Overview
Manuals
Arc Flash Hazard
Hardware Compatibility (AADvance and 1715 RIO)
Features:
- Replacement input fuse 50 mA for T9801/2/3 and T9831/2/3, pack of 20
- Its core component is the 396/TE5 series ultra-miniature time-delay fuse (50mA time-delay fuse) manufactured by Littelfuse, a globally renowned circuit protection manufacturer
- The rated operating voltage is 125V, which fully complies with the UL 248-14 safety specification for low-voltage fuses, and it is a lead-free and environmentally friendly component
The T9901 is also a high-quality replacement part for Rockwell Automation's ICS Triplex brand AADvance safety control system. Officially defined, it is a standard 2A fast-blow input fuse kit. This kit is typically supplied in sets of 20 and is designed specifically for analog/digital input field terminals (FTAs) (such as the T9811 and T9812) in AADvance systems. As the first line of defense for system inputs, its primary function is to provide high-speed current overload and short-circuit protection for the input circuits of field transmitters and switches, effectively isolating field electrical faults from the signal acquisition modules.
Furthermore, this component plays an irreplaceable role in maintaining high availability and explosion-proof safety in industrial environments. Since Safety Instrumented Systems (SIS) typically need to read sensor data directly from high-risk areas such as hazardous chemical zones and long pipelines, grounding short circuits in field wiring can easily cause fault currents of up to tens of amperes to surge into the central control cabinet. The T9901 employs a manufacturer-certified fast-blow design (with ultra-low fusing energy), enabling it to self-sacrifice and disconnect faulty circuits extremely quickly before causing permanent physical damage to active modules.
The T9901 ICS triplex Input Fuse Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
ICS Triplex T9901 Input Fuse Module manual(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Because AADvance is typically deployed in hazardous areas as a highest safety level (SIL3) emergency stop (ESD) or fire and gas protection (F&G) system, Rockwell's official maintenance manual provides extremely stringent safety warnings regarding the replacement of the T9901:
Power Disconnection: When performing maintenance in explosion-proof or high-risk areas (e.g., Class I Zone 2 or Zone 2), always ensure that the circuit is completely disconnected before removing and replacing the T9901 fuse.
Explosion Hazard Isolation: If the T9901 is forcibly inserted or removed while the external circuit is still energized, its tiny needle-like contacts can easily generate a small electric arc within the slot. This can easily cause a localized explosion or personal injury in environments with high local gas concentrations (e.g., chemical plants or oil platforms).
Within Rockwell Automation's hardware ecosystem, the T9901 offers exceptional versatility, serving two main product lines:
1.AADvance Safety Control System: Designed to protect each channel of the T9801, T9802, T9803 (Analog Input Terminal Units, TAs) and T9831, T9832, T9833 (Digital Input Terminal Units, TAs).
2.A-B SIMATIC 1715 Redundant I/O System: The T9901 also serves as a standard channel-level surge and overcurrent protection barrier for the 1715 Series Distributed Redundant Input Base.
3.Protected Objects: Its core function is to protect the upper-level T9100 and T9300 main processor bases and the T9400 Series Smart Input Cards from secondary electrical hazards caused by external channel overloads and high-voltage wiring errors.
