ID： FAQE10032E
update:
Answer
The P level (reference value) indicates that a failure is expected to occur once in every 10 million cycles in the event of a microload as specified in JIS C 5003.
Explanation
Contact resistance may be a problem when opening and closing microloads.
If a high contact resistance value is accidentally generated, it may be recovered by the subsequent operation.
In addition, contact resistance may increase due to generation of contact coating.
Whether or not the contact resistance value is considered a failure depends on whether or not a problem occurs in the circuit. For this reason, the failure criteria for the contact resistance of relays are specified only in the initial value, and the failure rate is expressed using the P level (reference value) as a guideline for the minimum applied load.
The failure rate is the rate at which a failure occurs within a unit time (number of operations) when the relay is opened and closed continuously at the specified test type and load.
This value can vary depending on the frequency of opening and closing, the environment, and the level of reliability you expect. Be sure to test the actual equipment under actual operating conditions.
Quick tips
When using at a microload level, the reliability may vary depending on the contact material and contact method. Consider signal (communication) relays that emphasize contact reliability.
| Product category | Relays Signal Relays Power Relays |
|---|---|
| Classification | Usage, Applications |
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ID: FAQE10032E, Update: October 1st, 2021
The article discusses the concept of the "P level" as a reference value in relay systems, particularly in the context of microloads as specified in JIS C 5003.
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P Level (Reference Value): The P level is a critical parameter used in assessing the reliability of relays. In this context, it indicates that a failure is expected to occur once in every 10 million cycles in the event of a microload. This metric serves as a guideline for the minimum applied load and is a fundamental aspect of relay testing and specification.
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Contact Resistance and Its Impact: Contact resistance is identified as a potential issue when dealing with microloads. The article suggests that high contact resistance values may be generated during the opening and closing of microloads. Fortunately, in some cases, the contact resistance can be recovered through subsequent operations. The possibility of increased contact resistance due to the generation of contact coating is also highlighted. The determination of whether the contact resistance value constitutes a failure depends on whether a problem occurs in the circuit.
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Failure Criteria and Rate: The failure criteria for contact resistance are specified only in the initial value, emphasizing the importance of assessing the relay's performance under specified conditions. The failure rate is defined as the rate at which a failure occurs within a unit time (number of operations) when the relay is continuously opened and closed under specific test conditions and loads. It is expressed using the P level as a reference value.
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Variability in Reliability: The article underscores that the failure rate can vary based on factors such as the frequency of opening and closing, environmental conditions, and the expected level of reliability. Practical testing under actual operating conditions is emphasized to ensure accurate assessments.
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Quick Tips for Microload Level: In microload applications, the reliability of relays can vary depending on the contact material and contact method. The article suggests considering signal (communication) relays that emphasize contact reliability in such scenarios.
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Product Categories and Classification: The article provides information on two main categories of relays - Signal Relays and Power Relays. These are further classified based on their usage and applications, reflecting the diversity of relay systems in different electrical setups.
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Conclusion and Reminder: The article concludes by reminding readers that when dealing with microloads, it's crucial to test the actual equipment under real operating conditions to ensure reliability and performance.
In summary, this article provides a comprehensive overview of key concepts related to relay systems, including the P level, contact resistance, failure criteria, and the importance of practical testing in specific operating conditions. This information is essential for anyone involved in the selection, deployment, and maintenance of relay systems, particularly in microload applications.
