An isolator switch is a critical safety component in any EV charging system, allowing for safe disconnection and maintenance. However, when installing a 32A EV charger, many ask:
• What rating should the isolator switch be?
• Does quality affect safety and performance?
At Innovative Green Power (IGP), safety is our top priority, which is why we use the Hager JG340U (40A) isolator switch as our standard. Here’s why this choice is essential.
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32A, 35A, 40A Ratings – Which One Should You Use?
1. Why a Buffer is Necessary
• A 32A EV charger draws 32A continuously, requiring an isolator switch that can handle this load reliably.
• In Malaysia, TNB’s power factor has been consistently greater than 0.9, meaning that a 10% buffer is the minimum recommended for continuous loads like EV charging.
2. Common Isolator Ratings & Their Suitability
**Please see diagram in the pictures section**
Verdict: IGP exclusively uses 40A isolators to provide a reliable safety margin for long-term performance.
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Does Quality Play a Role in Isolator Switch Selection?
Yes! The quality of the isolator switch directly impacts safety, durability, and long-term reliability. Poor-quality isolators can cause:
Overheating – Low-quality materials cause excessive heat buildup.
Voltage drops – Poor internal contacts increase resistance, leading to inefficiencies.
Frequent failures – Inferior components degrade quickly under continuous load.
Why IGP Uses Hager JG340U (40A) as Standard
Tested for high endurance – Ensures long-term performance under continuous load.
Premium-grade copper contacts – Reduces heat loss and ensures strong conductivity.
Flame-retardant casing – Provides added safety in case of electrical faults.
IEC & MS certified – Meets international and Malaysian safety standards.
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Final Recommendation
• For a 32A EV charger, a 40A isolator is essential for safety and durability.
• IGP exclusively uses the Hager JG340U (40A) isolator, ensuring safe, efficient, and long-lasting EV charging installations.
