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100-FSD250 A-B Motor Protection Circuit Breaker
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- Description 100-FSD250 A-B Motor Protection Circuit Breaker Product Dimensions： Allen-Bradley Product Details: Diode Surge Suppressor (100-FSD250) The 100-FSD250 (often referred to in the series as 100-FSD25) is a high-quality diode surge suppressor module from Rockwell Automation’s Allen-Bradley brand. It is a critical accessory for IEC contactors and control relays, designed to protect sensitive electronic control circuits from the damaging effects of inductive voltage spikes. Product Description (Detailed Explanation) The 100-FSD250 is a plug-in diode module specifically engineered for use with DC-operated coils. When a contactor coil is de-energized, the collapsing magnetic field creates a high-voltage transient (back-EMF). This module uses a diode to “clamp” that voltage, providing a path for the energy to dissipate safely. It is designed to mount directly onto the front or side of Bulletin 100-C contactors or 700-CF control relays, requiring no additional wiring and ensuring a clean, compact installation within the control panel. Product Parameters (Technical Specifications) Parameter Category Specification Product Type Surge Suppressor (Diode Module) Part Number 100-FSD250 Coil Voltage Range 12V to 250V DC Suppression Method Diode (Uni-directional) Compatibility MCS 100-C, 104-C Contactors; 700-CF, 700S-CF Relays Mounting Type Front Mount (Tool-less plug-in) Terminal Type Integrated Connection Pins Standards IEC/EN 60947-1, UL 508, CSA, CE Marked Operating Temp. $-25^{\circ}C$ to $ 60^{\circ}C$ Product Advantages (Key Benefits) Superior Circuit Protection: Effectively limits the transient voltage to the forward voltage drop of the diode (approx. 0.7V – 1V), protecting PLC outputs and delicate electronic switches. Easy Installation: The module snaps directly into the contactor housing, establishing an electrical connection with the coil terminals automatically. Space-Saving Design: Its low-profile architecture does not interfere with the mounting of auxiliary contact blocks or other accessories. Cost-Effective Maintenance: By preventing the premature failure of semiconductor outputs in the control system, it significantly reduces downtime and replacement costs. No Interference: Does not affect the pick-up time of the contactor, ensuring consistent performance. Precautions (Important Notes) DC Only: This diode module is strictly for DC coils. Using it on an AC coil will result in a short circuit and immediate destruction of the module and potentially the control circuit. Polarity Sensitive: Diodes are directional. Ensure the coil polarity ($A1 /A2-$) matches the requirements of the module to ensure proper suppression. Drop-out Delay: Using a diode suppressor will significantly increase the drop-out time of the contactor (the time it takes for the contacts to open) because the stored energy circulates through the diode. For high-speed applications, consider an RC or Varistor module instead. Voltage Match: Verify that the DC supply voltage falls within the 12-250V range to ensure the diode components are not overstressed. Product Applications (Typical Use Cases) PLC-Controlled Systems: Essential when a PLC or DCS digital output card is directly driving a contactor coil without an interposing relay. Telecommunications Power: Protecting sensitive communication hardware from electrical noise generated by switching heavy DC loads. Material Handling: Used in conveyor systems and automated sorting where frequent switching of DC-controlled motors and actuators occurs. Battery-Backed Systems: Ideal for solar, marine, or backup power systems utilizing 24V, 48V, or 110V DC control voltage. Safety Circuits: Protecting safety relays and controllers from back-EMF interference in industrial guarding applications. 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