Uploaded October 2025 | Updated September 2026, 2 weeks ago
Speaker: Vamsi Connector | Duration ca. 34 min incl. Q&A
All resistors carrying current generate heat, a phenomenon known as the Joule effect. From a thermal perspective, a power connector can be accurately modeled as a simple resistor. The working current of a power connector is typically defined by industry standards, such as UL 1059 in our case, which specifies a maximum temperature rise (∆T) of 30 K (Kelvin is used for temperature difference, while Celsius is for absolute temperature). This implies that at its full working current, the connector's internal temperature will not exceed 30 K above the ambient temperature. The combined temperature rise and ambient temperature are further limited by the maximum operating temperature rating, ensuring connector durability when used with the proper de-rating curve (refer to ANE006 for more details on de-rating). However, certain applications, like the short acceleration phase of an electric scooter, the transition phase of an electric transformer, or capacitance discharge in a lighting ballast, demand a high current for only a brief duration.
This presentation will address a crucial question for designers:
- Do we have to oversize the connector working current to accommodate this inrush current, or is it permissible to temporarily exceed the specified working current for short periods?
- Detailed insights into the thermal behavior of connectors under dynamic, high-current pulses.
- Guidelines and recommendations for optimizing connector selection in applications with transient overload conditions.
#InrushCurrent
#PowerConnectors
#ThermalManagement
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Timestamps:
00:08 Introduction
00:50 Presentation
27:20 Questions and Answers
Speaker: Vamsi Connector | Duration ca. 34 min incl. Q&A
All resistors carrying current generate heat, a phenomenon known as the Joule effect. From a thermal perspective, a power connector can be accurately modeled as a simple resistor. The working current of a power connector is typically defined by industry standards, such as UL 1059 in our case, which specifies a maximum temperature rise (∆T) of 30 K (Kelvin is used for temperature difference, while Celsius is for absolute temperature). This implies that at its full working current, the connector's internal temperature will not exceed 30 K above the ambient temperature. The combined temperature rise and ambient temperature are further limited by the maximum operating temperature rating, ensuring connector durability when used with the proper de-rating curve (refer to ANE006 for more details on de-rating). However, certain applications, like the short acceleration phase of an electric scooter, the transition phase of an electric transformer, or capacitance discharge in a lighting ballast, demand a high current for only a brief duration.
This presentation will address a crucial question for designers:
- Do we have to oversize the connector working current to accommodate this inrush current, or is it permissible to temporarily exceed the specified working current for short periods?
- Detailed insights into the thermal behavior of connectors under dynamic, high-current pulses.
- Guidelines and recommendations for optimizing connector selection in applications with transient overload conditions.
#InrushCurrent
#PowerConnectors
#ThermalManagement
Follow Würth Elektronik on:
Facebook group: http://www.we-online.com/facebook-we-...
Facebook karriere: http://www.we-online.com/facebook-we-...
Instagram group: http://www.we-online.com/instagram/we...
Instagram karriere: http://www.we-online.com/instagram-we...
LinkedIn: we-online.com/linkedin
Twitter: we-online.com/twitter
TikTok: we-online.com/tiktok
XING: we-online.com/xing
YouTube: we-online.com/youtube
More details about Würth Elektronik eiSos: we-online.com/en
Timestamps:
00:08 Introduction
00:50 Presentation
27:20 Questions and Answers
