These are Phoenix relays with cracks, and they operate on a 150-millisecond operating system. Is there an explanation for these cracks?
• Check the load voltage, it must fit the relay
• Cracks could happen due to heat
• Maybe the relay is not well dimensioned to the load and the frequency of the use. There are temporary solutions like putting another bigger relay under or more permanent changing the relay to a bigger one or combining it with a contactor depending on the load.
• It could also be because of overheating so check the ventilation and operational temperature.