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        T9901

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        1001 reviews ｜ Need a Specific Revision?
        The ICS Triplex T9901 is a genuine Rockwell Automation replacement fuse kit designed specifically for AADvance series input termination assemblies, providing 50mA time-lag overcurrent protection for critical safety I/O channels.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for T9901

        • Manufacturer:
          ICS Triplex
        • Part Number:
          T9901
        • Product Family:
          AADvance Controller
        • Product Type:
          Replacement Input Fuse Kit
        • Current Rating:
          50 mA
        • Voltage Rating:
          125 V
        • Package Quantity:
          20 fuses per kit
        • Material:
          Lead-free, glass tube
        • Operating Temperature:
          -25°C to +70°C
        • Storage Temperature:
          -40°C to +85°C
        • Safety Certification:
          UL 248-14, suitable for SIL 3 systems
        • Weight:
          0.1 kg
        • Estimated shipping dimensions:
          8537101190
        • Tariff Code:
          8537101190
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Safety & Compliance Certifications & Standards Applications

        Features:

        • Precision 50mA Time-Lag Protection
        • Genuine OEM Component for AADvance Safety Systems
        • Bulk Kit for Maintenance Efficiency
        The ICS Triplex T9901 is engineered with a 50mA time-lag characteristic to protect sensitive analog and digital input channels. Unlike fast-acting fuses, the time-lag design allows brief inrush currents from field sensors (e.g., pressure transmitters or proximity switches) to pass without interruption, while still clearing persistent overcurrent faults to prevent damage to the AADvance I/O module.

        As a Rockwell Automation original spare part, the ICS Triplex T9901 guarantees form-fit-function compatibility with AADvance termination assemblies T9801/2/3 and T9831/2/3. Using certified replacement fuses ensures that the Safety Instrumented Function (SIF) maintains its SIL 2/SIL 3 rating and that internal channel diagnostics (e.g., open-circuit and short-circuit detection) operate within their specified safety accuracy limits.

        Each ICS Triplex T9901 kit contains 20 fuses, allowing plant maintenance teams to stock a single part number for multiple I/O termination types. This reduces inventory complexity and ensures immediate availability during corrective maintenance, minimizing system downtime. The fuses are field-replaceable without soldering, using standard fuse holders on the termination assembly.

        The T9901 ICS Triplex Replacement Input Fuse Kit may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        ICS Triplex T9901 Replacement Input Fuse Kit Manuals,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.
        ICS Triplex T9901 Replacement Input Fuse Kit

        General

        • Manufacturer ICS Triplex
        • Model T9901
        • Condition New Original ready stock
        • Product Family T9100,T9110,T9191
        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.
        • IEC 61508 SIL 3 Capable – When installed in an AADvance controller configured for SIL 3, the ICS Triplex T9901 does not degrade the safety integrity. Its failure modes (open-circuit, short-circuit) are fully covered by the module’s internal diagnostics, as required by IEC 61508-2.
        • IEC 61511 for Process Safety – The fuse complies with the “proven-in-use” requirements of IEC 61511 for process industry safety instrumented functions. Field replacement procedures are documented in the AADvance Troubleshooting Manual (ICSTT-RM406).
        • Low-Failure Rate Component – As a passive component, the ICS Triplex T9901 has an extremely low random hardware failure probability, contributing negligibly to the overall PFDavg (Probability of Failure on Demand) calculation for the safety loop.
        • Hazardous Location Suitability – The fuse is certified for installation in ATEX Zone 2, IECEx Zone 2, and NEC Class I Division 2 environments, provided it is housed within the required IP54 enclosure and replaced only under proper work permit conditions.
        • UL 248-14 – Recognized component certification for low-voltage fuses, verifying the ICS Triplex T9901 meets North American safety standards for overcurrent protection up to 125V.
        • RoHS 2011/65/EU – Lead-free and compliant with the Restriction of Hazardous Substances directive, allowing the ICS Triplex T9901 to be sold and used in European Union markets.
        • ATEX & IECEx (System Level) – While not an individually marked Ex component, the ICS Triplex T9901 is listed as a spare part in the AADvance system certificate (DEMKO 11 ATEX 1129711X / IECEx UL 12.0032X) for use in Zone 2 gas hazardous areas.
        • TÜV Rheinland Functional Safety – The AADvance platform, including the use of ICS Triplex T9901 in termination assemblies, is TÜV-certified for IEC 61508 SIL 2 and SIL 3 applications, as documented in the AADvance Release 2.011 certification.
        • Emergency Shutdown Systems (ESD) – The ICS Triplex T9901 protects input channels reading critical process transmitters (pressure, temperature, flow) in oil & gas platforms and refineries, ensuring that a single field loop fault does not compromise the entire safety function.
        • Fire & Gas (F&G) Detection Systems – Used in AADvance-based F&G panels, the 50mA fuse safeguards combustible gas detectors, flame scanners, and manual call points, maintaining SIL 3 integrity even in harsh indoor/outdoor environments.
        • Burner Management Systems (BMS) – In boiler and furnace control, the ICS Triplex T9901 provides overcurrent protection for flame relay inputs and limit switch circuits, helping prevent nuisance shutdowns caused by transient inrush currents during burner light-off.
        • High-Availability Process Control – For critical processes requiring 1oo2D or 2oo3D redundancy, each redundant leg’s input channel uses its own ICS Triplex T9901. If one fuse blows, the other redundant channel(s) continue operation while maintenance replaces the fuse online (in hot-swappable dual/TMR configurations).
        Description
        The ICS Triplex T9901 fuse kit is an essential service component for maintaining the operational integrity of AADvance safety controllers in SIL 2 and SIL 3 applications. Engineered by ICS Triplex (a brand of Rockwell Automation), this kit contains 20 pieces of Littlefuse 396/TE5 time-lag fuses, specifically rated at 50mA and 125V DC. It is manufactured to meet UL 248-14 standards, ensuring reliable protection for field input loops against overcurrent and short-circuit conditions.

