Relays are generally rated for switching resistive loads.

Depending on the type of relay, contact ratings represent resistive loads only, since actual load conditions (values of power, voltage, current, etc.) may affect the durability of the relay.

Inrush current must be guaranteed within the maximum rated contact current. However, under load conditions with high inrush current and low break current, contact transfer (for DC applications) or locking phenomena can occur, so the relays must be properly tested on the real load and on the real system to confirm their correctness. Usage is ultimately decided by the customer.