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Case SealingOpenRelay without a protective case. Dustproof Relay with a case to protect against dust penetration. Degree of protection Ratings for example defined in IEC 60 529, indicating how completely a cover, seal, etc. protects against water, humidity, dust, direct contact, ect. Relay protection classes (according to IEC 60 529) Class IP 54: Non sealed relays which are protected against flux by their base plate and cover (dustproof). Class IP 67: describes sealed (immersion cleanable) relays. Relay suitable for processing on soldering lines Relays for solder bath insertion where suitable sealing of the relay on the printed circuit board side prevents any flux entering the case. Sealed Relay Relays which are sealed against the penetration of specified PCB cleaners or lacquers. Immersion cleanable Relays that can be cleaned, lacquered or cast-in together with the printed circuit board after soldering without anything penetrating the relay. The washing requires a suitable solvent. In ultrasonic washing processes, the limiting values for temperature, duration and frequency must be observed. Note: Relays sealed against washing can also be used for environments with aggressive Hermetically sealed Relays with the highest degree of sealing (particularly relays with metal cases and glass insulators). Source: IEC 1810-7 and EN 116000-3, modified |