ICS Triplex Trusted T9902 Replacement Output Fuse

Product Overview

The ICS Triplex T9902 serves as a precision-engineered replacement fuse designed specifically for the Trusted Triple Modular Redundant (TMR) Digital Output modules, such as the T9851 and T9852. This 10A fast-acting fuse utilizes the Littelfuse SMF Omni-Block architecture to provide a stable and resettable protection interface. By incorporating this specialized fuse, the Trusted system isolates electrical faults at the individual channel level, which prevents localized overcurrent events from damaging the expensive internal circuitry of the output module.

Functional Capabilities

• Active Circuit Protection: The T9902 actively monitors the current flow to the field load and interrupts the circuit instantly when it detects an overcurrent condition. This proactive response effectively shields the TMR architecture from external electrical surges.
• High-Integrity Materials: ICS Triplex constructs the T9902 using a high-grade aluminum alloy and ceramic body. Consequently, the fuse maintains its structural integrity even under the thermal stress of a high-energy blow.
• Environmental Resilience: Because the unit features an IP67 resistance level, it remains impervious to dust and moisture ingress. This makes the T9902 exceptionally reliable for use in offshore or tropical industrial environments where humidity is a constant factor.
• Wide Voltage Versatility: The fuse supports operating voltages up to 480V AC/DC. Therefore, it provides dependable protection across a diverse range of field device power requirements without compromising system efficiency.
• Seamless Maintenance: Designed as a “plug-and-play” component for the I/O base unit, the T9902 allows maintenance teams to restore channel functionality rapidly. This minimizes system downtime and ensures that the safety loop returns to its fully operational state with minimal delay.

Technical Specifications

• Brand: ICS Triplex (Rockwell Automation)
• Model Number: T9902
• Product Series: Trusted TMR System
• Compatible Modules: T9851, T9852 Digital Output Modules
• Current Rating: 10A (Fast-Acting)
• Maximum Voltage: 480V AC/DC
• Operating Temperature: –20°C to +70°C
• Protection Rating: IP67
• Dimensions: 3.0 x 30.2 x 26.5 cm (Package/Carrier dimensions)
• Weight: 1.26 kg

Primary Applications

Maintenance engineers routinely deploy the T9902 within the Trusted I/O framework in safety-critical sectors like oil and gas, chemical processing, and power generation. Because the T9851/2 modules often drive heavy solenoids and actuators, the T9902 remains indispensable for protecting the system against field wiring shorts. Additionally, its compliance with international safety standards ensures that it meets the rigorous audit requirements of nuclear and high-hazard facilities. Ultimately, the T9902 provides the essential layer of physical protection necessary to maintain the long-term operational confidence and safety of the DCS infrastructure.