ICS Triplex T9902 Replacement Output Fuse

The ICS Triplex T9902 is a dedicated replacement output fuse used in Trusted® Triple Modular Redundant (TMR) digital output modules, specifically the T9851 and T9852 series. It provides overcurrent protection to safeguard downstream field devices and internal circuitry during fault conditions.

This fuse integrates the Littelfuse SMF Omni-Block platform, which ensures consistent trip characteristics and reliable performance under electrical stress. Its construction combines a ceramic body with high-grade aluminum alloy contacts, delivering thermal stability and mechanical robustness.

Key Technical Characteristics

• Rated Current: 10 A
• Type: Fast-acting
• Voltage Rating: Up to 480 V AC/DC
• Compatible Modules: T9851, T9852 Digital Output Modules
• Fuse Platform: Littelfuse SMF Omni-Block
• Operating Temperature: –20°C to +70°C
• Ingress Protection: IP67 (dust-tight and protected against immersion)
• Certifications: UL listed, CE marked, RoHS compliant

Physical and Logistics Data

Application and Maintenance Guidance

Maintenance teams use the T9902 during routine servicing or after fault events in safety-critical systems such as nuclear plants, refineries, and chemical processing facilities. Because the Trusted architecture relies on precise current limiting, only genuine T9902 fuses should be installed to maintain system integrity and certification.

The IP67 rating allows storage or temporary exposure in harsh environments without degradation. Furthermore, its fast-acting response prevents cascading failures by quickly isolating short circuits or overloads on individual output channels. Always replace fuses in accordance with ICS Triplex maintenance procedures to preserve redundancy and diagnostic accuracy.