Question:
Explain how to interpret relay durability curve data.
Answer:
The durability curve can provide the expected number of operations (expected life) based on the voltage and current of the load being opened and closed.
Explanation:
(Example 1):
In the durability curve of the resistive load of 250 VAC/30 VDC, when the load of 12 A is opened and closed, switching of 150,000 times can be expected.
Red vertical line:
Read the number of operations indicated by the red dashed line from the point ● where the red vertical line of 12 A and durability curve of 250 VAC/30 VDC resistive load intersect.
- Resistive load of 250 VAC/30 VDC: About 150,000 times each
(Example 2)
In the durability curve of the inductive load of 250 VAC/30 VDC, when the load of 3 A is opened and closed, switching of about 300,000 times can be expected.
Blue vertical line:
Read the number of operations indicated by the blue dashed line from the point ● where the blue vertical line of 1 A and durability curve of 250 VAC/30 VDC inductive load intersect.
- Inductive load of 250 VAC/30 VDC: About 300,000 times each
A vertical line is drawn based on the customer’s load current, and an indication of the number of operations that can be opened and closed can be read from the intersection with the durability curve.
Inductive load comes from data at AC cosφ = 0.4 and DC L/R = 7 ms.
Quick tips
The durability curve is for reference only and is not guaranteed.
Please make sure to comfirm it with your actual equipment before using it.
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Relays | Digi-Key Electronics
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