rated enclosure for solar power inverter control panels of heading 85.37, with heat dissipation fins. It excludes inverters and monitoring equipment, qualifying as an unequipped base under tariff item 8538.10.00.

Switchgear Cabinet Enclosure

> A floor-standing enclosure for medium-voltage switchgear panels of heading 85.37, constructed from sheet steel with IP-rated doors. It excludes all circuit breakers and relays, making it an unequipped base under tariff item 8538.10.00.

Wind Turbine Control Cabinet

> A heavy-duty cabinet base for wind turbine pitch/yaw control systems under heading 85.37, with extreme weather construction. It excludes variable frequency drives and sensors, qualifying as an unequipped base under tariff item 8538.10.00.

Bimetal Blade for Thermal Cutout Switch

A precision bimetal blade designed for thermal cutout switches used in appliances. It bends at a predetermined temperature to separate electrical contacts, preventing overheating and potential fires. Its metallic construction provides reliable mechanical temperature response for motor starters and overload protectors.

Bimetallic Disc for Circuit Breaker Thermal Trip

A snap-action bimetallic disc used for thermal trip mechanisms in thermal-magnetic circuit breakers. It warps mechanically at calibrated temperatures to trip the breaker mechanism and interrupt power. Its two-metal construction provides precise temperature response for overload protection.

Ceramic NTC Thermistor for Switch Overheat Detection

A ceramic NTC thermistor used for overheat detection in automatic circuit breakers and thermal switches. It provides precise temperature monitoring by decreasing resistance as temperature rises, enabling protective action. Its ceramic material is electrically reactive to temperature changes, suitable for motor starters and overload protectors.

Ceramic PTC Disk for Overload Relay Protection

A large ceramic PTC heating disk designed for bimetallic overload relays. It self-heats to trip the relay mechanism when motor current exceeds safe levels, providing both electrical and thermal protection. Its ceramic material reacts to temperature changes, making it suitable for motor starters and overload protectors.

Ceramic PTC Thermistor for Motor Protectors

A positive temperature coefficient (PTC) ceramic thermistor specifically designed for motor overload protectors. It increases resistance dramatically with temperature rise to limit current and protect motors from overheating. Its ceramic material is electrically reactive to temperature, making it ideal for motor starter and overload protector applications.

Ceramic Temperature-Sensitive Resistor for Motor Starter

A PTC ceramic resistor element used in motor starting relays. It provides inrush current limiting by increasing resistance as temperature rises during startup. This dedicated ceramic part is electrically reactive to temperature, making it suitable for motor starters and overload protectors.

Ceramic Thermal Protector Sensor for HVAC Relays

An NTC ceramic sensor for thermal protector relays in HVAC systems. It monitors compressor temperatures and signals relay cutoff via resistance change. Its temperature-electrically reactive ceramic material makes it suitable for motor starters and overload protectors.

Metallic Bimetal Strip for Relay Thermal Protection

A bimetallic strip made of two bonded metallic alloys for thermal snap-action relays. It mechanically deforms when heated to open or close electrical contacts, providing over-temperature protection. Its metallic material is mechanically reactive to temperature, making it suitable for motor starters and overload protectors.

Metallic Shape Memory Alloy Actuator for Switches

A Nitinol shape memory alloy wire actuator for temperature-sensitive switches. It contracts mechanically when reaching activation temperature to operate switch contacts. Its metallic material is mechanically reactive to temperature, making it suitable for motor starters and overload protectors.

Metallic Thermal Fuse Element for Appliance Protectors

A low-melting-point metallic alloy fuse wire for thermal cutouts in household appliances. It melts mechanically at precise temperature thresholds to break circuits during overheat conditions. Its metallic material is mechanically reactive to temperature, making it suitable for motor starters and overload protectors.

ATM Display Driver Printed Circuit Assembly

This printed circuit assembly (PCA) drives LCD or OLED displays in control panels classified under heading 8537, specifically for automatic teller machines. It handles graphics rendering and touch input processing, making it a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it is classified under tariff item 8538.90.20.

ATM Keypad Interface Printed Circuit Board

This printed circuit assembly serves as the interface board for keypads in control panels of heading 8537, used in automatic teller machines. It processes transaction inputs and security signals, functioning as a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it falls under tariff item 8538.90.20.

Automatic Data Processing PCA for 8537 Boards

This printed circuit assembly is designed for data routing in control panels of heading 8537, used in automatic data processing machines of heading 8471. It manages I/O between units, making it a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it is classified under tariff item 8538.90.20.

Crane Control System Expansion Board

This heavy-duty printed circuit assembly expands hoist and trolley controls in overhead crane control systems of heading 8537. It includes encoder interfaces, brake controls, and limit switch monitoring, handling high-current outputs. As a PCA, it is classified under tariff item 8538.90.20.

Electrical Panel HMI Interface Board

This printed circuit assembly provides a touchscreen interface for industrial control panels of heading 8536, with an LCD controller, touch digitizer, and communication processor. It enables operator interaction with control systems, making it a part suitable for use solely or principally with apparatus of heading 85.36. As a PCA, it falls under tariff item 8538.90.20.

