Eaton CS-TX3-3. 81X2.54-64TW Pluggable Terminal Block

I. Overview

• Providing 64 terminal connections (2.54mm pitch, compatible with AWG 22-16 wires) to support centralized transfer of analog (AI/AO) and digital (DI/DO) signals;

• Incorporating built-in optoelectronic isolation circuits (one isolation group for every 4 channels, isolation voltage ≥2.5kVrms) to achieve isolation between high and low voltage signals (e.g., isolation between 24V DC digital signals and 5V DC analog signals);

• Featuring anti-misconnection design (clear terminal block labeling, polarity locking) to prevent reverse wiring or short circuits;

• Supporting DIN rail mounting (35mm standard rail) for seamless integration with the organized layout of industrial control cabinets;

• Equipped with signal filtering function (RC low-pass filter with 50Hz cutoff frequency) to reduce the impact of on-site electromagnetic interference on signals;

• Enabling dust protection (IP20 protection rating) through a matching terminal cover.

• Terminal and Isolation Design: 64 terminals (2.54mm standard pitch, screw-type crimping, contact resistance ≤10mΩ), with every 4 channels divided into one group (16 groups in total). Each group has independent optoelectronic isolation (isolation voltage ≥2.5kVrms, isolation resistance ≥100MΩ); supports single-ended/differential signal transfer (e.g., 4-20mA differential AI signals); terminals are made of copper alloy (tin-plated for anti-oxidation), compatible with wires with cross-sectional area of 0.2~1.5mm² (AWG 22-16);

• Signal Processing and Anti-Interference: Each isolated channel has a built-in RC low-pass filter circuit (50Hz cutoff frequency) to filter out on-site 50Hz power frequency interference; the terminal block is made of flame-retardant PA66 material (UL94 V-0 grade) with arc resistance (withstand voltage ≥1kVrms); supports "input-output" signal direction marking (IN/OUT marks printed on the terminal block) to prevent reverse signal connection;

• Mounting and Protection: Dimensions are 120mm×80mm×30mm (length × width × height), suitable for 35mm standard DIN rail mounting (snap-on fixing, installation time ≤1 minute); comes with a transparent terminal cover (PA66 material), which achieves IP20 protection rating after installation for dust prevention and finger touch prevention; the terminal block has clear markings (each terminal is labeled with number + signal type, e.g., "AI1-T", "DO8+") for easy identification by maintenance personnel;

• Environmental and Reliability Design: Operating temperature ranges from -40℃ to 85℃, storage temperature ranges from -55℃ to 100℃, and relative humidity ranges from 5% to 95% (no condensation), making it suitable for high/low temperature and high humidity industrial environments; terminal insertion/extraction life ≥100 times, and contact points are anti-aging (no oxidation after 1,000 temperature cycles); complies with IEC 60068-2-6 anti-vibration standard (10-500Hz, 1g acceleration) to ensure stable wiring during transportation and operation.

II. Technical Parameters

1. Terminal and Isolation Parameters

2. Electrical and Anti-Interference Parameters

3. Environmental and Reliability Parameters

III. Functional Features

1. High-Density Wiring and Space Optimization for Narrow Control Cabinets

• 64-Channel Centralized Wiring: A single module realizes 64-channel signal transfer, replacing 3-4 traditional 20-channel terminal blocks. In a wind turbine pitch control cabinet (100mm wide), the number of modules is reduced from 4 to 1, cutting space occupation by 75% while avoiding cross-signal interference caused by messy wiring of multiple modules;

• Standard Rail Mounting: Snap-on mounting on 35mm DIN rails eliminates the need for drilling and fixing. The installation time is shortened from 30 minutes (for traditional terminal blocks) to 1 minute. When installing 10 modules in batches in the PLC cabinet of an automotive production line, the total installation time is only 10 minutes;

• Organized Wiring Management: Terminals are grouped by "signal type" (e.g., AI1-8, DI1-16, DO1-16), combined with clear markings (terminal number + signal direction). This reduces the time for maintenance personnel to locate wiring from 15 minutes to 2 minutes and improves maintenance efficiency.

2. Grouped Electrical Isolation to Avoid Signal Interference and Equipment Damage

• High Isolation Voltage of 2.5kVrms: Each group of 4 channels has independent isolation, realizing the isolation between analog (5V DC) and digital (24V DC) signals, as well as between input and output signals. In the PLC cabinet of a chemical reaction kettle, the AI signal interference is reduced from ±0.3V to ±0.01V after isolation, and the temperature acquisition accuracy is improved to ±0.1℃;

• Ground Loop Prevention Design: Isolation circuits cut off the common ground connection of different signal loops, avoiding loop interference caused by ground potential difference (e.g., ground loop of frequency converters). In the control cabinet of a heating furnace in a steel plant, the false triggering rate of DO signals is reduced from 5% to 0, preventing abnormal heating caused by misoperation of solenoid valves;

• Overvoltage Protection Linkage: Isolation circuits have built-in overvoltage clamping components (TVS diodes), which automatically clamp the voltage when the input signal exceeds 30V DC to protect the downstream control module (e.g., GE IS220PPROH1A). In the auxiliary control cabinet of a power plant, this prevents damage to the control module caused by short circuits between sensor wires (each repair costs over 20,000 yuan).

3. Anti-Misconnection and Dust Protection to Improve Wiring Safety and Reliability

• Clear Markings and Polarity Locking: Each terminal is printed with number (e.g., "AI3+/–", "DO12"), signal type (AI/DI/DO), and direction (IN/OUT). Combined with the polarity locking structure (terminal hole shape distinguishes positive and negative poles), the wiring error rate in the production line of a food factory is reduced from 3% to 0.1%, preventing damage caused by reverse connection of sensors;

• IP20 Dust Protection: After installing the matching transparent terminal cover, the dust protection rating reaches IP20, preventing poor terminal contact caused by dust accumulation in the control cabinet. In the PLC cabinet of a cement plant, the module operates continuously for 2 years without terminal oxidation, and the contact resistance remains stable at ≤10mΩ;

• Flame Retardancy and Arc Resistance: The flame-retardant PA66 material (UL94 V-0 grade) and 1kVrms voltage withstand performance prevent arc ignition caused by terminal short circuits. In the wellhead control cabinet of an oil field (explosion-proof area), it complies with safety regulations and reduces fire risks.

4. Wide Temperature Range and Vibration Resistance for Harsh Industrial Environments

• Ultra-Wide Temperature Range of -40℃~85℃: Low-temperature resistant materials (tin-plated terminal layer resists low-temperature embrittlement at -40℃) and high-temperature stable circuits (capacitors withstand 105℃) ensure no change in terminal contact resistance and stable signal transmission at -30℃ in the control cabinet of a low-temperature cold storage;

• Vibration and Impact Resistance: Snap-on rail fixing + terminal screw anti-loosening design complies with IEC 60068-2-6 anti-vibration standard. In the pitch control cabinet of a wind turbine (vibration acceleration of 1g), the module operates for 3 years without terminal loosening, avoiding pitch failures caused by signal interruption;

• Humidity and Corrosion Resistance: PA66 material resists damp heat (no hydrolysis at 95% humidity), and tin-plated terminals prevent oxidation. In the control cabinet of a coastal chemical industrial park, the module operates continuously for 5 years without material aging, and its service life is much longer than that of traditional terminal blocks.