Product Overview

The ICS Triplex T9901 is a high-precision, 50 mA time-lag replacement fuse assembly specifically engineered to maintain the safety integrity of Trusted and AADvance controller architectures. These fuses serve as the primary overcurrent protection for the input stages of various analog and digital modules, including the T9801, T9802, T9803, and the T9831, T9832, and T9833 series. By providing a sacrificial barrier against electrical surges, the T9901 prevents transient faults from damaging expensive logic processors or field-side instrumentation.

Each T9901 kit is supplied as a pack of 20 individual fuses, ensuring that maintenance teams have an adequate supply for routine upkeep or emergency repairs. These fuses are essential for high-availability systems where the goal is to isolate localized electrical faults without necessitating a full system shutdown.

Key Technical Characteristics

The T9901 is manufactured to meet the rigorous standards of safety-instrumented systems (SIS), blending high-speed protection with industrial durability.

• Time-Lag Performance: Engineered with slow-blow (time-lag) characteristics, these fuses are designed to tolerate momentary inrush currents during system startup while providing rapid disconnection during sustained overcurrent events.

• Component-Level Compatibility: Optimized specifically for ICS Triplex I/O modules, ensuring precise mechanical fit and electrical impedance matching to maintain SIL-rated safety loops.

• Reliable Voltage Rating: Rated for up to 125 V, providing a wide safety margin for standard 24 Vdc and 48 Vdc industrial control circuits.

• Environmental Compliance: Features lead-free (RoHS compliant) construction, adhering to modern environmental safety standards for global industrial deployment.

• Standardized Safety: Manufactured in accordance with UL 248-14 standards by Littelfuse, ensuring consistent quality and predictable interruption ratings.

• Maintenance Efficiency: The easy-to-install design allows for rapid field replacement, significantly reducing the Mean Time to Repair (MTTR) for protected modules.

Technical Specifications

• Manufacturer: ICS Triplex (Rockwell Automation)

• Model Number: T9901

• Product Series: Trusted TMR / AADvance System

• Module Type: Replacement Input Fuse (Pack of 20)

• Current Rating: 50 mA

• Fuse Characteristic: Time-Lag / Slow-Blow

• Voltage Rating: 125 V

• Compliance: UL 248-14, Lead-Free

• Weight: 1.26 kg (Packaged shipping weight)

• Dimentions: 3x30.2x26.5cm

• HS CODE: 8537101190

• Origin: USA

Application and System Maintenance

In complex Safety Instrumented Systems (SIS), the T9901 is a critical consumable. It is primarily used in the energy, offshore oil, and chemical processing sectors where the Trusted TMR system provides emergency shutdown (ESD) and fire and gas (F&G) protection.

The use of genuine T9901 fuses is vital for maintaining the manufacturer's warranty and the system's overall safety certification. Using non-compliant third-party fuses can result in nuisance trips or, conversely, a failure to protect the input circuitry during a significant surge. By keeping T9901 packs in stock, plant operators can ensure that their control systems remain resilient against electrical disturbances and that downtime is kept to an absolute minimum.