The heat tends to destroy them, but they usually discolour first then go open circuit.
A short circuit can often destroy them but most I have known then weld the contacts in the on position.
The red flag indicater is usually unreliable and faded after prolonged use.
But on the new one should be visible if the coil is energised.
Merlin gerin use a long part number stamped on the front,Do you know that number.
A short circuit can often destroy them but most I have known then weld the contacts in the on position.
The red flag indicater is usually unreliable and faded after prolonged use.
But on the new one should be visible if the coil is energised.
Merlin gerin use a long part number stamped on the front,Do you know that number.