Explain how to interpret relay durability curve data.

(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.

The durability curve is for reference only and is not guaranteed.
Please make sure to comfirm it with your actual equipment before using it.

We have prepared a technical support page dedicated to high-capacity relays that explains in detail "I don't know" when using high-current, high-voltage PCB power relays, such as back EMF voltage (Zener diode and varistor) of the coil, holding voltage application circuit, recommended conditions for high-current substrate flow solder, the influence of magnetic fields, and precautions when connecting in series and parallel. Please also use this as well.
Click here for the high-capacity power relay technical support page.