Maximum Temperature of Busbar Connector
The maximum temperature of busbar connectors depends on the material and standard, typically 85°C for copper and a 55 K temperature rise for aluminium joints per IEC 61439.
Temperature Limits for Copper Busbars
For copper busbars, continuous operation is generally limited to a maximum temperature of 85°C to ensure safe operation and thermal reserve, considering the lowest permissible temperature of components in contact with the busbar, such as fuse bases or outgoing cables (DIN 43 671) . IEC 61439-1 recommends a temperature rise of up to 65 K above 35°C ambient for bare copper busbars, which corresponds to a maximum busbar temperature of approximately 100°C under normal operating conditions . During short-circuit events, copper busbars can withstand temperatures up to 250°C for brief periods, as specified in IEC 61439-1 .
Temperature Limits for Aluminium Busbars
For aluminium busbars, IEC 61439-1 (Edition 3, 2020) specifies a maximum temperature rise of 55 K for bare aluminium-to-aluminium joints to ensure long-term safety and performance . This limit is critical because aluminium has a higher resistivity and lower melting point than copper, making thermal management essential.
Factors Affecting Maximum Temperature
- Ambient temperature: Busbar systems are typically rated for an ambient of 35–40°C; higher ambient temperatures reduce the allowable current to maintain safe busbar temperatures .
- Insulation and components: The maximum temperature is also limited by the insulation type of cables or supporting materials (PVC, XLPE, or porcelain) .
- Cooling and enclosure: Enclosures with higher IP ratings (IP54 and above) improve heat dissipation, allowing slightly higher continuous currents without exceeding temperature limits .
- Short-circuit conditions: Thermal withstand during short-circuit events must be verified using adiabatic calculations to ensure the busbar does not exceed material limits .
Practical Guidelines
- For copper busbars, maintain a maximum continuous temperature of 85°C, with a typical design temperature rise of 65 K above ambient.
- For aluminium busbars, ensure the temperature rise does not exceed 55 K at aluminium-to-aluminium joints.
- Always consider the lowest-rated component in contact with the busbar to determine the safe operating temperature.
- Use busbar sizing calculators or IEC 61439-1 guidelines to verify that the cross-sectional area and current density maintain temperatures within safe limits . By adhering to these limits, busbar connectors can operate safely, maintain performance, and comply with international standards.
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