Elevator Control Printed Circuit Assembly

This specialized PCB assembly is for elevator controllers under heading 8537, integrating motor drive circuits, safety interlocks, and floor position sensors. It manages door operations and car movement, qualifying as a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it is classified under tariff item 8538.90.20.

Fire Alarm Control Panel Interface Module

This printed circuit assembly interfaces smoke detectors and notification appliances with fire alarm control panels of heading 8537, featuring supervised circuits and power monitoring. It ensures life safety system integrity, making it a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it falls under tariff item 8538.90.20.

HVAC Zone Controller Expansion Module

This printed circuit assembly expands input/output capacity of HVAC zone controllers under heading 8537, with temperature sensor interfaces and damper actuator drivers. It enables multi-zone climate control functionality, qualifying as a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it is classified under tariff item 8538.90.20.

Industrial Relay Driver PCB Assembly

This is a printed circuit assembly designed to drive multiple relays in industrial control panels, incorporating power transistors, optocouplers, and signal conditioning circuits. It falls under tariff item 8538.90.20 as a part suitable for use solely or principally with apparatus of heading 85.36, specifically electrical switching and control equipment.

Machine Safety PLC I/O Module

This safety-rated printed circuit assembly is used in machine safety PLCs, featuring dual-channel inputs, safety relays, and diagnostic circuits compliant with ISO 13849. It is classified under 8538.90.20 as a part of heading 85.37 apparatus, specifically programmable logic controllers used for safety monitoring.

PCA for Word Processor Display Control Panel

This printed circuit assembly is for display control panels of heading 8537 in word processing machines of heading 8469. It handles display driving and user interface signals, qualifying as a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it falls under tariff item 8538.90.20.

Photocopier Laser Control Printed Circuit Board

This printed circuit assembly modulates laser diode operation for control panels of heading 8537 in photocopying apparatus. It provides raster image processing interface, making it a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it is classified under tariff item 8538.90.20.

Photocopier Scanner Motor Control PCA

This printed circuit assembly is for motor control in control panels of heading 8537 in photocopying apparatus. It manages scanner positioning and speed, qualifying as a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it falls under tariff item 8538.90.20.

PLC Printed Circuit Board Assembly

This printed circuit board assembly is designed for programmable logic controllers, containing microprocessors, memory chips, and I/O interface circuits. It is classified under 8538.90.20 as a part suitable for use solely or principally with PLCs of heading 85.37.

Plotter Servo Control PCA for 8537 Panels

This printed circuit assembly controls stepper or servo motors in control panels of heading 8537 for plotters. It ensures precise carriage movement, making it a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it is classified under tariff item 8538.90.20.

Power Distribution Unit Control PCB

This printed circuit assembly is used in power distribution unit control systems, monitoring circuit breakers and metering individual outlets. It falls under 8538.90.20 as a part of heading 85.36 apparatus, specifically electrical switching and control equipment for power distribution.

Printed Circuit Assembly for Photocopier Control Board

This printed circuit assembly is designed specifically for use in control panels of heading 8537 integrated into photocopying apparatus. It provides the electronic interface and control functions for the panel, qualifying as a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it falls under tariff item 8538.90.20.

Programmable Automation Controller Daughterboard

This expansion printed circuit assembly plugs into main PLC boards to add analog I/O channels and specialty communication protocols. It is classified under 8538.90.20 as a part suitable for use solely or principally with PLCs of heading 85.37.

Protective Relay Signal Processing Board

This high-speed printed circuit assembly is used in protective relays for power distribution systems, containing ADCs, DSP chips, and trip logic circuits. It falls under 8538.90.20 as a part of heading 85.36 apparatus, specifically electrical switching and protection equipment.

SCADA Remote Terminal Unit Processor Board

This industrial processor printed circuit assembly is used in SCADA remote terminal units, featuring a ruggedized CPU, serial ports, and analog I/O for field data acquisition. It is classified under 8538.90.20 as a part of heading 85.37 apparatus, specifically remote monitoring and control systems.

Solar Inverter MPPT Controller Board

This maximum power point tracking printed circuit assembly is used in photovoltaic inverters, with high-efficiency DC-DC converters and grid synchronization circuits. It falls under 8538.90.20 as a part of heading 85.36 apparatus, specifically electrical switching and control equipment for solar power systems.

Switchgear Monitoring PCB Module

This printed circuit assembly is used in low-voltage switchgear, equipped with current transformers, voltage sensors, and communication interfaces for status monitoring. It is classified under 8538.90.20 as a part of heading 85.36 apparatus, specifically electrical switching and protection equipment.

Telephone Base Station Control PCA

This printed circuit assembly is for power and signal control in control panels of heading 8537 for telephone base stations. It manages base station operations, making it a part suitable for use solely or principally with apparatus of heading 85.37. As a PCA, it is classified under tariff item 8538.90.20.

Traffic Signal Controller Interface PCB

This printed circuit assembly interfaces vehicle detectors with traffic signal controllers, featuring signal conditioning amplifiers and fault detection circuits. It falls under 8538.90.20 as a part of heading 85.37 apparatus, specifically traffic signal control systems.