There are many features in our Parametric Filter for choosing a relay for your application. Below I have listed many of the options just to help provide a short description of what these are.
An LED signifies that the coil is being energized.
Like the led indicator this position change will indicate coil is activated
Another option would be to test if the relays wired properly without energizing the coil.
Like a diode, an internal resistor across the coil is used to help protect sensitive equipment from any voltage spikes. However, resistors will let current through so a high ohm value is selected to help reduce current flow. These are not as efficient as a diode but can be more durable than a diode.
Diode, Surge Protection, Varistor and RC Circuit
Various methods of surge suppression. Please see post:
“built-in debounce feature that prevents
the relay from changing state if the switch or float contact
When the switching contact opens with DC loads an arc can be generated and only turned off when the contact distance is far enough away. Magnetic blowout is a feature that uses magnets to direct arcing away from the contacts.
Reverse Coil Polarity
When board designs require, this feature just swaps the plus and minus on the coil.