What is BS EN 61810‑2‒ Reliability of electromechanical relays about?
BS EN 61810‑2 is the second part of an international product standard that focuses on electromechanical elementary relays.
BS EN 61810‑2 covers test conditions and provisions for the evaluation of endurance tests using appropriate statistical methods to obtain reliability characteristics for relays. It applies to electromechanical elementary relays considered as non-repaired items i.e., items that are not repaired after a failure.
BS EN 61810‑2 specifies the failure criteria and the resulting characteristics of elementary relays describing their reliability in normal use. It also provides numerical and graphical methods to calculate approximate values for the two-parameter Weibull distribution, as well as lower confidence limits and a method for confirmation of reliability values with the WeiBayes method.
Note 1: BS EN 61810‑2 does not cover procedures for electromechanical elementary relays where enhanced requirements for the verification of reliability apply.
Who is BS EN 61810‑2‒ Reliability of electromechanical relays for?
BS EN 61810‑2 on Reliability of electromechanical relays is useful for:
- Manufactures of electromechanical elementary relays
- Suppliers, dealers, and importers of electromechanical elementary relays
- Installers and service providers for electromechanical elementary relays
- Test houses for relays
Why should you use BS EN 61810‑2‒ Reliability of electromechanical relays?
The life of relays as non-repairable items is primarily determined by the number of operations. For this reason, the reliability is expressed in terms of mean cycles to failure (MCTF).
BS EN 61810‑2 discusses the elementary electromechanical relays and gives you requirements and tests procedures for the assessment of the reliability of electromechanical relays. It contains both numerical and graphical methods for the evaluation of Weibull-distributed data as well as WeiBayes estimation.
BS EN 61810‑2 comprises test conditions and an evaluation method to obtain characteristic reliability values for electromechanical elementary relays. The equipment reliability is calculated from mean time to failure (MTTF) figures. The users can calculate an effective MTTF value for the relay in a particular application, with the knowledge of the frequency of operation (cycling rate) of the relay within a piece of equipment.
What’s changed since the last update?
BS EN 61810‑2:2017 supersedes BS EN 61810‑2:2011, which is withdrawn. This edition includes the following significant technical changes with respect to the previous edition:
- Addition of graphical and numerical methods, reduction of the number of samples in specified cases, new subclauses of confidence intervals are added
- The WeiBayes approach is added to facilitate compliance tests (routine test) with lower effort annexes have been restructured into an Annex A for data analysis (normative) and Annex B (informative) where various examples of the data analysis are given
- The former Annex C has been incorporated into the modified Annex B, a new Annex C replaces the old Annex D