STA4D-00 - Yokogawa - Dual-Redundant Pressure Clamp Terminal Block for Analog I/O, 16-Channel

Product Overview

The STA4D-00 is a dual-redundant pressure clamp terminal block designed for Yokogawa ProSafe-RS and CENTUM VP analog I/O modules. It provides 16-channel field wiring termination with pressure clamp technology, enabling tool-free wire installation and secure retention for analog signals in safety and process control systems.

Key Specifications

• Type: Pressure clamp terminal block
• Configuration: Dual-redundant ready
• Channels: 16
• Connection: Pressure clamp (spring-clamp) terminals
• Withstand Voltage: 500 V AC
• Insulation Resistance: ≥ 100 MΩ (at 500 V DC)
• Dimensions: 65.6 × 72 × 52.3 mm
• Weight: 0.3 kg
• Operating Temperature: -10°C to +55°C
• Humidity: 5% to 95% RH, non-condensing
• Compatible Modules: SAI143, SAI533, SAV144 (with /A4D00 option code)

Features & Benefits

1. Tool-Free Pressure Clamp: Spring-clamp terminals allow fast, secure wire termination without screwdrivers, reducing installation time and human error.
2. Dual-Redundant Ready: Designed to support dual-redundant I/O configurations when paired with redundant analog modules.
3. Compact Footprint: 65.6 × 72 × 52.3 mm dimensions enable high-density mounting in space-constrained control cabinets.
4. Built-In Surge Absorber: The STA4D-00 includes integrated surge protection to clamp transients at the field boundary.
5. Wide Temperature Range: Operates from -10°C to +55°C for flexibility in climate-controlled and uncontrolled enclosures.

FAQ

Q: What wire gauge does the pressure clamp accept?
A: The STA4D-00 typically accepts 0.2 to 2.5 mm² (AWG 24 to 14) solid or stranded wire. Ferrules are recommended for stranded conductors.

Q: What is the difference between STA4D-00 and STA4S-00?
A: The STA4D-00 is a dual-redundant pressure clamp terminal block. The STA4S-00 is a single pressure clamp terminal block for non-redundant configurations.

Q: Can the STA4D-00 be used with non-safety analog modules?
A: Yes, the terminal block is electrically compatible with standard CENTUM VP analog I/O modules. Verify the module's option code (/A4D00) to ensure mechanical compatibility.

Installation Guide

• Mount the terminal block on a 35 mm DIN rail or panel inside the control cabinet.
• Strip wires to the recommended length and insert into the pressure clamp openings.
• Tug-test each wire to verify the spring clamp has engaged securely.
• Connect the terminal block to the I/O module using the appropriate AKB331 or KS1 cable.
• Ground shielded cable drains at a single point to avoid ground loops across redundant paths.

Selection Tips

• Redundancy Planning: For dual-redundant analog loops, always specify the STA4D-00 (dual) rather than the STA4S-00 (single).
• Wire Preparation: Use insulated ferrules on all stranded wires to prevent stray strands and ensure consistent clamp pressure.
• Surge Requirements: The STA4D-00 includes surge protection. For additional protection, external surge suppressors can be installed upstream.