        Designed for field replacement, the ICS Triplex T9901 directly supports simplex, dual, and TMR (Triple Modular Redundant) I/O configurations. It is compatible with digital input termination assemblies (T9801, T9802, T9803) and analog input termination assemblies (T9831, T9832, T9833). By using this original fuse kit, plant operators can prevent nuisance channel faults and maintain the safety accuracy of their AADvance system without degrading performance.

        Unlike standard commercial fuses, the ICS Triplex T9901 is validated for hazardous and non-hazardous environments, operating reliably across a temperature range of -25°C to +70°C. Its time-lag characteristic is critical for avoiding false trips caused by inrush currents from field sensors, making it the only recommended replacement part for AADvance input modules in emergency shutdown (ESD) and fire & gas (F&G) systems.
        Alternative Names
        T99O1 T990I T9902 T9100 T9110 T9191 T9193 T9300
        Technical notes
        ICS Triplex T9901 must be used exclusively with AADvance termination assemblies T9801/2/3 and T9831/2/3; substituting with non-specified fuses may void SIL 3 certification and compromise channel diagnostics.When replacing the ICS Triplex T9901, always power down the associated field circuit (or ensure the area is non-hazardous for Class I Div 2 locations), and torque terminal screws to 0.5 Nm to maintain proper contact resistance.The ICS Triplex T9901 is a time-lag (slow-blow) fuse—different from fast-acting types—specifically chosen to tolerate momentary overcurrents from inductive field devices without nuisance clearing.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        How do I correctly replace a blown ICS Triplex T9901 fuse?
        To replace the ICS Triplex T9901: 1) Isolate the field loop power supply (or de-energize the entire controller if in a simplex non-redundant configuration). 2) Open the clear fuse cover on the termination assembly. 3) Use the T9908 fuse extractor tool or fine-tip pliers to remove the old fuse. 4) Insert a new T9901 fuse (no orientation required). 5) Close the cover and re-apply power. 6) Press the Fault Reset button on the T9110 processor module to clear the latched channel fault.
        What are the temperature and hazardous location limitations for the ICS Triplex T9901?
        The ICS Triplex T9901 inherits the AADvance controller’s environmental rating: -25°C to +70°C operating ambient. For hazardous locations (Class I, Division 2, Groups A, B, C, D or ATEX Zone 2), the fuse can be replaced only in an area known to be free of ignitable concentrations, or with the circuit de-energized. The fuse itself is non-incendive and requires an IP54 tool-accessible enclosure per the AADvance installation manual.
        Which AADvance termination assemblies are compatible with the ICS Triplex T9901?
        The ICS Triplex T9901 is compatible with digital input TAs (T9801 simplex, T9802 dual, T9803 TMR) and analog input TAs (T9831 simplex, T9832 dual, T9833 TMR). It is not used for output termination assemblies (T9851/52/92 or T9881/82), which require the T9902 10A output fuse instead.
        Does the ICS Triplex T9901 support HART protocol pass-through on analog inputs?
        Yes. The ICS Triplex T9901 is installed in the field loop path before the AADvance analog input module (T9431/T9432). Because the 50mA rating and time-lag characteristic do not attenuate or filter the HART frequency shift keying (FSK) signal, HART communications pass through transparently when used with the T983x termination assembly and AADvance DTM software.
        What is the exact fuse specification of the ICS Triplex T9901, and can I use a 50mA fast-acting fuse instead?
        The ICS Triplex T9901 is a Littlefuse No 396/TE5, 50mA, 125V, time-lag (slo-blo) fuse. A fast-acting fuse is not a direct substitute because it may nuisance-trip during normal inrush currents from field devices (e.g., capacitive sensors or long cable runs), causing false channel faults and potentially tripping the safety function. Always use the specified time-lag type.

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