Information

Application Notes

Technical guidance on high voltage DC switching, contactor performance and engineering best practices, written by Rincon Power engineers.

AN0022Partially Welded ContactsWhat a partial weld is, resulting auxiliary status, and how to detect and clear the fault.
AN0021REC15 and REC45 Construction for Bi-Directional SwitchingHow REC15 and REC45 construction and end-mounted blowout magnets deliver equal arc interruption in both current directions.
AN0020Contactor and Fuse Coordination in High-Voltage EV ApplicationsHow to coordinate contactors with HV fuses using time-current curves so neither ruptures during a short circuit.
AN0017RXC60 Coil Parameters Over TemperatureHow RXC60 dual-coil pickup, dropout, and coil current shift with temperature, and what it means for low-voltage supplies.
AN0016RXC35 Coil Parameters Over TemperatureHow RXC35 dual-coil pickup, dropout, and coil current shift with temperature, and what it means for low-voltage supplies.
AN0015REC15 Coil Parameters Over TemperatureHow REC15 pickup, dropout, and actuation behavior shift with temperature, and what that means for low-voltage supplies.
AN0014Optimizing HV Contactor Coil SuppressionWhy aggressive coil clamping protects driver electronics but slows contact separation and shortens HV contact life.
AN0013Continuous Current Carry RatingsWhat sets the continuous current carry rating, and how installation conditions change it for the same contactor.
AN0012Contact ResistanceWhy contact resistance is dynamic, what asperities and a-spots are, and how to measure resistance correctly.
AN0011Epoxy vs Ceramic DC ContactorsHow epoxy and ceramic seals shape contact resistance, arc behavior, thermal limits, and contactor lifecycle.
AN0010Using a Manual Switch to Open a LoadWhy manual disconnects are for isolation only, and what happens when you try to open one under load.
AN0009Understanding MTBF and FIT RatesMTBF, FIT rate, and bathtub curve basics for predicting contactor service life and total cost of ownership.
AN0007REC35 Series Auxiliary Contact DetailsHow the REC35 auxiliary microswitch links to the main contacts to give BMS and PLC reliable position feedback.
AN0006Switching Cycle PerformanceWhat actually drives contact wear: inrush current, power factor, and the loads that shorten cycle life.
AN0005Welded Contacts in Contactor SystemsWhy welded contacts happen during closure, the role of capacitive inrush, and how to precharge to prevent it.
AN0004Polarized vs Bidirectional SwitchingHow magnetic arc blow-out orientation determines whether a contactor breaks current in one direction or both.
AN0002Power Terminal Connection GuidelinesWhy rigid busbars crack hermetic seals, and the right way to torque and connect flexible busbars to power terminals.
AN0001External Economizer Design GuidelinesWhy external PWM coil drivers are used instead of internal economizers, and how to design one for REC35 contactors.

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Auxiliary Contacts & Feedback

Capacitive Load Precharge

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Coil Transient Suppression

Contact Resistance

Failure Modes & Diagnostics

Installation & Mechanical

Reliability & Lifecycle

Safety & Isolation

Sealing Technology

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Switching & Arc Control

Thermal & Current Rating