Product Overview

The Yokogawa SPW481-13 S1 is a high-reliability power supply module engineered specifically for the ProSafe-RS Safety Instrumented System (SIS). This module acts as the primary energy source for safety control units and field instrumentation, converting a nominal 100-120V AC input into a stable, regulated 24V DC output. Designed for 19-inch rack mounting, it provides the clean electrical foundation necessary to maintain functional safety integrity. By preventing voltage fluctuations and spurious trips, the SPW481-13 S1 ensures that critical protective functions remain active in high-stakes industrial environments.

Technical Characteristics

The SPW481-13 S1 is defined by its adherence to rigorous safety standards and industrial durability:

Functional Safety Compliance This module is designed to support systems requiring SIL 3 (Safety Integrity Level 3) capabilities. It complies with international safety standards IEC 61508 and IEC 61511-1, making it an essential component for safety-critical loops where power failure could compromise personnel or environmental protection.

Superior Environmental Resilience Built to withstand harsh industrial climates, the module is rated for an expansive operating temperature range of -20°C to +70°C. It meets ISA Standard G3 specifications for corrosive resistance, ensuring the internal electronics remain protected against humidity and chemical contaminants common in processing plants.

System Integration and Redundancy The SPW481-13 S1 is optimized for use alongside the SCP461 safety control processor. It supports redundant power configurations, allowing for bumpless failover should one power source encounter an issue. This redundancy is vital for continuous process industries where downtime is not an option.

Efficient Thermal Management The module’s architecture is focused on low heat dissipation and high conversion efficiency. This compact design (3.3cm width) allows for high-density installation in control cabinets while maintaining the thermal stability required for long-term component lifecycle.

Technical Specifications

• Brand: Yokogawa

• Model Number: SPW481-13 S1

• Module Type: Power Supply Module

• Input Voltage: 100-120 V AC (Wide tolerance range)

• Output Voltage: 24 V DC (Regulated/Isolated)

• System Series: ProSafe-RS Safety Instrumented System

• Safety Certifications: IEC 61508, IEC 61511-1

• Environmental Rating: ISA G3 (Corrosive environments)

• Operating Temperature: -20°C to +70°C

• Weight: 0.3 kg

• Dimensions: 3.3 x 10.7 x 13 cm

• Origin: Japan

Application Areas

The Yokogawa SPW481-13 S1 is a core component for power distribution in specialized safety sectors:

• Petrochemical Refining: Powering Emergency Shutdown (ESD) systems and Fire & Gas (F&G) units.

• Chemical Manufacturing: Providing energy for safety interlocks and reactor cooling control loops.

• Offshore Platforms: Reliable power for critical safety systems in salt-spray and corrosive environments.

• Power Generation: Supporting high-integrity protection systems for boilers and turbines.