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Among the European residual current standards this one governs the combined device, and the distinction from the standard for the device without overcurrent protection is not merely administrative. A combined device must satisfy the requirements of two protective functions at once, and the standard has to define the interaction between them: the overcurrent release must clear an overload or a short circuit, the residual current element must operate on an earth fault, and the standard must also cover the case in which both occur simultaneously, which is precisely the situation that reveals a design weakness. In European practice the device is installed in consumer units to protect an individual final circuit, and the assessment is carried out alongside the standard covering the electromagnetic compatibility of residual current devices, since nuisance tripping is treated as a safety issue rather than merely an inconvenience. Certification of the device is accepted across the member states through the recognised bodies.

EN 61009-1 standard satisfiable test: Multifunction Immunity Tester 。
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Inquiry function description

 •  Using the product inquiry function can help you quickly learn about the product's price and other related information.

 •  You can either inquire about a single product directly, or select multiple products to add to the inquiry bar and inquire about them together.

 •  How to make an inquiry

1. How to add a product to the inquiry bar
1) Select from any product list
2) Select from any product detail page
2. How to access the inquiry bar
1) Click the floating "Inquiry" button on the right side of any page
2) Then fill in your information on the inquiry page
3. How to inquire directly
1) Go to any product detail page, click "Inquiry Now", and then leave your information in the pop‑up window
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Comparison Function Description

1.  Using the product comparison function can help you find the target product you need for selection more quickly and easily.

2.  You can add up to 5 products for comparison. Product models and parameters may vary across different series. It is recommended to compare products within the same series.

3.  How to use the comparison bar.

1. How to add a product to the comparison bar.
1) Select from any product list
2) Select from any product detail page
2. How to perform a comparison.
1) Click the floating "Compare" button on the right side of any page.
2) After confirming the products you have selected for comparison, click "Start Comparison" to view the comparison results.
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