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Application Notes

Technical guidance on high voltage DC switching, contactor performance, and engineering best practices.

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REC15 Coil Parameters Over Temperature
AN0015
REC15 Coil Parameters Over Temperature
How REC15 pickup, dropout, and actuation behavior shift with temperature, and what that means for low-voltage supplies.
Optimizing HV Contactor Coil Suppression
AN0014
Optimizing HV Contactor Coil Suppression
Why aggressive coil clamping protects driver electronics but slows contact separation and shortens HV contact life.
Continuous Current Carry Ratings
AN0013
Continuous Current Carry Ratings
What sets the continuous current carry rating, and how installation conditions change it for the same contactor.
Contact Resistance
AN0012
Contact Resistance
Why contact resistance is dynamic, what asperities and a-spots are, and how to measure resistance correctly.
Epoxy vs Ceramic DC Contactors
AN0011
Epoxy vs Ceramic DC Contactors
How epoxy and ceramic seals shape contact resistance, arc behavior, thermal limits, and contactor lifecycle.
Using a Manual Switch to Open a Load
AN0010
Using a Manual Switch to Open a Load
Why manual disconnects are for isolation only, and what happens when you try to open one under load.
Understanding MTBF and FIT Rates
AN0009
Understanding MTBF and FIT Rates
MTBF, FIT rate, and bathtub curve basics for predicting contactor service life and total cost of ownership.
REC35 Series Auxiliary Contact Details
AN0007
REC35 Series Auxiliary Contact Details
How the REC35 auxiliary microswitch links to the main contacts to give BMS and PLC reliable position feedback.
Switching Cycle Performance
AN0006
Switching Cycle Performance
What actually drives contact wear: inrush current, power factor, and the loads that shorten cycle life.
Welded Contacts in Contactor Systems
AN0005
Welded Contacts in Contactor Systems
Why welded contacts happen during closure, the role of capacitive inrush, and how to precharge to prevent it.
Polarized vs Bidirectional Switching
AN0004
Polarized vs Bidirectional Switching
How magnetic arc blow-out orientation determines whether a contactor breaks current in one direction or both.
Power Terminal Connection Guidelines
AN0002
Power Terminal Connection Guidelines
Why rigid busbars crack hermetic seals, and the right way to torque and connect flexible busbars to power terminals.
External Economizer Design Guidelines
AN0001
External Economizer Design Guidelines
Why external PWM coil drivers are used instead of internal economizers, and how to design one for REC35 contactors.
Capacitive Load Precharge
Specifications & Testing
Coil Transient Suppression
Thermal & Current Rating
Contact Resistance
Sealing Technology
Safety & Isolation
Auxiliary Contacts & Feedback
Reliability & Lifecycle
Failure Modes & Diagnostics
Switching & Arc Control
Installation & Mechanical
Coil Drive & Economizers
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